solar battery charger

Registered Users Posts: 3
will a 45 watt solar charger putting out 24v 2a be enough to get more range on my 36v battery while riding my ebike?

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  • Super Moderators, Administrators Posts: 33,675 admin
    No--It will not...

    Batteries can be very sensitive to charging conditions. You need to know what kind of battery (lead acid flooded cell/agm/gel/sealed or Li Ion of some type).

    Voltage is the electrical equivalent of water pressure--Your charging voltage has to exceed the battery voltage to get current to move into the battery.

    There are a few small charge controllers, such as from Genasun, that can take lower voltage from solar panels and step them up to higher voltages.

    https://genasun.com/all-products/solar-charge-controllers/for-lithium/gvb-8a-li-lithium-solar-boost-controller/

    Over charging batteries can result in a high risk of smoke/fire--And certain types of Li Ion are particularly vulnerable.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • Registered Users Posts: 3
    thanks for the reply.i have a 36v lithium ion battery that i was hopeing i could trickle charge while riding to get more range.
  • Super Moderators, Administrators Posts: 33,675 admin
    There are a lot of differing Li Ion chemistries/construction out there--Need to know which one and charging details to be safe.

    Regarding range boosting, it can be done--But do a little math first. Figure out how many Watt*Hours per mile you use--And how much a "reasonably sized" solar panel can supply. In general, a solar panel for a mobile operation does not add much range and can cause other issues (large panel picks up wind/causes drag/blow you over, glass panels are easy to shatter, etc.).

    If you get (made up number) 1 mile per 100 WH, and you want to extend your range 5 miles, very roughly:
    • 5 miles * 100 WH/mile * 1/0.77 solar panel+controller derating * 1/4 hours of sun per day (not-winter) = 162 Watt solar panel
    • 45 watt panel * 0.77 panel+controller derating * 4 hours of sun per day = 139 Watt*Hours per day (full sun from 9am-3pm minimum)
    In general, you are probably better of making  a "charging kiosk" where you park the scooter (work or home)--But the whole project is generally not worth the costs.

    -Bill

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • Registered Users Posts: 3
    i do have a regular charger but wanted something more mobile,thanks for your reply.

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