Hi Svbravo . Thanks for your interest.
I found a 200w 12v DC heater
on amazon.ca. A12v thermostat, on amazon.com (I bought two. One for the batteries
, and one for the fridge, to control a spillover fan from freezer
compartment is only about 1.5 cubic meters. And the cells are in a box, raised off the floor by about 12cm. So some holes on the bottom of the box, and near the top.
There's a nice bulkhead mounted, dual, 12v fan I may get, to encourage flow into the battery box
. I could heat under the box and let convection do the work
, but I want to get a feel for how hot the heater
will get. The elements are surrounded by aluminum
, so no fire risk, but the box is epoxy
over honeycomb, and I don't want any part of it to reach above 60 Celsius, or it'll soften, as that was my post cure temp.
200 watts is a lot, but it'll cycle, and the compartment is all insulated with the foam core
. If it's too much, I'll just heat under the box (with the thermostat in the box, )with a couple incandescent bulbs, At about 30 watts, and let convection do the work
When I'm aboard, and heating
to 20C, even at minus 19 C outside, the compartment is at plus 15 with the door cracked open. But when I'm not aboard, I want some heat in that compartment. The two Esparza heaters take about 40w each at minus 19C. So 200 watts cycling at 30 to 50% won't be too bad, if we are not running the espars.
I'm out of country right now and posting
with android. So please ignore choppy sentence structure... Let me know if you'd like me to post the links to the gear