Staying under 10kW AC for net metering reasons

[Ferik]

For those that have similar net metering rules as Massachusetts with Eversouce, where you have to stay under 10kw AC to get 100% netmeetering (and not dip to 60% when over 10kw AC) Tesla's proposal to me includes 2 x 3.8 kW inverters for a total of 7.6 kW AC.

That would introduce a lot of clipping and really limit impact of the installation. Did you get a way to get closer to 10kw? Competitors offer 10 kW AC inverters or micro-inverters that allow me to get to 9.7 kW AC total, close enough.

What did you do?

 

[holeydonut]

What's the DC size of the array they're proposing? And do all your panels face the same direction and angle? Or do you have panels facing East/South/West?

IMO, some clipping is optimal. Enphase published a whitepaper saying a 1.20:1.00 DC:AC ratio is the best for efficiency/economics for their IQ Micros.

 

[Ampster]

Is there a way to model the annual production of each of those proposals. I think what @holeydonut is suggesting is that DC system size is also important. It is the area under the curve (system kWh output) not the clipped amount above the curve.

 

[adspguy]

In my case I have a 12.24 DC / 10kW AC system in MA. When my system was installed Tesla was using Solaredge 10kW inverters. I do not clip all that often, really only a few days last year for maybe an hour or two. What is your DC size?

 

[Ferik]

Around that size, we are still tinkering. I don’t know if they can still use the Solar edge inverter.