Image is a graph from the electric company showing my usage for a day this week. From 6:30 AM to 8:30 PM we used absolutely no utility power.
I’m almost at the three week mark for having this system up and running. The first two weeks I only had 3 KW of PV input but I added another 5 panels to bring it up to 4 KW last week. It’s also still running from a transfer switch in “off grid” mode because I don’t yet have the prep work done to move my breaker box and start moving circuits to it. (That means I’m either on full solar+battery or utility, no mixing or load sharing).
Once I get it wired in fully, I’m probably going to switch to time-of-use billing. Unfortunately, I can’t do that ahead of time because rather than just making off-peak use cheaper, it makes peak usage (M-F 7am to 9pm) extremely expensive while off peak dirt cheap. I wish there was a middle option, but it is what it is.
I’m also being very conservative with my battery usage since I want to have at least 50% in “reserve” to cover power outages. That’s especially important during these heat waves. We could easily run 24/7 but would have to take a day off every so often to just let it charge back up since my system is a bit too small to cover all our usage indefinitely (at least if we want to run the A/C for comfort, that is).
Wow, that’s rather massive!
Have you considered bringing an EV with V2H function into the mix?
Planning on getting an EV eventually but haven’t explored V2H. Could possibly use it as a second level backup or use it as the reserve and use my house batteries fully rather than treating them as empty when they hit 50% (saving the bottom half of them for emergencies).
But yeah, having an EV is still a good ways off (2-3 years minimum) so haven’t thought too much about it. AFAIK, nothing about my setup “paints me into a corner” such that I wouldn’t be able to use that functionality.
Your setup sounds great for including V2H, which would add another big amount of kWh to your electric energy storage - depending on the EV and its battery.
Take into consideration that not all EVs support V2H, but that might change a bit within the next few years.