Some great insights there in managing your loads to work
with the sun. I just saw from another thread that ice is roughly three times more efficient at storing energy than lead battery
and a bit better than Lithium. So, the ice for drinks isnt just a joke to me any more.
I am using 12 Volt carbon foam batteries
(Firefly). They are basically a lead version battery
that gets you about halfway to Lifepo without the cost or complexity. I looked hard at LifePo, but at least at my skill level I felt they were too finicky and too expensive. Nigel Calder has been field testing them for a couple years now. LifePo certainly is easier to find space for.
By the time I got down to the boat
yesterday it was cooling
off. It was in the 80s here yesterday, but closer to 70 when I was there. I wasnt sure the best way to really evaluate the cooling
of the greenhouse panels
. I took a pic including the heat readings of the solar
panel surface and the surface next to it, which in some respects may really show that what surface the panel is mounted to is the biggest variation in temperature. The bimini
panel mounted to dark blue sunbrella was at 95 degrees while the sunbrella itself was 102 degrees. The panel mounted to the white king starboard at effectively same angle and same location was 81 degrees while the adjacent starboard was at 77 degrees (I apparently failed to get a pic of the last measurement). My quick conclusion is that the polycarbonate appears to be reducing the panel temperature by at least a few percent, assuming hat the black panel should be at least as warm as the dark blue or white surface it is mounted to.
Gotta run to the boat
today to sail, so more details later perhaps .