This question has me thinking about expanding a backup system based around an SOK, or any other similar battery such as an EG4 that has a built in BMS with communication. Most of those units can be paralleled together for increased capacity. My question is this: if you have just (1) of those units hooked up and communicating with an inverter, could you expand the capacity of that system by adding a DIY battery bank in parallel? Assume for this scenario that the added DIY unit had the same cells, and same capacity. Or, what if the added DIY unit had larger capacity, but the same type cells?
We have NEC 2020 here, and that process requires you to state in your application if a battery will be used. Our AHJ insists that everything is UL listed, or NRTL. For those of us that have a large investment in automotive cells, or just enjoy building their own batteries, this places a serious crimp on our ability to afford to expand a legal, permitted system. I don't want to get into a discussion arguing about the regulations, but that is the way it is ENFORCED here. I'm more concerned with changes taking place with home insurance companies, who are doing their best to limit claims, or just find any possible excuse to deny a claim.
So, could a person purchase a code compliant battery, install it, and then add an "expansion" unit that is DIY? Set aside the issue of the second unit being DIY, is certainly not UL listed. I'm asking for the simple reason that I don't know if it would work properly.
I'm selling off my batteries to people who are not regulated by NEC 2020, or are building EV conversions. My sister has a remote cabin, and she will be getting a nice bank for free...
Inquiring minds want to know....
We have NEC 2020 here, and that process requires you to state in your application if a battery will be used. Our AHJ insists that everything is UL listed, or NRTL. For those of us that have a large investment in automotive cells, or just enjoy building their own batteries, this places a serious crimp on our ability to afford to expand a legal, permitted system. I don't want to get into a discussion arguing about the regulations, but that is the way it is ENFORCED here. I'm more concerned with changes taking place with home insurance companies, who are doing their best to limit claims, or just find any possible excuse to deny a claim.
So, could a person purchase a code compliant battery, install it, and then add an "expansion" unit that is DIY? Set aside the issue of the second unit being DIY, is certainly not UL listed. I'm asking for the simple reason that I don't know if it would work properly.
I'm selling off my batteries to people who are not regulated by NEC 2020, or are building EV conversions. My sister has a remote cabin, and she will be getting a nice bank for free...
Inquiring minds want to know....