Gday Lewis
Quote:
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Some claim their 9V straps run a year on one battery.
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That would probably work if they weren't ever turned on
Can i ask a simple question???
How long does a ubiquitous 12V 7.2AHr battery last with a dewheater????
A 9V Alkaline battery is rated at between 400-700mAhr
ref one datasheet i found
http://data.energizer.com/PDFs/522.pdf
If you drop from 12V to 9V on a set resistance strip, your current draw will go up by about 30%
Sooo
12V with 7200 mAhr vs 9V with 700mAhr
No contest. unless the strip is only for a red dot finder etc with a very low heat requirement
You are better off looking for the new light weight LiPo battery packs etc that are used by the model plane nuts. Very high energy density and light weight, but costly.
( Or, just run one 12V wire to yr mount and have a distribution box on the mount to supply 12V as reqd. )
Andrew