I do not have mains power - just a 12v battery system. The problem is there are very few 12v submersibles that are a good match for my depth requirements - I dont want to pay $600 for a pump which is way overkill for my depth and usage (20 feet head, non pressurized, 10 gal/day). The 12v sump pump I found seems to be a good match. At 0 head it pushes 1500 GPH, but at the depth I have it will be a lot less and about right for direct usage. Would this type of pump be less efficient? FLA is about 16, but i dont know if that is locked rotor or for typical use. Oh thanks for the link, that looks like about what I need.