If you have a large enough battery bank to support a DC "demand" pump (a pump switched on and off with a pressure switch, so it pumps water "on demand, rather than as power is available like a solar or wind pump), many DC pumps operate more efficiently than AC models.

Being able to operate a well/water pump off a battery bank will allow you to build the most efficient, simplest water system, as the only components you will need (besides your battery bank and power source) are your DC pump, a pressure switch (if the pump does not have one built-in), and a pressure tank for minimizing pump cycling.

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