So... Your glider has less instruments and current draw than the one mentioned above in this thread. I also know several pilots who do not have batteries in their glider at all, and only use a handheld radio. Point being the new LiFePo4 have not rendered solar panels obsolete.

I do like the espresso maker idea though!

On Sunday, November 27, 2016 at 12:03:48 AM UTC-8, krasw wrote:

Hmmm. One could also install small generator in glider to drive set of christmas lights and espresso machine in cockpit.

I have e-vario, flarm, radio, PDA power and flarm display with small 8 Ah LiFePo4. It takes 11 hrs to run dry. Other similar battery is waiting in reserve. I could easily install similar physical size LiFePos with 30-40 hrs of current. That would be a week of gliding.