Dont recommend it at all!
1/ you can only record the channel the TV is on, no watch one prog whilst recording another.
2/ If the VCR needs repair you lost your TV too!
TôMö
Yes it is but if available power is that critical, buy the TV, sort out the power, then buy your VCR....good things come to he who waits! <G>
You might like to take a look here: http://www.roadpro.co.uk/products.php?catid=1226 and elswhere there is a lot of helpful info.
TôMö
You would be better going out and buying an inverter (make sure it is both smooth enough and powerful enough), you can then buy a cheaper tv and also use it to power other mains equipment on board, such as power tools etc.