Replacement Batteries for UPS?

[terracore]

Our power went out about a dozen times yesterday, usually less than 15 minutes each time. I thought about plugging my TV into the computer's UPS but instead decided to plug the TV into a 2500 watt inverter connected to a deep cycle marine battery from Costco. Then I had that hooked up to a regular 12 amp battery charger connected to the Helco line. And I watched the TV like that most of the evening. I was thinking at the time that I was basically using a UPS system on steroids. I have the battery and inverter in a rolling tote. The intended configuration is that I can hook it up to my two 100 watt solar panels to charge the battery, but its nice to have this alternative use as well. Before I got the solar panels I used this "UPS" to give me a break from the generator noise after Iselle. I was able to run a full-size fridge off it for several hours, as well as run lights. Eventually I bought one of these:

http://pduwhips.com/products/1999-5-15p-...apter.aspx

WARNING! POTENTIALLY NOT RECOMMENDED DANGEROUS OFF LABEL USE! DO NOT TRY THIS AT HOME! And I'm able to feed the power directly into the house through the generator plug that leads to our electrical panel (yes, we have the backfeeding lockout system in place etc). As expected with this cord the inverter only outputs on one leg and that what is fed into the house (this isn't a magic cord), so only half the circuits work. Fortunately my fridge, ceiling fan, lights etc are on the powered leg so it meets our needs well.