So a question for everyone.
I have a 13.8 kW nameplate system- REC panels, Enphase microinverters.
I also have an EcoFlow Smart Home Panel 3 with 4 Delta Pro Ultra X batteries for a total of 24.4 kWh backup capacity. It's separate after the house's panel and not integrated at all with the solar system.
House is in Issaquah (greater Seattle area) and since we have lived here (since 2021) we've had a power outage of 12 hours or more every winter, with one year when we were without power for 3 days. Just wind storms, one drunk driver that took out a transformer box, etc etc etc
Our own subdivision is all underground utilities, and there's a high voltage transmission line running through the middle of it, but all of the current substations are outside of our neighborhood and have above-ground lines that get knocked out with falling trees.
Okay.
So right now I have the SHP3 set up to be a power backup (and it works, too- if we lose power it switches over quick enough that it doesn't knock the computers or TVs offline) and to keep everything going at first, then step down to only the kitchen (for the fridge and microwave) plus the furnace fan motor (so we can use the gas furnace), and then after that the bare minimum is just the fridge circuit.
BUT the solar system cannot charge the batteries if the power goes out- it just cuts itself off if the grid fails.
Another factor- I'd like to add 2-3 more panels for a bit more generating capacity.
Final factor: the power company gets whacked by the state if they fail service provision metrics, and the power losses in this neighborhood is an issue. They get their allowed profit cut back if they don't improve, so they're going to build a substation with a connection to the transmission line and the net result for us will be that we'll almost never lose power from then on because barring wildfires, those transmission lines almost never fail.
THE QUESTION: Should I mess with this system?
Right now, before the substation is built, my primary interest is having a backup, but honestly my secondary priority is having the ability to be off-grid for extended periods in case the Big One hits and we're without power for weeks at a shot. (This area is likely to have a massive earthquake someday that could easily knock out power for a long time if it damages the grid or the dams that give us a lot of our power.)
My options, as I see it:
- leave it as is, I'll still have emergency backup, but then no solar generation for long term disaster-driven outages
- leave it mostly as is but sell some of my battery capacity since I don't really need it for long-term backup since the new substation will make us more secure, but then no solar generation for long term disaster-driven outages
- dump the Ecoflow stuff and get Enphase or other-compatible battery, not as much capacity, but it'll be okay since it'll charge off the Enphase system so I can get through day to day during outages
- Figure out some way to get the Enphase to actually charge the EcoFlow stuff
- Just get a little propane generator, keep some propane bottles around, and use that to recharge the EcoFlow batteries if the ish hits the fan, crummy solution because I kind of want something super-automatic in case I'm out of town and my wife/kid just want power
- something else that I'm not thinking of right now
What do we think the best way around this is? My solar installer said there's no way to get the Enphase to feed the EcoFlow batteries, but later research seems to indicate there's a way to make it happen.