Basically, the rasperry 4 has 2 GFlops/watt and that's as good as it will get. So I'm transitioning to raspberry that powers it's own screen for a 15W computer

Basically, the rasperry 4 has 2 GFlops/watt and that's as good as it will get. So I'm transitioning to raspberry that powers it's own screen for a 15W computer that can run 40 hours with a 50Ah lead-acid battery.