Hi, Have a P68, built in Jan 2011, serial # 008286918. I'm looking for some type of battery backup where I'm able to turn off the stove in the case of a power outage to prevent smoke back. Manual says the following can be used: APC BE750G - Discontinued, found APC BN900M 900VA TrippLite INTERNET750U Surefire 512H Another option: CyberPower CP1500PFCLCD PFC Sinewave UPS System, 1500VA/900W What should I purchase? In the case of extended power outage, I run a generator. Thanks in advance.