mcorner
New Member
- Joined
- Sep 10, 2022
- Messages
- 4
I am in MA and am looking to install whole house battery backup and 25kW of solar. I have an installer doing the actual install, but he is pretty close to DIY and the design is a collaborative process.
background: In MA the law recently changed (and the DPU is catching up) to allow up to 25kW of inverter capacity on single phase service with full net metering. Previous to this the limit was 10kW and after that you have to apply to the capacity cap and only get 60% net metering.
I have 200amp service and have a lot of loads and am planning on an all electric house (two large heat pumps etc). So my goal is to get to as close as possible to 200amps of current into my load panel. Since this is whole house backup...no load panel. Also, no generator, probably two Fortress evalult max batteries.
Also in MA only certain inverters can participate in demand response for the batteries, so I pretty much have to use SolArk.
- Two SolArk 15ks won't fly because that is 30kW of "nameplate capacity". Software export limits are not acceptable for the electric company.
- Three SolArk 8ks would work since they can pass 3*63Amps = 189Amps. Not bad.
- But is there a way to use two Solark 12ks? I ask because it would save $4500 over three SolArk 12ks and some wiring. Can you use an external transfer switch to somehow feed the inverters and the panel? Seems like this would create a problem. Is there something I am missing?
background: In MA the law recently changed (and the DPU is catching up) to allow up to 25kW of inverter capacity on single phase service with full net metering. Previous to this the limit was 10kW and after that you have to apply to the capacity cap and only get 60% net metering.
I have 200amp service and have a lot of loads and am planning on an all electric house (two large heat pumps etc). So my goal is to get to as close as possible to 200amps of current into my load panel. Since this is whole house backup...no load panel. Also, no generator, probably two Fortress evalult max batteries.
Also in MA only certain inverters can participate in demand response for the batteries, so I pretty much have to use SolArk.
- Two SolArk 15ks won't fly because that is 30kW of "nameplate capacity". Software export limits are not acceptable for the electric company.
- Three SolArk 8ks would work since they can pass 3*63Amps = 189Amps. Not bad.
- But is there a way to use two Solark 12ks? I ask because it would save $4500 over three SolArk 12ks and some wiring. Can you use an external transfer switch to somehow feed the inverters and the panel? Seems like this would create a problem. Is there something I am missing?