You also lose some energy to heat while charging and discharging. And depending on load profiles, you might not be able to load all of your excess solar power at once (depends on how many Watts the battery can be charged at) or fulfill your power requirement with battery alone (depends on how many Watts your battery can deliver).

But how safe is this really? These things sell to have quite some power and torque, so could probably maim someone by accident. And if they run with AI, I’m not sure there are actual safeguards in place that would be reliable? Just telling the AI to not do something doesn’t work with other AI approaches either…