propane catalytic heater is my first suggestion like the link posted. generators are great but for a few issues proportional T-stats use a triac and typically they need pure seine wave energy (not modified or square) They can when used in conjunction can fail open. here Dion is speaking about UPS (not a good solution BTW it only will last for a short time.
http://spyderrobotics.com/home/support_ups.html
To my knowledge the only pure seine wave generators are honda. If you have a back up on off system it should be fine just not proportional or units with triacs. Just thought it was important to mention that the typical gen could cause a proportional t-stat to fail most fail open so full heat.
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