Oilpan4 wrote: ↑
Fri Aug 09, 2019 2:20 pm
No "12v inverter" is going to be able to run a 240v well pump on a 20 amp breaker.
Not so sure about that. For one thing, apparently my 1/2HP pump would normally be put on a 15-amp breaker, so we'd be talking 30amps at 120vac (using a 120->240vac step-up transformer). But the pump really uses about 1000 watts while running and double that startup surge, perfectly reasonable for a big 12vdc inverter.
Now I worry about damaging the Leaf's DC-to-DC inverter by trying to pull that surge with the big inverter straight off its 12vdc battery. So maybe AC couple it using a smaller inverter attached to the Leaf and some bigger 12v batteries to supply a larger charger/inverter's surge. That's just what @BrockWI apparently has done (or used to do) at the thread (especially see the last page or two): https://mynissanleaf.com/viewtopic.php? ... 92#p564092
But yeah, a lot of complexity.
Or build a well pumping system designed from the water level of the well and up to use lower voltage DC power. Like I am.
I will likely include a non electric backup to the electrical pumps.
I'm looking at using a pump like one of these: https://www.gopronow.biz/plastic-groundwater-pumps
and running it directly off the Leaf's 12v battery. Less than 2" diameter, so can slip it down ride beside the pipe for my main submersible 240vac pump. But of course this pump couldn't pressurize my house's water system (unless I build a water tower