Bosch E-Bike Direct Solar charger

A portable charger to charge a Bosch E-Bike battery directly from solar panels.
Can be combined with up to 300 Watts of solar power, which could charge the battery in 2 hours on a sunny day.

In this example, a 100 Watt solar panel was placed on an Urban Arrow, which also uses the Bosch system.

While cycling throughout the day, the first battery is drained and the second battery is charged. This way, charging from the grid is not necessary.