Re: Can I Use Solar for 220 volt AC Well Pump?
Yes you can use solar to run a 220 VAC water pump. It isn't very efficient, as it would cost a lot of money to build a system capable of it.
The number of batteries isn't dependent on the pump Voltage but rather on the over-all power capacity needed.
The pump has a demand of X Amps @ 220 VAC. You need an inverter capable of 220 (actually 240 VAC these days) output with enough Watt capacity to handle both the running power and the start-up surge demand, which can be very heavy (like 5 times the running Watts).
The inverter is power by a battery bank capable of the system Voltage required (12, 24, or 48) and with sufficient Amp hours to run the inverter and pump as demand requires. Determining that can be a bit tricky, as you can't plug a 240 VAC appliance into a Kill-A-Watt; they are limited to 120 VAC (except perhaps in Europe?). Knowing how long the pump will run each day requires some investigation. If you can control the run time (by using large pressure tank(s) to store water) you're ahead.
The size of the battery bank determines what is needed for solar panels and charge controller to replenish it.
Last edited by BB.; August 24th, 2012 at 8:44 PDT.
Four 175 Watt panels, OB MX60, 232 Amp hrs, OB 3524, Honda eu2000.
Ohm's Law: Amps = Volts / Ohms
Power Formula: Watts = Volts * Amps