Solar window chargers have several advantages when compared with other charger types. You can stick this DIY solar window charger to the inside of a glass window with the solar panel facing out and ...

The charge controller is a 400W MPPT unit that can be programmed to the correct output voltage (in this case 54.6V for a 48V 13s e-bike battery). I got mine for about $75 from Grin Technology in ...