"Neon John" wrote in message
...

A neon-john junk-box special. :-) There is an old APS 2kW (I think, the
nameplate is long gone) computer UPS that is over 15 years old. That runs
most of my "vital bus" which consists of lighting, a refrigerator and my
computers. The rest of the system is a series of cheap inverters that power
either individual loads like freezers or clusters of loads that are likely to
be operated at the same time. I'm currently saving my nickels to get a 3.5kw
ChiCom special, 24 volt input inverter for my wellpump. My 2.5kw inverter
just barely won't start the pump. It tries but the over current trips before
the pump is fully up to speed. It would probably start the pump if I let it
start unloaded of pressure.

You could use a sprinkler valve, with a check valve between it and the tank, to
unload the pump. Or, a spring check valve with the spring replaced with a
lighter spring to hold the valve open (instead of closed). As pressure builds,
it closes.