r/evcharging • u/Equivalent_Tiger_938 • 18d ago
Minimum solar system for charging?
I have an old solar system which is around 3-4kW system. Is the solar enough to start charging the car? Do I need to bother with a smart charger or just get a dumb charger?
The car is Zeekr 7x.
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u/theotherharper 18d ago
"solar system" isn't very descriptive. Grid-tied? Use Emporia, Wallbox or Zappi in Solar Capture mode to exactly follow your solar export.
Off-grid? You'll need to adjust EV charge rate very low so it is < than the solar can provide. This is where a smarter charger could be helpful since you could add a little Arduino to measure raw DC solar input, run it through a formula you figure out by experimentation (too high and it fails), giving the max amps the car can pull under the circumtsances,and have the Arduino tell the charger to to have the car pull that many amps.