Quote:
Originally Posted by creeky
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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Thank you so much for your fast reply.
I am surprised that even without each cells tied together, they still stay in balance very well. If the cells are tied together, I think it can do without BMS.
I have always thought the Volt and Leaf shared the same lithium chemistry? But you're saying they are different and the Volt supposed to have more life cycle?
It just hit me that the Volt is actually a Hybrid and not a fully electric car? I always thought it was all electric? If this is the case, is it safe to say that a 30k miles Volt battery have less cycle than the 30k miles Leaf? Because the Leaf run purely on battery and would use more cycle quicker than the Volt? All of the 2013-2015 Volt has a 18kw pack right?
As for the Conext XW vs SW, they both share the same setup when it come to the grid support mode. The inverter software simply WILL not let you set the grid support voltage below 47volts. Also I am pretty sure Schneider wouldn't even bother looking into making any changes, they are just not like those small company who actually listen to consumer. (long story how I know).
Could you please tell me how much of a voltage drop on your 13kw packs if you were to pull like 2000-3000watts? If the pack is at, let say 80-85% capacity, which is like 4.0v per cells and at what SOC would it be when it's at about 47volts? This will tell me if the 47volts cut off for grid support is possible.
I am sorry for so many questions, but you may be the only one who can answer all these question and I am sure it would be helpful for others who ran across this thread like I am.
THANKS!