Forgot to say: The main reason I have that Model S pack in the workshop is to provide power for testing drive units. It's sort of overkill for a home backup. I've never used more than about 10% during a power outage, but it's sure nice to know it's there!
On Tue, Jan 16, 2024 at 7:13 PM (-Phil-) <p...@ingineerix.com> wrote: > My backup is a complete 85kWh pack from a 2014 Tesla Model S which is > hooked to a 15kW split-phase inverter made by Bel (out of production), but > with some crafty software on my controller I can go open my main breaker on > the meter and turn on that system. It fires up the whole hose, then when > (if) the sun comes out, my SMA 7.7kW grid-tie solar inverter "thinks" that > the Bel inverter is the grid and begins pushing back into the Tesla > battery. When the Tesla pack hits 85% SoC, my controller "burps" the AC > by switching to 50hz for one cycle, then back to 60hz. This causes the SMA > to disconnect and wait 5 minutes. It will keep repeating this until the > SoC is below 85%. The controller is based on an ESP32 so it has a web > page and will send out low SoC warnings to my phone. My house is > heated/cooled by a LG multi-zone mini-split heat pump, so it runs fine on > the off-grid system. I also still have the house's original natural gas > furnace if needed, but I normally don't run it. > > I told myself I'd automate this with a big 250A contactor on the main AC > input, but it's a lot of expense/work and the power isn't out here but > maybe a few times a year, and I can handle the manual switchover when it's > needed. I have all my critical gear on a 2kVa off-line UPS hooked to a > 48v 280Ah LFP bank, so that will stay up anyway. > > Picture of the Tesla pack in my workshop: > https://ingineerix.com/pic/?tesla-super-powerwall > > Bel 15kW inverter: > https://www.belfuse.com/product-detail/power-solutions-custom-value-added-solutions-emobility-350invch150-inverter-charger > > On Tue, Jan 16, 2024 at 6:13 PM Phil Hochstetler via EV <ev@lists.evdl.org> > wrote: > >> Portland Oregon area just experienced a wind/cold event that took away >> power from 150,000+. >> I have a new in the box 7500 watt tri-fuel generator but had not set it up >> yet (of course). >> My model 3 was charged, but not setup with an inverter yet due to lack of >> motivation, but our Rav4 Prime >> had a full tank of gas and the 1500 watt built-in inverter that runs off >> the high voltage pack. >> I wired a short cord on the furnace (NG furnace) so we had heat as it was >> 12F out and ran a cord into the house >> under the garage door so we could run a light or two and the 2 burner >> countertop induction stove and refrigerator. >> Pretty sweet. In on mode (with doors locked with key), the rav4 would >> turn >> on when the battery got low and recharge the battery. >> After 24 hours, it used 1/8 tank of gas but we were warm and had >> light/food. I went out and got 10 gal of gas to fire up the generator >> and the power came on before I got back. Still fun. >> >> Phil Hochstetler >> >> On Mon, Jan 15, 2024 at 5:58 PM Mark E. Hanson via EV <ev@lists.evdl.org> >> wrote: >> >> > Hi Folks, >> > >> > I was reading Otmar's inverter connection to a Tesla-3 and looks like >> Tesla >> > makes it really difficult to run a 1500W 12V inverter from their EVs. >> My >> > Bolt shows 130A available from its DC-DC converter, just clamp the >> Harbor >> > Fright inverter (have 1500W with 200A inline breaker, short aligator >> > clamps) >> > on the battery & the Leaf appears to be rated about 90A, so probably not >> > enough to run my mini-split at 12A, 120V. Presently if the power goes >> out >> > - I just put another log in my wood stove, but thinking it would be >> nice to >> > run one of my EV's as the 64KWH power source incase the power goes out >> for >> > awhile. I have a Bergey wind turbine on LiFePO4 7KWH batteries, but >> that >> > would only last a few hours running the Pioneer mini-split. Has anyone >> > done >> > this successfully? The Bolt has to be *on* in neutral or park with the >> key >> > in to keep the DC-DC converter alive. Would rather not have a Kerosun >> for >> > backup... >> > >> > Subject: Model 3 Inverter Power Connection - Otmar's Variety Blog >> > >> > >> > >> https://www.cafeelectric.com/blog/2020/06/08/inverter-power-connection-1/ >> > >> > >> > >> > Have a renewable energy day, >> > >> > Mark >> > >> > Mark E. Hanson >> > 184 Vista Lane >> > Fincastle, VA 24090 >> > 540-473-1248 phone & FAX, 540-816-0812 cell >> > REEVA: community service RE & EV project club >> > Website: www.REEVAdiy.org (See Project Gallery) >> > UL Certified PV Installer >> > My RE&EV Circuits: www.EVDL.org/lib/mh >> > REEVA Demo: http://youtu.be/4kqWn2H-rA0 >> > Fincastle Solar Weather Station >> > >> > >> > >> > _______________________________________________ >> > Address messages to ev@lists.evdl.org >> > No other addresses in TO and CC fields >> > HELP: http://www.evdl.org/help/ >> > >> > >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: < >> http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20240116/6e56ff04/attachment.htm >> > >> _______________________________________________ >> Address messages to ev@lists.evdl.org >> No other addresses in TO and CC fields >> HELP: http://www.evdl.org/help/ >> >> -------------- next part -------------- An HTML attachment was scrubbed... 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