# How many 250 watt solar panels do I need to charge a 12 volt 200 Ah battery in one hour?

En este articulo analizaremos How many 250 watt solar panels do I need to charge a 12 volt 200 Ah battery in one hour? Comencemos!

## How many 250 watt solar panels do I need to charge a 12 volt 200 Ah battery in one hour?

Check several aspects very well:

#1. The efficiency values ​​of the panels, some not very ethical or unknown sellers inform you the maximum value, but that is almost never achieved.

#2. The solar radiation index or Irradiance of your area, download the map that almost all governments publish online, there you will see the average value in kWh / day, that is, the maximum value that you will receive during a typical day

#3. Check the angle of inclination of the panels with respect to the sun, if they are in a fixed position, the energy absorption level will be less than the Irradiance.

#4. Always leave a margin of safety in your calculations, although thinking about charging the battery in just 1 hour leaves you a good margin of safety, because if you do not achieve maximum efficiency, you may have 4 hours of good sun in return.

#5. Check the specifications of the charger circuit vs the type of battery, some deteriorate a lot if they charge 100% very fast, it is a good charger, it will go fast up to 80% and then it will go to slow charge, even if it lasts more than 1 hour

This value of 10 panels is very imprecise, because factors such as Irradiance, the angle of inclination of the panels, the type of panel, eg. Polycrystalline (efficiency of 20%), Monocrystalline (higher efficiency with nominal power of 330 W) etc, etc, but as we do not have more data, that would be the “theoretical” value.

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