We are successfully using a single 170w panel and a MPPT boost controller to charge our three 48v e-bike batteries. With this extremely simple set-up, we logged 2500+ miles of solar-powered bike riding from March-July 2020.
It is working well and keeping up with our current needs, but we have some planned upgrades:
- Intelligent Charging
- Switches/distribution panel
- Large Cheap 48v (maybe DIY) battery for storage and
- at home charging while riding
- DC-DC Charging
- better storage while touring the Friendmaker