My parents have a koi pond that they love, but the electric bill during the warmer months is getting a bit out of hand. The pump is 1200 GPH and draws .5 amps/380 watts. Would it be feasible to buy a solar panel that could power it or would the panel be extremely large and/or expensive. Obviously it would only help during daylight hours, so there would still have to be a domestic electrical hookup. Is there some type of switch that could automatically alternate between solar and household power as needed?