Can anyone advise me a good cheap inverter please? There seems to be 1000s out there and I don't know where to start! What does it definitely need to have? Any essential features cheap ones are missing? I only want it as a backup for the odd day when not on hookup. Some are like £25, others are £100s! We won't be needing anything high powered running off it, just the very essentials for the odd night. Thanks again, you guys are helping me out loads!