I'm looking for some guidance on how to balance the battery cells for my EG4 Wall Mount. I've heard that I should put it on lead acid settings and adjust the voltages, then perform a 7x drain and charge cycle. Is that true, or is there a better method?
3 Answers
I’m not sure exactly how their BMS works, but the balancer should activate if any cells exceed 3.4V (which equals about 54.4V total). So as long as you’re charging to above that, it should keep things balanced naturally.
To balance the batteries, it’s best to charge each one individually until they’re all at 100%. You don’t actually need to go through draining and recharging them multiple times. Just make sure they have similar voltages (within 0.5V is ideal) when you connect them in parallel. And don’t forget, these are LFP batteries, so get an LFP-specific charger!
It's important to note that you should never charge LFP batteries using lead acid charger settings. The charging process for lead acid and LFP batteries is completely different. The EG4 setup you mentioned likely has a built-in BMS that manages cell balancing for you, so you don’t need to stress about that. Instead, what’s usually recommended is to run a few full charge and discharge cycles to help the BMS get calibrated correctly for accurate state of charge readings.
Thanks for the info! I’m glad I posed the question here.
I heard that from the signature solar tech support too, but it seems risky. I appreciate you clarifying this!