Is the Daly BMS trustworthy when it comes its published measurement? #183

M-ax-G · 2024-08-21T11:01:29Z

M-ax-G
Aug 21, 2024

A few days ago I started writing some code to connect via CANbus to a Daly Smart BMS 250 A for my 400 Ah 48 V battery.
Not only does it have a weird CAN protocol, but the data it publishes/provides is all over the shop.

The following listing shows current undulating almost like a sine curve, yet the battery is being discharged at a constant load of 700 W. It event reports charging when this is definitely not the case.

What do other people experience? Seeing this project, I am inclined to ditch my project and adopt this one. However, if this incorrect current reporting is the issue for others, I may well replace this BMS with another brand. BTW: the Bluetooth app shows the same variations, however, its update cycle is slower, hence, the variation is somewhat less strong, compared to the recording below.

Any hints appreciated, thanks.

Ready to query BMS ... v0.1.2
Compiled at: Aug 20 2024, 21:48:52
MsgID 90 sent (1) -->  | 02 | 0F | 00 | 00 | 74 | D9 | 03 | 9F | 527|29913|927 | Battery is discharging | 52.7 V | -8.7 A | 92.7 %
MsgID 90 sent (2) -->  | 02 | 0F | 00 | 00 | 74 | FD | 03 | 9F | 527|29949|927 | Battery is discharging | 52.7 V | -5.1 A | 92.7 %
MsgID 90 sent (3) -->  | 02 | 0F | 00 | 00 | 75 | 1F | 03 | 9F | 527|29983|927 | Battery is discharging | 52.7 V | -1.7 A | 92.7 %
MsgID 90 sent (4) -->  | 02 | 0F | 00 | 00 | 75 | 34 | 03 | 9F | 527|30004|927 | Battery is charging | 52.7 V | 0.4 A | 92.7 %
MsgID 90 sent (5) -->  | 02 | 0F | 00 | 00 | 75 | 3B | 03 | 9F | 527|30011|927 | Battery is charging | 52.7 V | 1.1 A | 92.7 %
MsgID 90 sent (6) -->  | 02 | 0F | 00 | 00 | 75 | 2E | 03 | 9F | 527|29998|927 | Battery is discharging | 52.7 V | -0.2 A | 92.7 %
MsgID 90 sent (7) -->  | 02 | 0F | 00 | 00 | 75 | 16 | 03 | 9F | 527|29974|927 | Battery is discharging | 52.7 V | -2.6 A | 92.7 %
MsgID 90 sent (8) -->  | 02 | 0F | 00 | 00 | 75 | 08 | 03 | 9F | 527|29960|927 | Battery is discharging | 52.7 V | -4.0 A | 92.7 %
MsgID 90 sent (9) -->  | 02 | 0F | 00 | 00 | 74 | FF | 03 | 9F | 527|29951|927 | Battery is discharging | 52.7 V | -4.9 A | 92.7 %
MsgID 90 sent (10) -->  | 02 | 0F | 00 | 00 | 74 | FE | 03 | 9F | 527|29950|927 | Battery is discharging | 52.7 V | -5.0 A | 92.7 %
MsgID 90 sent (11) -->  | 02 | 0F | 00 | 00 | 74 | FC | 03 | 9F | 527|29948|927 | Battery is discharging | 52.7 V | -5.2 A | 92.7 %
MsgID 90 sent (12) -->  | 02 | 0F | 00 | 00 | 74 | FB | 03 | 9F | 527|29947|927 | Battery is discharging | 52.7 V | -5.3 A | 92.7 %
MsgID 90 sent (13) -->  | 02 | 0F | 00 | 00 | 74 | FB | 03 | 9F | 527|29947|927 | Battery is discharging | 52.7 V | -5.3 A | 92.7 %
MsgID 90 sent (14) -->  | 02 | 0F | 00 | 00 | 74 | F3 | 03 | 9F | 527|29939|927 | Battery is discharging | 52.7 V | -6.1 A | 92.7 %
MsgID 90 sent (15) -->  | 02 | 0F | 00 | 00 | 74 | E1 | 03 | 9F | 527|29921|927 | Battery is discharging | 52.7 V | -7.9 A | 92.7 %
MsgID 90 sent (16) -->  | 02 | 0F | 00 | 00 | 74 | CC | 03 | 9F | 527|29900|927 | Battery is discharging | 52.7 V | -10.0 A | 92.7 %
MsgID 90 sent (17) -->  | 02 | 0F | 00 | 00 | 74 | BF | 03 | 9F | 527|29887|927 | Battery is discharging | 52.7 V | -11.3 A | 92.7 %
MsgID 90 sent (18) -->  | 02 | 0F | 00 | 00 | 74 | C4 | 03 | 9F | 527|29892|927 | Battery is discharging | 52.7 V | -10.8 A | 92.7 %
MsgID 90 sent (19) -->  | 02 | 0F | 00 | 00 | 74 | C8 | 03 | 9F | 527|29896|927 | Battery is discharging | 52.7 V | -10.4 A | 92.7 %
MsgID 90 sent (20) -->  | 02 | 0F | 00 | 00 | 74 | C3 | 03 | 9F | 527|29891|927 | Battery is discharging | 52.7 V | -10.9 A | 92.7 %
MsgID 90 sent (21) -->  | 02 | 0F | 00 | 00 | 74 | C7 | 03 | 9F | 527|29895|927 | Battery is discharging | 52.7 V | -10.5 A | 92.7 %
MsgID 90 sent (22) -->  | 02 | 0F | 00 | 00 | 74 | C9 | 03 | 9F | 527|29897|927 | Battery is discharging | 52.7 V | -10.3 A | 92.7 %
MsgID 90 sent (23) -->  | 02 | 0F | 00 | 00 | 74 | CF | 03 | 9F | 527|29903|927 | Battery is discharging | 52.7 V | -9.7 A | 92.7 %
MsgID 90 sent (24) -->  | 02 | 0F | 00 | 00 | 74 | DA | 03 | 9F | 527|29914|927 | Battery is discharging | 52.7 V | -8.6 A | 92.7 %
MsgID 90 sent (25) -->  | 02 | 0F | 00 | 00 | 74 | E3 | 03 | 9F | 527|29923|927 | Battery is discharging | 52.7 V | -7.7 A | 92.7 %
MsgID 90 sent (26) -->  | 02 | 0F | 00 | 00 | 74 | EA | 03 | 9F | 527|29930|927 | Battery is discharging | 52.7 V | -7.0 A | 92.7 %
MsgID 90 sent (27) -->  | 02 | 0F | 00 | 00 | 74 | F9 | 03 | 9F | 527|29945|927 | Battery is discharging | 52.7 V | -5.5 A | 92.7 %
MsgID 90 sent (28) -->  | 02 | 0F | 00 | 00 | 75 | 0F | 03 | 9F | 527|29967|927 | Battery is discharging | 52.7 V | -3.3 A | 92.7 %
MsgID 90 sent (29) -->  | 02 | 0F | 00 | 00 | 75 | 1E | 03 | 9F | 527|29982|927 | Battery is discharging | 52.7 V | -1.8 A | 92.7 %
MsgID 90 sent (30) -->  | 02 | 0F | 00 | 00 | 75 | 2B | 03 | 9F | 527|29995|927 | Battery is discharging | 52.7 V | -0.5 A | 92.7 %
MsgID 90 sent (31) -->  | 02 | 0F | 00 | 00 | 75 | 36 | 03 | 9F | 527|30006|927 | Battery is charging | 52.7 V | 0.6 A | 92.7 %
MsgID 90 sent (32) -->  | 02 | 0F | 00 | 00 | 75 | 3D | 03 | 9F | 527|30013|927 | Battery is charging | 52.7 V | 1.3 A | 92.7 %
MsgID 90 sent (33) -->  | 02 | 0F | 00 | 00 | 75 | 24 | 03 | 9F | 527|29988|927 | Battery is discharging | 52.7 V | -1.2 A | 92.7 %
MsgID 90 sent (34) -->  | 02 | 0F | 00 | 00 | 74 | F8 | 03 | 9F | 527|29944|927 | Battery is discharging | 52.7 V | -5.6 A | 92.7 %
MsgID 90 sent (35) -->  | 02 | 0F | 00 | 00 | 74 | D5 | 03 | 9F | 527|29909|927 | Battery is discharging | 52.7 V | -9.1 A | 92.7 %
MsgID 90 sent (36) -->  | 02 | 0F | 00 | 00 | 74 | BF | 03 | 9F | 527|29887|927 | Battery is discharging | 52.7 V | -11.3 A | 92.7 %
MsgID 90 sent (37) -->  | 02 | 0F | 00 | 00 | 74 | C2 | 03 | 9F | 527|29890|927 | Battery is discharging | 52.7 V | -11.0 A | 92.7 %
MsgID 90 sent (38) -->  | 02 | 0F | 00 | 00 | 74 | CD | 03 | 9F | 527|29901|927 | Battery is discharging | 52.7 V | -9.9 A | 92.7 %
MsgID 90 sent (39) -->  | 02 | 0F | 00 | 00 | 74 | CD | 03 | 9F | 527|29901|927 | Battery is discharging | 52.7 V | -9.9 A | 92.7 %
MsgID 90 sent (40) -->  | 02 | 0F | 00 | 00 | 74 | CC | 03 | 9F | 527|29900|927 | Battery is discharging | 52.7 V | -10.0 A | 92.7 %
MsgID 90 sent (41) -->  | 02 | 0F | 00 | 00 | 74 | CE | 03 | 9F | 527|29902|927 | Battery is discharging | 52.7 V | -9.8 A | 92.7 %
MsgID 90 sent (42) -->  | 02 | 0F | 00 | 00 | 74 | D3 | 03 | 9F | 527|29907|927 | Battery is discharging | 52.7 V | -9.3 A | 92.7 %
MsgID 90 sent (43) -->  | 02 | 0F | 00 | 00 | 74 | D3 | 03 | 9F | 527|29907|927 | Battery is discharging | 52.7 V | -9.3 A | 92.7 %
MsgID 90 sent (44) -->  | 02 | 0F | 00 | 00 | 74 | DC | 03 | 9F | 527|29916|927 | Battery is discharging | 52.7 V | -8.4 A | 92.7 %
MsgID 90 sent (45) -->  | 02 | 0F | 00 | 00 | 74 | E3 | 03 | 9F | 527|29923|927 | Battery is discharging | 52.7 V | -7.7 A | 92.7 %
MsgID 90 sent (46) -->  | 02 | 0F | 00 | 00 | 74 | EB | 03 | 9F | 527|29931|927 | Battery is discharging | 52.7 V | -6.9 A | 92.7 %
MsgID 90 sent (47) -->  | 02 | 0F | 00 | 00 | 74 | F6 | 03 | 9F | 527|29942|927 | Battery is discharging | 52.7 V | -5.8 A | 92.7 %
MsgID 90 sent (48) -->  | 02 | 0F | 00 | 00 | 75 | 03 | 03 | 9F | 527|29955|927 | Battery is discharging | 52.7 V | -4.5 A | 92.7 %
MsgID 90 sent (49) -->  | 02 | 0F | 00 | 00 | 75 | 0E | 03 | 9F | 527|29966|927 | Battery is discharging | 52.7 V | -3.4 A | 92.7 %
MsgID 90 sent (50) -->  | 02 | 0F | 00 | 00 | 75 | 1A | 03 | 9F | 527|29978|927 | Battery is discharging | 52.7 V | -2.2 A | 92.7 %
MsgID 90 sent (51) -->  | 02 | 0F | 00 | 00 | 75 | 21 | 03 | 9F | 527|29985|927 | Battery is discharging | 52.7 V | -1.5 A | 92.7 %
MsgID 90 sent (52) -->  | 02 | 0F | 00 | 00 | 75 | 26 | 03 | 9F | 527|29990|927 | Battery is discharging | 52.7 V | -1.0 A | 92.7 %
MsgID 90 sent (53) -->  | 02 | 0F | 00 | 00 | 75 | 2C | 03 | 9F | 527|29996|927 | Battery is discharging | 52.7 V | -0.4 A | 92.7 %
MsgID 90 sent (54) -->  | 02 | 0F | 00 | 00 | 75 | 31 | 03 | 9F | 527|30001|927 | Battery is charging | 52.7 V | 0.1 A | 92.7 %
MsgID 90 sent (55) -->  | 02 | 0F | 00 | 00 | 75 | 33 | 03 | 9F | 527|30003|927 | Battery is charging | 52.7 V | 0.3 A | 92.7 %
MsgID 90 sent (56) -->  | 02 | 0F | 00 | 00 | 75 | 38 | 03 | 9F | 527|30008|927 | Battery is charging | 52.7 V | 0.8 A | 92.7 %
MsgID 90 sent (57) -->  | 02 | 0F | 00 | 00 | 75 | 38 | 03 | 9F | 527|30008|927 | Battery is charging | 52.7 V | 0.8 A | 92.7 %
MsgID 90 sent (58) -->  | 02 | 0F | 00 | 00 | 75 | 38 | 03 | 9F | 527|30008|927 | Battery is charging | 52.7 V | 0.8 A | 92.7 %
MsgID 90 sent (59) -->  | 02 | 0F | 00 | 00 | 75 | 34 | 03 | 9F | 527|30004|927 | Battery is charging | 52.7 V | 0.4 A | 92.7 %
MsgID 90 sent (60) -->  | 02 | 0F | 00 | 00 | 75 | 36 | 03 | 9F | 527|30006|927 | Battery is charging | 52.7 V | 0.6 A | 92.7 %
MsgID 90 sent (61) -->  | 02 | 0F | 00 | 00 | 75 | 2C | 03 | 9F | 527|29996|927 | Battery is discharging | 52.7 V | -0.4 A | 92.7 %
MsgID 90 sent (62) -->  | 02 | 0F | 00 | 00 | 75 | 1A | 03 | 9F | 527|29978|927 | Battery is discharging | 52.7 V | -2.2 A | 92.7 %
MsgID 90 sent (63) -->  | 02 | 0F | 00 | 00 | 75 | 0A | 03 | 9F | 527|29962|927 | Battery is discharging | 52.7 V | -3.8 A | 92.7 %
MsgID 90 sent (64) -->  | 02 | 0F | 00 | 00 | 74 | F6 | 03 | 9F | 527|29942|927 | Battery is discharging | 52.7 V | -5.8 A | 92.7 %
MsgID 90 sent (65) -->  | 02 | 0F | 00 | 00 | 74 | DD | 03 | 9F | 527|29917|927 | Battery is discharging | 52.7 V | -8.3 A | 92.7 %
MsgID 90 sent (66) -->  | 02 | 0F | 00 | 00 | 74 | C9 | 03 | 9F | 527|29897|927 | Battery is discharging | 52.7 V | -10.3 A | 92.7 %
MsgID 90 sent (67) -->  | 02 | 0F | 00 | 00 | 74 | BA | 03 | 9F | 527|29882|927 | Battery is discharging | 52.7 V | -11.8 A | 92.7 %
MsgID 90 sent (68) -->  | 02 | 0F | 00 | 00 | 74 | C0 | 03 | 9F | 527|29888|927 | Battery is discharging | 52.7 V | -11.2 A | 92.7 %
MsgID 90 sent (69) -->  | 02 | 0F | 00 | 00 | 74 | BD | 03 | 9F | 527|29885|927 | Battery is discharging | 52.7 V | -11.5 A | 92.7 %
MsgID 90 sent (70) -->  | 02 | 0F | 00 | 00 | 74 | BF | 03 | 9F | 527|29887|927 | Battery is discharging | 52.7 V | -11.3 A | 92.7 %
MsgID 90 sent (71) -->  | 02 | 0F | 00 | 00 | 74 | C0 | 03 | 9F | 527|29888|927 | Battery is discharging | 52.7 V | -11.2 A | 92.7 %
MsgID 90 sent (72) -->  | 02 | 0F | 00 | 00 | 74 | C5 | 03 | 9F | 527|29893|927 | Battery is discharging | 52.7 V | -10.7 A | 92.7 %
MsgID 90 sent (73) -->  | 02 | 0F | 00 | 00 | 74 | C6 | 03 | 9F | 527|29894|927 | Battery is discharging | 52.7 V | -10.6 A | 92.7 %
MsgID 90 sent (74) -->  | 02 | 0F | 00 | 00 | 74 | CD | 03 | 9F | 527|29901|927 | Battery is discharging | 52.7 V | -9.9 A | 92.7 %
MsgID 90 sent (75) -->  | 02 | 0F | 00 | 00 | 74 | CD | 03 | 9F | 527|29901|927 | Battery is discharging | 52.7 V | -9.9 A | 92.7 %
MsgID 90 sent (76) -->  | 02 | 0F | 00 | 00 | 74 | CB | 03 | 9F | 527|29899|927 | Battery is discharging | 52.7 V | -10.1 A | 92.7 %
MsgID 90 sent (77) -->  | 02 | 0F | 00 | 00 | 74 | CD | 03 | 9F | 527|29901|927 | Battery is discharging | 52.7 V | -9.9 A | 92.7 %
MsgID 90 sent (78) -->  | 02 | 0F | 00 | 00 | 74 | D7 | 03 | 9F | 527|29911|927 | Battery is discharging | 52.7 V | -8.9 A | 92.7 %
MsgID 90 sent (79) -->  | 02 | 0F | 00 | 00 | 74 | DA | 03 | 9F | 527|29914|927 | Battery is discharging | 52.7 V | -8.6 A | 92.7 %
MsgID 90 sent (80) -->  | 02 | 0F | 00 | 00 | 74 | DB | 03 | 9F | 527|29915|927 | Battery is discharging | 52.7 V | -8.5 A | 92.7 %
MsgID 90 sent (81) -->  | 02 | 0F | 00 | 00 | 74 | E0 | 03 | 9F | 527|29920|927 | Battery is discharging | 52.7 V | -8.0 A | 92.7 %
MsgID 90 sent (82) -->  | 02 | 0F | 00 | 00 | 74 | E0 | 03 | 9F | 527|29920|927 | Battery is discharging | 52.7 V | -8.0 A | 92.7 %
MsgID 90 sent (83) -->  | 02 | 0F | 00 | 00 | 74 | E5 | 03 | 9F | 527|29925|927 | Battery is discharging | 52.7 V | -7.5 A | 92.7 %
MsgID 90 sent (84) -->  | 02 | 0F | 00 | 00 | 74 | E4 | 03 | 9F | 527|29924|927 | Battery is discharging | 52.7 V | -7.6 A | 92.7 %
MsgID 90 sent (85) -->  | 02 | 0F | 00 | 00 | 74 | E6 | 03 | 9F | 527|29926|927 | Battery is discharging | 52.7 V | -7.4 A | 92.7 %
MsgID 90 sent (86) -->  | 02 | 0F | 00 | 00 | 74 | E8 | 03 | 9F | 527|29928|927 | Battery is discharging | 52.7 V | -7.2 A | 92.7 %
MsgID 90 sent (87) -->  | 02 | 0F | 00 | 00 | 74 | EF | 03 | 9F | 527|29935|927 | Battery is discharging | 52.7 V | -6.5 A | 92.7 %
MsgID 90 sent (88) -->  | 02 | 0F | 00 | 00 | 74 | F6 | 03 | 9F | 527|29942|927 | Battery is discharging | 52.7 V | -5.8 A | 92.7 %
MsgID 90 sent (89) -->  | 02 | 0F | 00 | 00 | 74 | FD | 03 | 9F | 527|29949|927 | Battery is discharging | 52.7 V | -5.1 A | 92.7 %
MsgID 90 sent (90) -->  | 02 | 0F | 00 | 00 | 75 | 02 | 03 | 9F | 527|29954|927 | Battery is discharging | 52.7 V | -4.6 A | 92.7 %
MsgID 90 sent (91) -->  | 02 | 0F | 00 | 00 | 75 | 07 | 03 | 9F | 527|29959|927 | Battery is discharging | 52.7 V | -4.1 A | 92.7 %
MsgID 90 sent (92) -->  | 02 | 0F | 00 | 00 | 75 | 11 | 03 | 9F | 527|29969|927 | Battery is discharging | 52.7 V | -3.1 A | 92.7 %
MsgID 90 sent (93) -->  | 02 | 0F | 00 | 00 | 75 | 1E | 03 | 9F | 527|29982|927 | Battery is discharging | 52.7 V | -1.8 A | 92.7 %
MsgID 90 sent (94) -->  | 02 | 0F | 00 | 00 | 75 | 26 | 03 | 9F | 527|29990|927 | Battery is discharging | 52.7 V | -1.0 A | 92.7 %
MsgID 90 sent (95) -->  | 02 | 0F | 00 | 00 | 75 | 2E | 03 | 9F | 527|29998|927 | Battery is discharging | 52.7 V | -0.2 A | 92.7 %
MsgID 90 sent (96) -->  | 02 | 0F | 00 | 00 | 75 | 35 | 03 | 9F | 527|30005|927 | Battery is charging | 52.7 V | 0.5 A | 92.7 %
MsgID 90 sent (97) -->  | 02 | 0F | 00 | 00 | 75 | 38 | 03 | 9F | 527|30008|927 | Battery is charging | 52.7 V | 0.8 A | 92.7 %
MsgID 90 sent (98) -->  | 02 | 0F | 00 | 00 | 75 | 3C | 03 | 9F | 527|30012|927 | Battery is charging | 52.7 V | 1.2 A | 92.7 %
MsgID 90 sent (99) -->  | 02 | 0F | 00 | 00 | 75 | 3B | 03 | 9F | 527|30011|927 | Battery is charging | 52.7 V | 1.1 A | 92.7 %
MsgID 90 sent (100) -->  | 02 | 0F | 00 | 00 | 75 | 30 | 03 | 9F | 527|30000|927 | Battery is discharging | 52.7 V | 0.0 A | 92.7 %
MsgID 90 sent (101) -->  | 02 | 0F | 00 | 00 | 75 | 2B | 03 | 9F | 527|29995|927 | Battery is discharging | 52.7 V | -0.5 A | 92.7 %
MsgID 90 sent (102) -->  | 02 | 0F | 00 | 00 | 75 | 1C | 03 | 9F | 527|29980|927 | Battery is discharging | 52.7 V | -2.0 A | 92.7 %
MsgID 90 sent (103) -->  | 02 | 0F | 00 | 00 | 75 | 15 | 03 | 9F | 527|29973|927 | Battery is discharging | 52.7 V | -2.7 A | 92.7 %
MsgID 90 sent (104) -->  | 02 | 0F | 00 | 00 | 75 | 0E | 03 | 9F | 527|29966|927 | Battery is discharging | 52.7 V | -3.4 A | 92.7 %
MsgID 90 sent (105) -->  | 02 | 0F | 00 | 00 | 75 | 03 | 03 | 9F | 527|29955|927 | Battery is discharging | 52.7 V | -4.5 A | 92.7 %
MsgID 90 sent (106) -->  | 02 | 0F | 00 | 00 | 74 | FA | 03 | 9F | 527|29946|927 | Battery is discharging | 52.7 V | -5.4 A | 92.7 %
MsgID 90 sent (107) -->  | 02 | 0F | 00 | 00 | 74 | EB | 03 | 9F | 527|29931|927 | Battery is discharging | 52.7 V | -6.9 A | 92.7 %
MsgID 90 sent (108) -->  | 02 | 0F | 00 | 00 | 74 | E0 | 03 | 9F | 527|29920|927 | Battery is discharging | 52.7 V | -8.0 A | 92.7 %
MsgID 90 sent (109) -->  | 02 | 0F | 00 | 00 | 74 | D0 | 03 | 9F | 527|29904|927 | Battery is discharging | 52.7 V | -9.6 A | 92.7 %
MsgID 90 sent (110) -->  | 02 | 0F | 00 | 00 | 74 | C2 | 03 | 9F | 527|29890|927 | Battery is discharging | 52.7 V | -11.0 A | 92.7 %
MsgID 90 sent (111) -->  | 02 | 0F | 00 | 00 | 74 | C1 | 03 | 9F | 527|29889|927 | Battery is discharging | 52.7 V | -11.1 A | 92.7 %
MsgID 90 sent (112) -->  | 02 | 0F | 00 | 00 | 74 | C1 | 03 | 9F | 527|29889|927 | Battery is discharging | 52.7 V | -11.1 A | 92.7 %
MsgID 90 sent (113) -->  | 02 | 0F | 00 | 00 | 74 | C6 | 03 | 9F | 527|29894|927 | Battery is discharging | 52.7 V | -10.6 A | 92.7 %
MsgID 90 sent (114) -->  | 02 | 0F | 00 | 00 | 74 | C8 | 03 | 9F | 527|29896|927 | Battery is discharging | 52.7 V | -10.4 A | 92.7 %
MsgID 90 sent (115) -->  | 02 | 0F | 00 | 00 | 74 | C5 | 03 | 9F | 527|29893|927 | Battery is discharging | 52.7 V | -10.7 A | 92.7 %
MsgID 90 sent (116) -->  | 02 | 0F | 00 | 00 | 74 | C4 | 03 | 9F | 527|29892|927 | Battery is discharging | 52.7 V | -10.8 A | 92.7 %
MsgID 90 sent (117) -->  | 02 | 0F | 00 | 00 | 74 | C4 | 03 | 9F | 527|29892|927 | Battery is discharging | 52.7 V | -10.8 A | 92.7 %
MsgID 90 sent (118) -->  | 02 | 0F | 00 | 00 | 74 | CE | 03 | 9F | 527|29902|927 | Battery is discharging | 52.7 V | -9.8 A | 92.7 %
MsgID 90 sent (119) -->  | 02 | 0F | 00 | 00 | 74 | CB | 03 | 9F | 527|29899|927 | Battery is discharging | 52.7 V | -10.1 A | 92.7 %
MsgID 90 sent (120) -->  | 02 | 0F | 00 | 00 | 74 | CE | 03 | 9F | 527|29902|927 | Battery is discharging | 52.7 V | -9.8 A | 92.7 %
MsgID 90 sent (121) -->  | 02 | 0F | 00 | 00 | 74 | D9 | 03 | 9F | 527|29913|927 | Battery is discharging | 52.7 V | -8.7 A | 92.7 %
MsgID 90 sent (122) -->  | 02 | 0F | 00 | 00 | 74 | F0 | 03 | 9F | 527|29936|927 | Battery is discharging | 52.7 V | -6.4 A | 92.7 %
MsgID 90 sent (123) -->  | 02 | 0F | 00 | 00 | 75 | 0C | 03 | 9F | 527|29964|927 | Battery is discharging | 52.7 V | -3.6 A | 92.7 %
MsgID 90 sent (124) -->  | 02 | 0F | 00 | 00 | 75 | 22 | 03 | 9F | 527|29986|927 | Battery is discharging | 52.7 V | -1.4 A | 92.7 %
MsgID 90 sent (125) -->  | 02 | 0F | 00 | 00 | 75 | 2E | 03 | 9F | 527|29998|927 | Battery is discharging | 52.7 V | -0.2 A | 92.7 %
MsgID 90 sent (126) -->  | 02 | 0F | 00 | 00 | 75 | 3A | 03 | 9F | 527|30010|927 | Battery is charging | 52.7 V | 1.0 A | 92.7 %
MsgID 90 sent (127) -->  | 02 | 0F | 00 | 00 | 75 | 3C | 03 | 9F | 527|30012|927 | Battery is charging | 52.7 V | 1.2 A | 92.7 %
MsgID 90 sent (128) -->  | 02 | 0F | 00 | 00 | 75 | 2A | 03 | 9F | 527|29994|927 | Battery is discharging | 52.7 V | -0.6 A | 92.7 %
MsgID 90 sent (129) -->  | 02 | 0F | 00 | 00 | 75 | 05 | 03 | 9F | 527|29957|927 | Battery is discharging | 52.7 V | -4.3 A | 92.7 %
MsgID 90 sent (130) -->  | 02 | 0F | 00 | 00 | 74 | DE | 03 | 9F | 527|29918|927 | Battery is discharging | 52.7 V | -8.2 A | 92.7 %
MsgID 90 sent (131) -->  | 02 | 0F | 00 | 00 | 74 | C2 | 03 | 9F | 527|29890|927 | Battery is discharging | 52.7 V | -11.0 A | 92.7 %
MsgID 90 sent (132) -->  | 02 | 0F | 00 | 00 | 74 | BD | 03 | 9F | 527|29885|927 | Battery is discharging | 52.7 V | -11.5 A | 92.7 %
MsgID 90 sent (133) -->  | 02 | 0F | 00 | 00 | 74 | CA | 03 | 9F | 527|29898|927 | Battery is discharging | 52.7 V | -10.2 A | 92.7 %
MsgID 90 sent (134) -->  | 02 | 0F | 00 | 00 | 74 | D2 | 03 | 9F | 527|29906|927 | Battery is discharging | 52.7 V | -9.4 A | 92.7 %
MsgID 90 sent (135) -->  | 02 | 0F | 00 | 00 | 74 | E8 | 03 | 9F | 527|29928|927 | Battery is discharging | 52.7 V | -7.2 A | 92.7 %
MsgID 90 sent (136) -->  | 02 | 0F | 00 | 00 | 75 | 0C | 03 | 9F | 527|29964|927 | Battery is discharging | 52.7 V | -3.6 A | 92.7 %
MsgID 90 sent (137) -->  | 02 | 0F | 00 | 00 | 75 | 2A | 03 | 9F | 527|29994|927 | Battery is discharging | 52.7 V | -0.6 A | 92.7 %
MsgID 90 sent (138) -->  | 02 | 0F | 00 | 00 | 75 | 3A | 03 | 9F | 527|30010|927 | Battery is charging | 52.7 V | 1.0 A | 92.7 %
MsgID 90 sent (139) -->  | 02 | 0F | 00 | 00 | 75 | 30 | 03 | 9F | 527|30000|927 | Battery is discharging | 52.7 V | 0.0 A | 92.7 %
MsgID 90 sent (140) -->  | 02 | 0F | 00 | 00 | 74 | FE | 03 | 9F | 527|29950|927 | Battery is discharging | 52.7 V | -5.0 A | 92.7 %
MsgID 90 sent (141) -->  | 02 | 0F | 00 | 00 | 74 | CB | 03 | 9F | 527|29899|927 | Battery is discharging | 52.7 V | -10.1 A | 92.7 %
MsgID 90 sent (142) -->  | 02 | 0F | 00 | 00 | 74 | C4 | 03 | 9F | 527|29892|927 | Battery is discharging | 52.7 V | -10.8 A | 92.7 %
MsgID 90 sent (143) -->  | 02 | 0F | 00 | 00 | 74 | C9 | 03 | 9F | 527|29897|927 | Battery is discharging | 52.7 V | -10.3 A | 92.7 %
MsgID 90 sent (144) -->  | 02 | 0F | 00 | 00 | 74 | CF | 03 | 9F | 527|29903|927 | Battery is discharging | 52.7 V | -9.7 A | 92.7 %
MsgID 90 sent (145) -->  | 02 | 0F | 00 | 00 | 74 | D1 | 03 | 9F | 527|29905|927 | Battery is discharging | 52.7 V | -9.5 A | 92.7 %
MsgID 90 sent (146) -->  | 02 | 0F | 00 | 00 | 74 | D3 | 03 | 9F | 527|29907|927 | Battery is discharging | 52.7 V | -9.3 A | 92.7 %
MsgID 90 sent (147) -->  | 02 | 0F | 00 | 00 | 74 | DE | 03 | 9F | 527|29918|927 | Battery is discharging | 52.7 V | -8.2 A | 92.7 %
MsgID 90 sent (148) -->  | 02 | 0F | 00 | 00 | 74 | E8 | 03 | 9F | 527|29928|927 | Battery is discharging | 52.7 V | -7.2 A | 92.7 %
MsgID 90 sent (149) -->  | 02 | 0F | 00 | 00 | 74 | F7 | 03 | 9F | 527|29943|927 | Battery is discharging | 52.7 V | -5.7 A | 92.7 %
MsgID 90 sent (150) -->  | 02 | 0F | 00 | 00 | 75 | 06 | 03 | 9F | 527|29958|927 | Battery is discharging | 52.7 V | -4.2 A | 92.7 %
MsgID 90 sent (151) -->  | 02 | 0F | 00 | 00 | 75 | 19 | 03 | 9F | 527|29977|927 | Battery is discharging | 52.7 V | -2.3 A | 92.7 %
MsgID 90 sent (152) -->  | 02 | 0F | 00 | 00 | 75 | 27 | 03 | 9F | 527|29991|927 | Battery is discharging | 52.7 V | -0.9 A | 92.7 %
MsgID 90 sent (153) -->  | 02 | 0F | 00 | 00 | 75 | 31 | 03 | 9F | 527|30001|927 | Battery is charging | 52.7 V | 0.1 A | 92.7 %
MsgID 90 sent (154) -->  | 02 | 0F | 00 | 00 | 75 | 39 | 03 | 9F | 527|30009|927 | Battery is charging | 52.7 V | 0.9 A | 92.7 %
MsgID 90 sent (155) -->  | 02 | 0F | 00 | 00 | 75 | 3B | 03 | 9F | 527|30011|927 | Battery is charging | 52.7 V | 1.1 A | 92.7 %
MsgID 90 sent (156) -->  | 02 | 0F | 00 | 00 | 75 | 23 | 03 | 9F | 527|29987|927 | Battery is discharging | 52.7 V | -1.3 A | 92.7 %
MsgID 90 sent (157) -->  | 02 | 0F | 00 | 00 | 74 | F5 | 03 | 9F | 527|29941|927 | Battery is discharging | 52.7 V | -5.9 A | 92.7 %
MsgID 90 sent (158) -->  | 02 | 0F | 00 | 00 | 74 | C9 | 03 | 9F | 527|29897|927 | Battery is discharging | 52.7 V | -10.3 A | 92.7 %
MsgID 90 sent (159) -->  | 02 | 0F | 00 | 00 | 74 | BE | 03 | 9F | 527|29886|927 | Battery is discharging | 52.7 V | -11.4 A | 92.7 %
MsgID 90 sent (160) -->  | 02 | 0F | 00 | 00 | 74 | C9 | 03 | 9F | 527|29897|927 | Battery is discharging | 52.7 V | -10.3 A | 92.7 %
MsgID 90 sent (161) -->  | 02 | 0F | 00 | 00 | 74 | E7 | 03 | 9F | 527|29927|927 | Battery is discharging | 52.7 V | -7.3 A | 92.7 %
MsgID 90 sent (162) -->  | 02 | 0F | 00 | 00 | 75 | 14 | 03 | 9F | 527|29972|927 | Battery is discharging | 52.7 V | -2.8 A | 92.7 %
MsgID 90 sent (163) -->  | 02 | 0F | 00 | 00 | 75 | 2E | 03 | 9F | 527|29998|927 | Battery is discharging | 52.7 V | -0.2 A | 92.7 %
MsgID 90 sent (164) -->  | 02 | 0F | 00 | 00 | 75 | 38 | 03 | 9F | 527|30008|927 | Battery is charging | 52.7 V | 0.8 A | 92.7 %
MsgID 90 sent (165) -->  | 02 | 0F | 00 | 00 | 75 | 21 | 03 | 9F | 527|29985|927 | Battery is discharging | 52.7 V | -1.5 A | 92.7 %
MsgID 90 sent (166) -->  | 02 | 0F | 00 | 00 | 74 | EC | 03 | 9F | 527|29932|927 | Battery is discharging | 52.7 V | -6.8 A | 92.7 %
MsgID 90 sent (167) -->  | 02 | 0F | 00 | 00 | 74 | BE | 03 | 9F | 527|29886|927 | Battery is discharging | 52.7 V | -11.4 A | 92.7 %
MsgID 90 sent (168) -->  | 02 | 0F | 00 | 00 | 74 | BE | 03 | 9F | 527|29886|927 | Battery is discharging | 52.7 V | -11.4 A | 92.7 %
MsgID 90 sent (169) -->  | 02 | 0F | 00 | 00 | 74 | C9 | 03 | 9F | 527|29897|927 | Battery is discharging | 52.7 V | -10.3 A | 92.7 %

The following graph shows current over 20 minutes and 1850 data points; weird indeed; actually it is unusable.

softwarecrash · 2024-08-22T08:46:42Z

softwarecrash
Aug 22, 2024
Maintainer

have you connected a inverter or something else?
or it is only a static load like a light bulb without any electronic?

11 replies

M-ax-G Aug 23, 2024
Author

Alright, the tests are in, and you are correct... a pure DC load, in this case 3 x 12 V light globes and one 10 Ohm 100W resistor in series produced this result:

77285 | MsgID 90 sent (77) -->  | 02 | 1F | 00 | 00 | 75 | 30 | 03 | DB | 543|30000|987 | Battery is discharging | 54.3 V | 0.0 A | 98.7 %
78295 | MsgID 90 sent (78) -->  | 02 | 1F | 00 | 00 | 75 | 30 | 03 | DB | 543|30000|987 | Battery is discharging | 54.3 V | 0.0 A | 98.7 %
79304 | MsgID 90 sent (79) -->  | 02 | 1F | 00 | 00 | 75 | 30 | 03 | DB | 543|30000|987 | Battery is discharging | 54.3 V | 0.0 A | 98.7 %
80315 | MsgID 90 sent (80) -->  | 02 | 1F | 00 | 00 | 75 | 30 | 03 | DB | 543|30000|987 | Battery is discharging | 54.3 V | 0.0 A | 98.7 %
81325 | MsgID 90 sent (81) -->  | 02 | 1F | 00 | 00 | 75 | 30 | 03 | DB | 543|30000|987 | Battery is discharging | 54.3 V | 0.0 A | 98.7 %
82335 | MsgID 90 sent (82) -->  | 02 | 1F | 00 | 00 | 75 | 30 | 03 | DB | 543|30000|987 | Battery is discharging | 54.3 V | 0.0 A | 98.7 %
83345 | MsgID 90 sent (83) -->  | 02 | 1F | 00 | 00 | 75 | 30 | 03 | DB | 543|30000|987 | Battery is discharging | 54.3 V | 0.0 A | 98.7 %
84356 | MsgID 90 sent (84) -->  | 02 | 1E | 00 | 00 | 75 | 18 | 03 | DB | 542|29976|987 | Battery is discharging | 54.2 V | -2.4 A | 98.7 %
85365 | MsgID 90 sent (85) -->  | 02 | 1E | 00 | 00 | 75 | 08 | 03 | DB | 542|29960|987 | Battery is discharging | 54.2 V | -4.0 A | 98.7 %
86376 | MsgID 90 sent (86) -->  | 02 | 1E | 00 | 00 | 75 | 0D | 03 | DB | 542|29965|987 | Battery is discharging | 54.2 V | -3.5 A | 98.7 %
87386 | MsgID 90 sent (87) -->  | 02 | 1E | 00 | 00 | 75 | 0E | 03 | DB | 542|29966|987 | Battery is discharging | 54.2 V | -3.4 A | 98.7 %
88396 | MsgID 90 sent (88) -->  | 02 | 1E | 00 | 00 | 75 | 0F | 03 | DB | 542|29967|987 | Battery is discharging | 54.2 V | -3.3 A | 98.7 %
89406 | MsgID 90 sent (89) -->  | 02 | 1E | 00 | 00 | 75 | 0E | 03 | DB | 542|29966|987 | Battery is discharging | 54.2 V | -3.4 A | 98.7 %
90416 | MsgID 90 sent (90) -->  | 02 | 1E | 00 | 00 | 75 | 0E | 03 | DB | 542|29966|987 | Battery is discharging | 54.2 V | -3.4 A | 98.7 %
91426 | MsgID 90 sent (91) -->  | 02 | 1E | 00 | 00 | 75 | 0E | 03 | DB | 542|29966|987 | Battery is discharging | 54.2 V | -3.4 A | 98.7 %
92436 | MsgID 90 sent (92) -->  | 02 | 1E | 00 | 00 | 75 | 0E | 03 | DB | 542|29966|987 | Battery is discharging | 54.2 V | -3.4 A | 98.7 %
93447 | MsgID 90 sent (93) -->  | 02 | 1E | 00 | 00 | 75 | 0E | 03 | DB | 542|29966|987 | Battery is discharging | 54.2 V | -3.4 A | 98.7 %
94456 | MsgID 90 sent (94) -->  | 02 | 1E | 00 | 00 | 75 | 0E | 03 | DB | 542|29966|987 | Battery is discharging | 54.2 V | -3.4 A | 98.7 %
95467 | MsgID 90 sent (95) -->  | 02 | 1E | 00 | 00 | 75 | 2A | 03 | DB | 542|29994|987 | Battery is discharging | 54.2 V | -0.6 A | 98.7 %
96477 | MsgID 90 sent (96) -->  | 02 | 1E | 00 | 00 | 75 | 30 | 03 | DB | 542|30000|987 | Battery is discharging | 54.2 V | 0.0 A | 98.7 %
97486 | MsgID 90 sent (97) -->  | 02 | 1E | 00 | 00 | 75 | 30 | 03 | DB | 542|30000|987 | Battery is discharging | 54.2 V | 0.0 A | 98.7 %
98497 | MsgID 90 sent (98) -->  | 02 | 1E | 00 | 00 | 75 | 30 | 03 | DB | 542|30000|987 | Battery is discharging | 54.2 V | 0.0 A | 98.7 %
99507 | MsgID 90 sent (99) -->  | 02 | 1E | 00 | 00 | 75 | 30 | 03 | DB | 542|30000|987 | Battery is discharging | 54.2 V | 0.0 A | 98.7 %

The 0 A is when the battery, or rather the BMS negative is removed from the inverter-charger.
The Amps shown are with the resistance connected. Ignore the first two values, connecting during a measurement cycle, the next globes heating up, then reducing their resistance slightly, staying constant on -3.4 A. Last measurement taking the connection off during the measurement cycle, thus reporting less.

I didn't run this longer, as the result is clear; silly me blew the 4th bulb, acting as a fuse for the others, as they did not like to be connected to 54 V with 4 x 12 V in series; hence, the 100 W resistor I could find and add; however, it got hot darn quick. :D

As a result some math needs to be employed to fix this wobble business.

Thank you for your feedback.

BTW: what is considered a quality BMS, ideally provinding a smooth current value?

softwarecrash Aug 23, 2024
Maintainer

ah great, thank you.
so what we can do?

make a filter by your control system/smart system, like median calculator or a pop-array what shift in the last value and get the middle value from like 5 or 10 values. or something else calculated
i can try build in a function that calculate this, so badly im not the mathematican wizzard, and this calculation is not so exact, the data will recorded and calculated so the data is smooth but is not realtime.
im open for ideas to improve this thing

mt-mrx Aug 23, 2024

Hi,

I see an issue with doing some kind of averaging in the control/smart system. In my case I have the Wemos set to a reporting interval of 30 seconds, of course I could average over those data points but having more point gives a "better" average.

I believe you mentioned before (in one of the bug tickets) that your code get's data a lot more often than that from the BMS.
Is the BMS actively sending those values or are you polling it and which interval is it?

M-ax-G Aug 23, 2024
Author

The 1,800 data points I have in my O.P. have a 1 second interval. I have to median 15 values to arrive at a reasonable result. Looking at this graph again, I see more clearly a variation in 'wobble' frequency, which must be related to the 'dirty' consumers I have. I can say for sure that I have a lot of them; many little switching power supplies for controllers,, a fridge/freezer with a scroller, computers, displays, and the list goes on. :)

softwarecrash Aug 23, 2024
Maintainer

Hi,

I see an issue with doing some kind of averaging in the control/smart system. In my case I have the Wemos set to a reporting interval of 30 seconds, of course I could average over those data points but having more point gives a "better" average.

I believe you mentioned before (in one of the bug tickets) that your code get's data a lot more often than that from the BMS. Is the BMS actively sending those values or are you polling it and which interval is it?

its a polling function, the code loops the workers, every time the worker gets firered (about 400-900ms related to the rest what todo) it cn get new data

mt-mrx · 2024-08-22T09:26:50Z

mt-mrx
Aug 22, 2024

I have a 60A Daly BMS with a small 15S 48V battery and a HM300 inverter connected. Here an example how the power values reported as "Pack Power" from the BMS look like versus the DC power reported by the HM300 via OpenDTU.

2 replies

M-ax-G Aug 23, 2024
Author

How can anyone use this Daly output to control something?! It's useless, even if the Daly data is absolutely accurate.

Tomashaglund1 Jul 21, 2025

Here's also with reference to esphome-jk-bms comparing direct to daly2mqtt.

Setup
1 x 16 x 315Ah LFP (parallel)
1 x 16 x 305AH LFP (parallel)
1 x Victron MP2 48/3000 GX

Comparing the JK reported values vs. daly2mqtt there's a big difference (picture below) they should in theory (+/- <1%) be the same.
Would be neat as previously mentioned if we could say sum the average during last 2s divide by sample taken and get that as an output?

Uh oh!

Is the Daly BMS trustworthy when it comes its published measurement? #183

Uh oh!

Uh oh!

M-ax-G Aug 21, 2024

Replies: 2 comments · 13 replies

Uh oh!

softwarecrash Aug 22, 2024 Maintainer

Uh oh!

M-ax-G Aug 23, 2024 Author

Uh oh!

softwarecrash Aug 23, 2024 Maintainer

Uh oh!

mt-mrx Aug 23, 2024

Uh oh!

M-ax-G Aug 23, 2024 Author

Uh oh!

softwarecrash Aug 23, 2024 Maintainer

Uh oh!

mt-mrx Aug 22, 2024

Uh oh!

M-ax-G Aug 23, 2024 Author

Uh oh!

Tomashaglund1 Jul 21, 2025

M-ax-G
Aug 21, 2024

Replies: 2 comments 13 replies

softwarecrash
Aug 22, 2024
Maintainer

M-ax-G Aug 23, 2024
Author

softwarecrash Aug 23, 2024
Maintainer

M-ax-G Aug 23, 2024
Author

softwarecrash Aug 23, 2024
Maintainer

mt-mrx
Aug 22, 2024

M-ax-G Aug 23, 2024
Author