Charge 4V lithium battery with 12V 3W solar panel, what will happen?

Like batteries, solar cells can be connected in series and parallel to get higher voltages and currents. … Note that 2.40V/cell for lead acid and 4.20V/cell for lithium-ion are the full-charge voltage thresholds. Charge controllers are also available for lithium-ion to charge 10.8V packs (3 cells in series). Re: 36 volt panels to 12 volt batteries You can have up to 145 volts in from the pv panels and choose 12 volt, 24 volt, 48 volt, battery systems . The mppt charger will convert the voltage down to correct charging voltages for your 12 volt system . Go to my Profile and you can find all about Solar Panel material there…