I was reading the prior messages here on backup sump pump systems. I came across one called the Pump Sentry by Stabylex that looks interesting. Basically it is a DC/AC power converter that you plug your existing AC pump(s) into. They claim continuous 3000 GPH (for a standard 1/3HP pump with 10') for up to 8 hours using a single heavy duty marine battery.
Does anyone have experience/knowledge of this product. What surprises me the most is the claim that the standard AC pump will basically operate at normal capacity while under battery power. If this is true, it looks like a great product.