I'm putting together my shopping list for my new tank and it just dawned on me that the power tends to go out at my new house when ever there is a strong rain. What is the consensus on battery backup units? As in, do you get a battery that would be strong enough to run only your return pump or most of your system? And, is it better to go with proprietary battery backups, like the one ecotech makes for their pumps, or are there better options for the price?