What is the sequence of BMS wiring?
BMS fisrt connection, cables order question - Endless Sphere
My guess is that the recommended cells for using in this kit are ones rated closer to mAh with a 5 amp Maximum Continuous Discharge rating. Your 13S6P 20A kit isn't designed for use with VTC6 cells having a MCD rating of 15amps; ESPECIALLY if the Controller you are using is rated at more than 20amps. The amp rating for determining the correct sized BMS is determined by the amp rating of your Controller (and wattage rating of the Motor). As a general rule the BMS should be rated at least 10amps more than that of the Controllers' amp rating.
Assume you let your pack rest over the past few days? So let us know what's the current voltage readings between the following battery tabs ...
B- to B1 = _.__v
B1 to B2 = _.__v
B2 to B3 = _.__v
B3 to B4 = _.__v
B4 to B5 = _.__v
B5 to B6 = _.__v
B6 to B7 = _.__v
B7 to B8 = _.__v
B8 to B9 = _.__v
B9 to B10 = _.__v
B10 to B11 = _.__v
B11 to B12 = _.__v
B12 to B+ = _.__v
Hopefully, the variance between these 13 parallel lines is no more than 0.10V (100mV). Ideally with brand name new VTC6 cells no more variance than 0.03V (30mV) after your first few discharges and charging again to 53.3V ... 4.10V(avg) x 13.
That's a variance of: 4.17V - 3.99V = 0.18V (180mV) ... too much variance for brand new (fresh) VTC6 cells.General_Lee said:
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Using fresh new VTC6 cells there shouldn't be that much variance (180mV). IMO the degree of variance that you measured is not due to the BMS. More likely some of the 156 spot-welded cells (neg & positive ends) didn't make GOOD contact with the bus bar strips or some of cells may have been slightly damaged during spot-welding.
Is this your first build using a spot-welder?
What spot-welder did you use?
How's it going? This looks to be the ebay kit you purchased ...My guess is that the recommended cells for using in this kit are ones rated closer to mAh with a 5 amp Maximum Continuous Discharge rating. Your 13S6P 20A kit isn't designed for use with VTC6 cells having a MCD rating of 15amps; ESPECIALLY if the Controller you are using is rated at more than 20amps. The amp rating for determining the correct sized BMS is determined by the amp rating of your Controller (and wattage rating of the Motor). As a general rule the BMS should be rated at least 10amps more than that of the Controllers' amp rating.Assume you let your pack rest over the past few days? So let us know what's the current voltage readings between the following battery tabs ...B- to B1 = _.__vB1 to B2 = _.__vB2 to B3 = _.__vB3 to B4 = _.__vB4 to B5 = _.__vB5 to B6 = _.__vB6 to B7 = _.__vB7 to B8 = _.__vB8 to B9 = _.__vB9 to B10 = _.__vB10 to B11 = _.__vB11 to B12 = _.__vB12 to B+ = _.__vHopefully, the variance between these 13 parallel lines is no more than 0.10V (100mV). Ideally with brand name new VTC6 cells no more variance than 0.03V (30mV) after your first few discharges and charging again to 53.3V ... 4.10V(avg) x 13.That's a variance of: 4.17V - 3.99V = 0.18V (180mV) ... too much variance for brand new (fresh) VTC6 cells.Using fresh new VTC6 cells there shouldn't be that much variance (180mV). IMO the degree of variance that you measured is not due to the BMS. More likely some of the 156 spot-welded cells (neg & positive ends) didn't make GOOD contact with the bus bar strips or some of cells may have been slightly damaged during spot-welding.Is this your first build using a spot-welder?What spot-welder did you use?
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BMS's Wiring installation sequence?
Anwser:Always follow a strict sequence when wiring up the BMS. Install or solder B- and P- first, then B+ and P+, when the BMS system is powered up. Then simply plug in the battery sampling wires from B0 to B16 in descending order. Note that no load or charger can be added until all
connections have been installed. The order of removal is reversed: unplug the charger or load first, then remove the battery sampling cable connectors from B16 to B0 in ascending order, then B+, P+ and finally B-, P-.
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