I'm wondering how to efficiently charge and use the following system with standard 18V solar panels:
- 48V lead-acid battery
- 1kW electric motor
To charge the battery with either PWM or MPPT, the solar panel voltage should be more than 48V, if I understand correctly. Thus I can either boost the voltage to more than 48V (inefficient), or connect multiple solar panels in series (e.g. 3x18V=54V). The panels will not necessarily be oriented in the same direction, and shadows may be cast on individual panels, so I guess connecting them in series will make the whole array highly sensitive to the environment.
Alternatively, would changing the battery-motor system be an option? The 48V battery is made up of 4x12V packs, so I could connect them in parallel to form a 12V system that could easily be charged with the 18V panels. But I guess I'd require a new motor, right?
Any tips are appreciated!