Why doesn't my daly smart bms start balancing?

halibut58 said:

There is a trick to turn on the balancer all the time:

There is a hidden parameter available in sinowealth called ‘Balance open current’ that must be changed to 0 (or even negative) if you want to balance at low or zero current. It was set to 30mA on mine. Changing this to 0 will give you maximum balance time. This parameter kind of acts like a balance enable switch.

Unfortunately the balance on Daly is a very small current (the advertised value of 30-35mA appears to be a peak current, with an average current much less), so the more time you can spend balancing the better….. With this setting, the Daly will even balance after high voltage disconnect before the mosfet turns back on, which will maximize your balance time.

I use ‘Balance voltage’ parameter of 3.4V – meaning that the balance will turn off below this voltage and all is well. I use a ‘balance voltage difference’ of .005V.

While you are in there set ‘DfilterCur’ to 200mA or something reasonable. Any current below this value will be changed to (and displayed as) 0. Note that this parameter is the primary reason why the ‘Balance open current’ acts like an on-off switch for balance.

Why Daly would ship their BMS with these settings is a mystery to me.

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