Since we know that 100-watts of solar power can charge 5amps an hour, we do this calculation:Ĩ0 / 5 = it would take 16-hours to charge the battery fully using a 100-watt solar panel. But, as we said, we are going to roll with that 80ah, and you can substitute the information as you see fit.
It is all dependent on the capacity of the battery that you have. As we said before, we are working with the 80ah figure here, but yours may be slightly lower or higher than this. Let’s go back to the amount of charge that we need to put into the battery. This leads us to the final part of the calculation and the information that you have been waiting for.īUY SOLAR PANELS ON AMAZON TODAY How long for the battery to charge? We will talk about that here.Īs a rough guideline, for each 100-watts of power that a solar panel has, you will be able to produce 5-amps of power per hour.Īs we know that there will be an average of 5-hours of direct sunlight each day, we know that 100-watts of solar power will be able to charge a minimum of 25-amps per day.
If you don’t, then you can buy one to speed up the rate at which your battery is charging. We are going to assume that you already own a solar panel. The solar panel is going to be the biggest determining factor in how long your battery takes to charge. So, now we know that we need to charge 80ah of battery on a depleted 100ah battery. Since you are only supposed to discharge deep cycle batteries a maximum of 80% before recharging them, there should be around 80ah of power to charge.Īlthough, of course, this can differ if you have not fully depleted the battery. You then need to account for how much charge is left in the battery. You can just substitute the numbers as we work through this math. If you are using something that is a greater amperage, or even lower amperage, it doesn’t really matter. We are going to assume that you are using a 12-Volt, 100ah battery. Read also: What Size Solar Panel To Charge 100ah Battery? (Explained) Determine how much power needs to be charged We are going to work through this equation using a little bit of math! We will talk about the number of watts left in the solar panel shortly.
#Solar panel to charge 12v battery full#
While it will be different depending on the time of year, the average amount of sunlight per day where the solar panel will be operating at full capacity will be around the 5-hour mark. The higher the amperage, the more stored power in that battery and, therefore, the longer that battery is going to take to fully charge.īasically, you can expect a battery that is 100AH to take half the time to charge as a battery that is 200AH. It is the amount of power that the battery is able to store. The amperage is the important number here.
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