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Simple 1.2V AA battery Solar charger circuit

This is simple 1.2V AA battery Solar charger circuit. If you want to charge only one 1.5V AA battery and must used at outdoor that don’t has home electricity. We will also use fast it so we need to application devices near us.

measure voltageof solar cell about about 3_3V

This project is very easy and cheapest because we use a solar cell 3V 160mA and I measure voltage about 3.3V as Figure 1 so enough for charging.

And I will use AA 1.2V 700mAh Rechargeable Nickel metal Hydride Battery.


In addition, we need to have a diode. To prevent reverse voltage from a battery to the solar cell when no sunlight.

We use a number 1N4007 diode because it is cheaper and high pressure 1000V 1A general enough to use it.
circuit-diagram-of-aa-1-2V-Rechargeable Nickel metal Hydride Battery
AS Figure 2 we connected them in series are simple circuit.

We will take a charge of about 8-10 hours, or about 8.00 to 17.00 clock.
It will have full power, can measure voltage of approximately 1.3V. as Figure 3
aa battery is charged fully

This Post Has 8 Comments

  1. nice sir but where we get that solar cell 3v and what will the cost

  2. very good!

  3. A 2V solar cell would be more appropriate for charging a single rechargeable battery. With the standard 0.7V drop of a diode, you’ll have 1.3V of charge voltage, which won’t be high enough for a maximum charge, but a Schottky rectifier diode selected for 0.5V forward voltage drop would get you 1.5V charging.

    The 3V cell could charge two 1.2V rechargeable cells in series. While series charging isn’t a great approach (individual batteries have different characteristics, and when one of your batteries is going bad, series charging will present problems for the other battery), it’s not as if this solar cell + diode approach is a battery monitor with current regulation anyway. Use a Schottky diode with a circa 0.25V drop, and you’ll have about 2.75 charge voltage: 1/2 = 1.375V charge for each battery.

    I get epoxied 2V 100mA cells off of AliExpress.com for about US$1.00 each in quantity.

    Additionally, you should note charge current – a good rule of thumb is not to exceed 1/10 of the battery capacity – so a 2000mAh battery can take a 200mA charge – much more than that, and you’ll be damaging the battery by trying to charge it too rapidly.

  4. I want to run 2 volt solar Christmas tree led lights that currently have a AA battery running it in a remote area during the day as well as night. it only operates at night now, the lights are 170 mA. I tried modifying with using an additional D battery hooked to another small solar charger and covered the sensor closest to the lights and it runs barely during the day and is dead by night. what do I do? this is a month long use so I don’t want to spend a lot.

  5. a 3 volt solar cell used here for 1.2 volts. isn’t it feasible to use 2 rechargable batteries in series. 3 volt solar cell won’t trouble a 1.2 volt battery?
    and second question is how will it take 8-10 hours? 700mAh battery , won’t it take approx 4,5 hours to recharge?
    must reply please.

  6. Wanting to buy a solar panel to charge 1 Aa 1.2 volt battery

  7. I have a unique solar powered revolving colored lites. It is old and the solar panel is all weathered over. It works great for about 3days on a new 1.2 AA battery, then dies out. I just want to tie a new panel to the existing battery leads.
    Can you help me out?

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