A useful solution for me that has dual functionality is the following:RustyShackleford wrote: ↑Wed Jun 26, 2019 4:09 pmWe prefer a more modest solution that involves single-digit kilowatt-hours of AGM (or maybe lead-acid) storage; that's still enough to run the fridge & cable modem a day or two and run the well pump enough for drinking and a little washing. I don't know if the installers don't want to bother unless it's as expensive as PowerWall etc, or if the PowerWall deals with a lot of the complication for them.
So that's gonna stop us, at least until I can figure out how to do it. I just can't see having all that power generation on the roof and not being able to use it when the grid goes down.
- I use a a golf cart to get around at my rural property, so I have about 7.2 kWh useable storage by keeping a spare set of 4 - 150 ahr trojan deep cycles (nameplate) as it is difficult to quickly get replacement batteries to the property - and impossible if a hurricane hits and we go to the rural property during the expected long term power outage at home (we have done this).
- The spare set is set up to be parallel to the golt cart batteries.
- My solar systems consist of Sunny Boys with "secure power" outlets that work well with the OEM 48 VDC golf cart charger that can recharge the batteries during a sunny day when the grid is down.
- I have used APC UPSs that will provide up to 3000 watts of 120 VAC power from the 48 VDC system. OFten very cheap on ebay.
- The system can easily run a a few lights, couple of ceiling fans, TV, and a fridge for at least a 24 hour cycle ( requires full sun days!!)
- I do have a means to manually switch the PV panels to a Midnight charge controller if a long term outage is expected for better capture of a energy during cloudy days. However, this switch its probably a DIY project.
- This dual functionality of getting around the property (quietly) with backup energy storage works great for me.
- Note that I have a propane generator system to run my water pump as it is a relatively large load at 240 VAC, and only intermittant use to refill containers.