Does anyone have experience selecting a solar generator for their ebike? I am not sure how to spec it out. Any tips? My battery is 48v 14.5aH.
Posted by RaceSailboats@reddit | ebikes | View on Reddit | 2 comments
Default_WLG@reddit
The simplest/lightest way to charge an ebike battery is to connect the panels to a 'boost' solar controller, and the solar controller to your battery. The panels can only provide so much power, so charge rate is naturally limited by panel output. This arrangement avoids heavy/expensive inverters and additional batteries (which is what you're getting with one of those 'solar generator' products).
I like the Elejoy Boost MPPT solar controller sold by Grin over at https://ebikes.ca/adjustable-400w-boost-mppt.html (there's various other suppliers online too). You can set the max voltage output on this controller. Your '48V' battery will have 13 Li-ion cells in series, and you must not exceed 4.2V/cell - 13*4.2V=54.6V, so the charge controller's output must be set lower than 54.6V. I'd probably set it to 53.3V (~90% SoC) to maximise cell life.
NavarreMan2@reddit
I am also trying to put together a "bullet-proof" system that I can share with other riders. It must therefore be protected from the elements, sturdy and reliable, easy to operate and able to charge at various voltages depending on the battery. I have designed, correctly I hope, the following based on my ebike and since you seem to know your stuff about this subject I thought I would ask your opnion if this is a good solution or not. Your critique is most welcome. I intend to include the following instructions: