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Old 10-04-17, 11:31 AM   #94
creeky
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I am super pleased to announce the addition of the BMS. This is a simple "active balancing" unit wired here for 12S! Huzzah



JimmyAz. yes. The wiring basically goes as your diagram suggests.

It is a bit of a kludge. However, after over a year in operation it works beautifully. You will be very surprised and pleased with the increase in efficiency going to lithium. Watch your temperatures for long life tho.

I have seen no imbalance of note. The use of the harness increases the durability of the system by tying the cells together. As you note. The new BMS solution improves on this by adding active cell balancing. With the PCB everything is tied together. Its pretty cool. Especially if you look back to where I started.

Personally I prefer the Volt cells. The lifespan looks incredible so far. However the Leaf cells have some nice advantages: they don't need the harness. So you can save a bit of money there. But they also are easier to manage and you can do a more traditional 56v pack quite easily. In my climate they are also rated to charge down to -10C (Celsius). Compared to the Volt packs at 5C and 48v.

The Leaf cells are like hen's teeth tho. I have seen 1. Its in my yard. Pricey but couldn't resist.



I'm not familiar with the XW. Have you updated firmware etc?

I have only done SW installs with Schneider. I haven't had to configure "grid support." So I don't understand why you can't configure say grid support from 42v. Perhaps touch base with Schneider on this issue and report back?
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