I love it!
Currently looking for a way to cool our travel van (Fiat Ducato) during our travels between central and southern Europe. Temperatures at midday can go up above 40°C (104F) so I would like to cool down 20°C. When travelling in the shoulder seasons it can still be pretty cold at night (down to 5°C) so heating up by 15-20°C would be a nice option too if possible, but not absolutely necessary. Siestas are sacred where we travel and we'd like to be able to take a 1 hour nap during the hottest time of the day
It's a small van (not a real camper van, just a sleeper with lots of storage room), pretty thoroughly isolated with closed-cell polyethylene foam (thermal conductivity W/M x K 0.02 to 0.035), few windows (just 2 40x40cm rooftop skylights/vents), with about 12 cu. meters to cool/heat. Space is the problem here, most traditional airco units take up way too much space, that's how I got here in the first place when I started reading up on Peltier.
Oh, the electrical installation in the van is all 12V. Would that be a problem?
There are 2 x 12V AGM batteries (110Ah each), 2 x Solar Panel CB-100 (100W each) and a Votronic MPP 250 Solar controller (12V/18A/250Wp). It might be a bit of a mismatch 'cause at the time I installed this (and even now) I didn't much know what I was doing and just copied from other guys I found on the internet doing similar stuff.
At this point I just wanted to show my interest and to keep Alan motivated.