![]() I didn’t make a significant effort to conserve power at that time. I have four powerwalls and I spent quite a bit of time off grid while I was waiting for PTO. I had a year of data with solar.Īt this point I think the technology is there for powerwalls (or batteries in general) to power a house and allow it to be used as normal during an outage. I downloaded my PG&E usage for a year and did not see any time period I could not make it at least 5 days. Not all houses have large enough supply lineĪs for running PWs during extended outage. One more thing, The generator installers said they would have to verify the NG supply lines. Both give piece of mind and save a lot of hassle in prep for and during an outage. Generator would only payback after many outages. PWs have a payback even if you don't have an outage(s). I did some calcs for rate arbitrage and figurred I could pay back the delta in ~6 years. The net difference between 3PWs and generator quote was $6K. Because of rebate, going thru 3rd party, I could get 3 PWs for price of 2 (SGIP was depleted for 2 PWs). Tesla was cheaper, but would have to wait 6 months. I knew generator would be cheaper I got some quotes on 22kW generators running off NG which I have to house. ![]() I already had solar, and After PSPS last year, I decided to get backup either generator or powerwalls. Now, if I am wrong, lets see the numbers since as an engineer, love to see what and why folks have done what they have. But if I had to pay anything, even 50%, just never seen an ROI that makes the limitations worth it. Now if I can get some sgip batteries for 100% free, worth considering. I can run anything the wife wants, for as long as she wants. Its is sexy, but from an ROI, why? THis is why I got my generator first. What I have yet to see from anyone is what the cost payback is to buy any batteries for daily use. So, yep, one really really needs to think about what they are buying and WHY!!! If it is only for a power outage, thats one solution. When the power goes out, the generation panel with the solar basically is disconnected with the TS's are after this so when the generator kicks in, cannot feed either the grid or and connection to the solar. Yep, when it transfers, lose power for a few second so not seamless and I have to reset stuff. Connected to 2 200amp transfer switches to my 2 200 amp subpanels It is connected to a 500 gallon propane tank. I am about 1/3 rd of my summer rate at about 25 kwh for the day now so would have to be more careful with batteries Also would depend on how many solar panels I have and time of year. ![]() ![]() Now, with batteries, I could more easily keep the lights on, refrig running, and super low level things like that all day long. But, since not cheap to run and noisy, I only ran it for like an hour in the morning and evening for breakfast and dinner. When I had my power outage for a few days this week, I turned my 22k generator on. And generators are best suited for lots of power over short periods of time.”īased on how many threads I read about folks trying to run their house "normal" while on batteries, seemed this training made sense. “Batteries are best suited for small amounts of power over long periods of time. "When I was trained in the energy industry long ago, the rule was I had a solar guy comment back to a comment I made which was
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