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Pat911 · 11-08-2022, 04:09 PM

So the b- on the shunt is connected to the negative of one battery only and the negatives of the other batteries are connected to the p- of the shunt, effectively bypassing the shunt for those 5 batteries?

That’s the only way configuring with 18Ah will work. That is definitely the wrong way to configure it. Since the shunt is a low value resistor, the battery it is connected to will see less load than the other 5 batteries because it now has a higher cable resistance due to the added shunt. The current drawn will not be shared equally between batteries.

Are you able to rewire it as per the diagram above?

11-08-2022, 04:09 PM	#46
Pat911 Gone Wild Join Date: Dec 2020 Location: Melbourne, Australia Posts: 1,948	Re: Battery bms shutoff So the b- on the shunt is connected to the negative of one battery only and the negatives of the other batteries are connected to the p- of the shunt, effectively bypassing the shunt for those 5 batteries? That’s the only way configuring with 18Ah will work. That is definitely the wrong way to configure it. Since the shunt is a low value resistor, the battery it is connected to will see less load than the other 5 batteries because it now has a higher cable resistance due to the added shunt. The current drawn will not be shared equally between batteries. Are you able to rewire it as per the diagram above?