How Much Solar Panel To Charge Battery

Generally a fully discharged 12 volt 100ah battery needs 1200 watts of energy to be 100 recharged.

How much solar panel to charge battery.

Charge 100ah battery standard size solar panel is 58 inches by 27 inches 2 solar panel for 150 watts 12 volt each for 5 sunshine light hour takes to recharge 100ah 12 volt battery. Environmental factors will likely increase charge time. In that case you d get a charge controller rated for 30 amps. Besides a solar panel the following items are also required.

In order to charge a 12 volt battery efficiently you ll need a solar panel that produces 12 volts. 50 is 50 of our 100ah battery and 6 is how many amps the 100w solar panel is generating. If you re concerned about performance and speed invest in a 16 volt solar panel instead. So if you have a 100ah rv battery you can charge 50 of it in a little over 8 hours 50ah 6a 8 33.

Since we assumed that battery is at 10 level it means that we have to charge 2400whr 90 2160whr the energy we need from solar panels is 2 16kwhr. This panel will generate more power which will make a battery recharge faster. You can get the amount of energy it will provide the battery by multiplying 10 watts by 6 hours which will give you 60 wh. 10 watt 18 volt solar panel charging a 12v 10 amp hour lead acid battery 120 wh from 50 full to full time 60wh x 2 10 watts 12 hours.

When charging batteries with solar energy one should use a controller when the rated amperage of the solar panel is above 1 of the battery capacity. So in order to charge these batteries in 6 hours we should have 2160whr 6hr 360w solar panels. There are two main types of controllers in the market which include on off and pulse width module pwm. The general rule of thumb is that a 100 watt solar panel can produce about 30 amp hours per day so you can use this guideline to determine about how many panels you need.

Now we have also assumed that there are 6 peak sunlight hours. 3 choose an mppt charge controller for better efficiency. So if you have a solar panel that with a 10 watts power rating and it is exposed to sunlight for at least 6 hours. A 100w solar panel like the renogy 100w i own two of these generates about 6 amps per hour 50 70 watts during the peak sun hours of the day.

For example if your solar panel is 300w and you want to charge a 12v battery you d divide 300 by 12 to get 25 amps. Another suggestion is to match your battery capacity in amp hours with your solar output in watts. The solar charge times above assume a 25 degree celsius day with the panel pointed directly at the sun.