California to become first U.S. state mandating solar on new homes
2018 May 5, 4:30pm 9,319 views 32 comments
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Malcolm
@
2018 May 8, 6:30pm
Malcolm
@
2018 May 8, 6:30pm
EBGuy says
When I was reflecting on it, I was thinking there might be a value proposition for peak shaving. I'm still wondering if you would still use a PV system and how that plays in since it is producing at a lower tier rate. 10 years is still a little long for me, but if they get it to 5 years, I would say that it makes sense by itself without a PV solar system. If daytime rates fall low enough, a PowerWall will make more sense than a PV system. Interesting dilemma.
Malcolm, thanks for the maths!
So $3k might not be too bad for battery backup piece of mind, plus you can your program your Powerwall to supply electricity during peak rates.
Using PG&E EV rate schedule A, peak rate is $.21 /kWhr higher during summer (6 months) and $.12/kWhr higher the rest of the year
Discharge battery during Peak rates (~5 kWhrs to maintain SOC) .
$.22 x 5kWhr x 182 days = $200.20
$.12 x 5kWhr x 183 days = $109.8
--------------------------------------------
Savings per year = $310
Payback in 10 years (battery warranty is for 10 years as well).
When I was reflecting on it, I was thinking there might be a value proposition for peak shaving. I'm still wondering if you would still use a PV system and how that plays in since it is producing at a lower tier rate. 10 years is still a little long for me, but if they get it to 5 years, I would say that it makes sense by itself without a PV solar system. If daytime rates fall low enough, a PowerWall will make more sense than a PV system. Interesting dilemma.
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Now, California is on the verge of making solar standard on virtually every new home built in the Golden State.
The California Energy Commission is scheduled to vote Wednesday, May 9, on new energy standards mandating most new homes have solar panels starting in 2020.
If approved as expected, solar installations on new homes will skyrocket.
Just 15 percent to 20 percent of new single-family homes built include solar, according to Bob Raymer, technical director for the California Building Industry Association.
“California is about to take a quantum leap in energy standards,” Raymer said. “No other state in the nation mandates solar, and we are about to take that leap.”