[RE-wrenches] solar lease questions

Marco Mangelsdorf marco at pvthawaii.com
Sat Dec 17 16:09:07 PST 2022

Hey Jay,

I've been doing PV on the Big Island since 2000.

15 kW STC DC on 7.6 kW AC is ridiculous and not atypical typical of
Sunrun's crank-out-the-design-by-some-computer-program approach. When said
program calculates a 120 percent offset, does that factor in power output
clipping? I think not. Especially on the Kona side, which is sunnier than
the east side of the island, such a DC-AC ratio is pretty much sure to clip
A LOT I'm thinking.

Our current residential electric rates here on Hawaii Island are between
42.5 to 47 cents/kWh.


On Sunday, December 18, 2022, jay via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> HI All,
> I”ve got a friend in hawaii, big island near Kona  that is looking at a
> sun run lease and she’s asking me questions.
> I’m not that familiar with the electric rates nor the games that Sun Run
> is doing.
> They are pushing a 20 yr lease with the following system:
> 38 x 400 watt panels
> 2 x SE 3.8kw
> 2 x power wall
> it will offset 120% of her load
> loan is $398 month/ 20 yrs which is $95,000
> My first really big question is thats 15.2kw on 7.6kw of inverter?  That
> doesn’t sound right, 2 x DC/AC ratio?
> Does it make sense to have the batteries?
> And if you paid for the system outright, what would that be in Hawaii?
> Any and all help and advice is welcome,
> or if there any installers near there, that would also be helpful.
> thx
> jay
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