Ronald Doctors wrote:
> ...believe me about needing clear sunlight!
> On rethinking this I would go with a lithium battery pack for
> all the power. The cost of good waterproof solar cells and
> all the headaches in using solar with recharging etc
> is far more than a good lithium primary cell system.
> ( PS I am building a solar array with full x-Y tracking
> using RF and STAMPS so i do have some experience )
I'm thinking about the quantitative aspect of this--
Paul is talking about a systems that is going to run 24 hours a day at 10ma
average, from "late spring" to "early fall". So about 100+ days.
100*24*0.010=24 amp hours. That is a pretty hefty battery pack. A C-size
lithium cell is rated 5 amp-hours, and costs about $11 each. You would
need 10 of them in series/parallel(?) to get 6 volts at 25 amp-hours, at a
cost of $110 per installation. Then you have to throw it away. I agree it
would be a simple solution, but maybe not the cheapest. Am I missing
something? 24 amp-hour gel cells are pretty hefty and expensive too.
Electronically Monitored Ecosystems