How Many Watt Solar Panels Need To Charge Deep Cycle Battery?

Today we’re going to know how many watts of solar panels do you need to charge a deep cycle battery in the simplest way possible. I am going to give you a certain watt-hour charge load, and we’re going to figure out how many watt solar panels need to charge a deep cycle battery with a certain amount of days of autonomy or what size solar array will charge that battery in a decent amount of time.

Let’s think, You have a 12 volt 100AH battery deep cycle battery.

That means you need 100 amp to charge the deep cycle battery within hours. But most probably in Australia, you will get 10–12 hours of sunlight to your solar array. We consider that your solar panel will get sunlight average of 10 hours every day.

So let’s calculate how many amps we need to charge the battery fully within a 10-hour solar array.

If We have a 100AH battery then divide it by the total hours of the solar array.

100/10=10 amp

So we need a total of 10 amp from the solar panel to fully charge the battery in 10 hours of the solar array.

Now convert the AMP into the solar panel watt. We need 10 amp.

We know that,

Watt= AMP X Volt.

(Here Amp=10, Volt=12, and Watt= unknown)

So, Watt= 10 X 12

= 120 Watt.

So we need to use one 150 watts solar panel or two 100 watts solar panels to fully charge the deep cycle battery in 10 hours.