Not directly related to solar-powered-servers, but rather power-involved-in-computing ... I have a solar powered van (not the engine, alas), and it has been amazing to understand how a day of my kind of computing (edit/compile/debug cycle with C++) uses more power than the 12VDC refridgerator in the van. The computer is a small custom built direct-to-12VDC miniITX with an i5 processor. The refridgerator literally has…
If you don't need all of the speed, I'd recommend disabling power boost. My i9 laptop averages ~10-15W with it disabled, compared to the ~20W my fridge uses. Even when maxed out CPU it's only ~40W, compared to ~100W with power boost enabled. That's more than double the power despite only being a modest speed increase!
Besides - power boost only affects usage when actually stressing the CPU, which for most people is rare. Gamers are probably the exception.