I mean, outside of polar regions, solar + battery hybrids work well enough year-round. Solar + fuel cell + battery hybrids can work in Polar winter if you can

I mean, outside of polar regions, solar + battery hybrids work well enough year-round. Solar + fuel cell + battery hybrids can work in Polar winter if you can transport enough fuel, but the exhaust requirement is a problem (moving parts + can't let your fuel cell + batteries get buried in the snow). The solar panels also need to be raised every once in a while (or mounted high enough in the first place). Eventually reversible fuel cells might be a good option (use excess solar in the summer to produce methanol or whatever, then consume it in winter). edit... so I need 40,000 of these: https://www.batteryjunction.com/xl-205f.html https://www.batteryjunction.com/xl-205f.html :)