Is it safe for controller to connect it to solar array much bigger then controller rated output power? Let's say, would it be safe to connect it to 75V 3000W solar panels? I understand that max output MPPT controller would be up to 420W for 12v battery, but would like to know if it's safe for controller input?
Also would it be safe for MPPT 100/30 if I connect charged 24V battery to its input instead of solar panel to charge my 12v battery bank? May I assume controller will not fry itself, but will take 420W from input battery?