Being into servers and that, my thoughts go to some sort of APC UPS. Which has batteries and supplies power for maybe 15-60 mins for 230W or so... you can pay for bigger and smaller.. If you look at their site the 1500VA might do 30 mins and the 2200VA up to 2 hours. Unfortunately the model numbers seem to equate to their RRP.
The batteries and UPS are high voltage so you really really really can't afford to get one wet - so I hope I'm not suggesting a death trap.
(I only have one tank and don't run any backup power ;>)
- shorty likes this