Biolite's use of a pelteir panel used 'in reverse' to create a potential voltage within a given amperage uses a small panel. By using more than one panel and modular charging circuits,, small battery charging capability and large battery holding power is achieved.
A panel with a chosen length of maybe 3 feet could be very usefull. The width is better left to the desgin's natrual calling of such- so it will be decided later
Heatsinks on one side, black painted aluminum panel on the other. Thermo paste would require a frame to hold the panels in their locations. The paste wont 'adhere' very well.
High voltage panel droped to lower voltage (via the texas instruments IP using fastswitch/ic tech(emp sheilding?)) to charge a deep cycling battery per panel. As the batteries fill they get removed and placed into a different apparatus/appliance. With relay switches and some thoughfull planning the system could go down a battery bank and charge it while another inverter power source relay system with interupts gathers power from toped off cells. No taspberry pi needed.
The things heavy switches can acomplish is more than you expect. I had a growroom more or less programmed with different relay/switches(timers, thermo, photo, bypass)
Solid state power generation should meet the Real needs now that... Even HO T-5 lights can be used. Radio systems dont burn up with heat. Its electricity, not wood or heating fuel ya know...