Using 2 off-grid pumps is sometimes the best way to match the performance of your on-grid system while using the minimum amount of solar. Here we use a Simple Pump and a Dankoff Flowlight pump. I am using 1 – 240 watt module. Whereas the submersible is a 1.5 hp pump requiring about 1500 watts startup/surge. This system also includes the use of relays that are very helpful for controlling motors using low voltage devices like float witches.