SunPower vs LG Quotes in North California

So you say that paying a little bit to the POCO for the extra power I need is much more cost effective than overbuilding and adding more panels. Our usage is probably just under 10kW but with a growing family that usage will increase as well. The cost of meeting that need more of the time is clipping mid-day. What can I say it's Massachusetts - we live on that green media (but don't discount the health benefits of positive thinking and feeling good about what you're doing and the choices you make!)

re: Sunpower being the best - the installer showed me the panels and "explained" that they have better tech (something about connections, heat and front vs back of the panel) and he has Sunpower on his roof. I suppose the good ones are all about the same and indeed, I am skeptical of the degradation rates they quote. Comes down to money and the difference in cost isn't huge. As long as the system works and I can break even in year 5 I'll be happy.

No, that's not what I'm writing. I'm writing that the most cost effective way to meet long term electrical energy needs is not usually replacing 100% of annual residential electrical usage with PV, and the way to find out is to start by not assuming, or knee jerking because you've got a woody for the POCO, or get B.S.ed into it by some peddler who makes money putting PV on your property and not providing you with the most cost effective way to meet your long term electrical needs, that a 100+% offset makes the best sense. What I am writing is that if you're after the most long term cost effectiveness, it ain't that simple - not terribly more involved, but more than throwing simplistic and lazy thinking illogic at the situation.

FWIW, the most long term cost effective way of supplying electrical needs to a residence is usually a mix of use reduction, conservation improvements, conventional POCO power, and finally alternate energy generation - and probably in something of that order in proportions that result in the lowest long term life cycle cost of supplying a current and future anticipated electrical load.

As you wish on oversizing. NOMB. While I believe the way I've learned and studied such things makes flexible sense, it's probably more involved than most folks want to spend time on.

As for your installer explaining things and perhaps hoping you'll infer that he'll be more believable or honest because he has a Sunpower system on his roof and thus perhaps a valid reason for you to perhaps believe him: I too have a Sunpower system on my roof. By my criteria, it's not cost effective for me but that's not why I have it.

Nor do I have Sunpower because the quality is better - it is not, at least not for the premium paid. It's good quality, but no better or more fit for purpose than other equipment that's less expensive. Why I have Sunpower is a long, boring story and explained here in prior posts, but unrelated to (non)cost effectiveness.

Opinions vary, and mine is but one. But, unlike your potential installer, I've got no skin in the game, and only more opinion or conjecture, I suspect I may have a working knowledge about some things related to alternate energy cost effectiveness (or, perhaps more correctly, the lack of cost effectiveness) than your potential installer may be aware of.

Take what you want of the above. Scrap the rest.

Do the math and see if it is.

If you are on a tiered rate, the first kwhrs you generate are worth a lot more than those extra kwhrs you generate. So your first (say) 6kW may do a lot to reduce your bill - the next 4kW not so much.

That's a good thing to consider. If you determine your "ideal" power is 6kW, for example, you might want to increase that by some amount (say, 25%) to allow for growth. Future purchase of an EV may also affect that.

Sunpower makes good panels. But so do other manufacturers. Compare the panels on specs, not on salemanship. He may be referring to temperature coefficient, which gives you less power loss when it's hot. Fortunately that's readily available in the specs.

Hey there, new to the forum. I got a couple of quotes for solar in my all electric home in the Los Gatos, CA mountains. We have a flat roof home with some shading and limited space. We have a detached garage with a flat roof as well. I guess there is additional cost when installing on flat roofs.

Sunpower has quoted us $37,444 for an 8.5Kw system using 23 of the X22 370W panels mounted on both the home and garage. With the rebate and friends and family discount this comes down to $24,211. Sunpower also said they would not charge me an extra $1700, which is typical for flat foam roof installs.

Cinnamon Solar quoted us $31,777 for a 6.5Kw system using 18 LG NeONR-360Q1C-A5 B-W panels mounted only on the home. After rebate cost is $22,244

I am right in thinking that both of these are really high? Should I spend the extra money on Sunpower since I do have some shading and space limitations? Should I try Solaredge or just any local solar company in my area?

Thanks for any input!