Had a chat with a work colleague today who is right techie, he to seems to think that with a motorcycle battery and a couple
of PC fans we could get around 28 hours usage, he had a few of the batteries there as he uses them in intruder alarm bell boxes
and they seem much more suited.
Only down side is that they around £40 a piece :doubt:
Certainly going to try the convection chimney first.
Thanks for the advice and comments so far, much appreciated.
Stu.