Hi all! This forum has been unbelievably helpful, but I couldn't seem to find an answer via searching, so apologies if I missed something!
We're in the SF Bay Area and qualify for the $1/W Equity Resiliency rebate. Our average monthly usage is around 335kWh (going back 3 years), with a peak daily usage of 23kWh (average is a little over 11kWh). No AC, no pool.
Most installers we've spoken to have taken our average usage and recommended a system right around 3kW with a single Powerwall. Given the likelihood of PG&E having extended PSPS events, we were considering getting two Powerwalls to handle the longer outages as well as to be able to do whole-home backup with the 60A.
The SGIP Equity Resiliency rebate requires 52 complete discharges of the incentivized kW over the course of the year, which I don't think would be too hard to do? The other component is charging two Powerwalls from a 3kW system would just take forever if most of the solar goes to powering the house.
With all that said, here's the questions:
1) Is there any scenario where having two Powerwalls tied to a small system like mine makes any sense? I've seen the "1 Powerwall for each 5-6kW" rule of thumb tossed around, so I'm thinking probably not, but a guy can hope!
2) PG&E's NEM interconnect rules require sizing a system to max 120% of past 12-month average use. Is there any wiggle room there if we wanted to add some panels in order to help charge two Powerwalls? There's a non-zero chance we get an EV at some point in the next few years.
Cheers everyone!
We're in the SF Bay Area and qualify for the $1/W Equity Resiliency rebate. Our average monthly usage is around 335kWh (going back 3 years), with a peak daily usage of 23kWh (average is a little over 11kWh). No AC, no pool.
Most installers we've spoken to have taken our average usage and recommended a system right around 3kW with a single Powerwall. Given the likelihood of PG&E having extended PSPS events, we were considering getting two Powerwalls to handle the longer outages as well as to be able to do whole-home backup with the 60A.
The SGIP Equity Resiliency rebate requires 52 complete discharges of the incentivized kW over the course of the year, which I don't think would be too hard to do? The other component is charging two Powerwalls from a 3kW system would just take forever if most of the solar goes to powering the house.
With all that said, here's the questions:
1) Is there any scenario where having two Powerwalls tied to a small system like mine makes any sense? I've seen the "1 Powerwall for each 5-6kW" rule of thumb tossed around, so I'm thinking probably not, but a guy can hope!
2) PG&E's NEM interconnect rules require sizing a system to max 120% of past 12-month average use. Is there any wiggle room there if we wanted to add some panels in order to help charge two Powerwalls? There's a non-zero chance we get an EV at some point in the next few years.
Cheers everyone!