Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Charges question

  1. Jun 9, 2014 #1
    I know it sounds like a really stupid question but i am a bit confused as to what to connect and just want to make sure i do it right. I have a solar panel to charge a set of batteries, i connect the positive wire of the batterie holder to the negative or positive wire for the solar panel, i believe its negative but I'm confusing myself a bit haha. thanks for the help!
  2. jcsd
  3. Jun 9, 2014 #2


    User Avatar
    Science Advisor
    Gold Member
    2017 Award

    Your idea sounds risky. You should connect + to + and - to -. That way, when the solar cell emf is just a tad higher than that of the battery you will get a charging current into the battery.
    You should make sure there is a series diode (+ to solar cell +) to stop the battery discharging through the solar cell when the light level falls. Many arrays are sold with a diode included.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook