How Long To Charge 12v Battery With 45w Solar Panel

The solar charge times above assume a 25 degree celsius day with the panel pointed directly at the sun.

How long to charge 12v battery with 45w solar panel.

Solarpanelstotalpower 12v 200ah 1 10solarpanelstotalpower 12v 200ah 1 10. Some quick rules for estimation. Introduction to 12v battery charging from a solar panel amps produced by your panel. The short answer is in most cases depending on the size of the battery it will take around 5 8 hours to fully charge a 12 volt car battery with a solar panel that can produce 1 amp of current.

Make the harbor freight 45w solar panel charge controller useful with a simple mod. Now the complete sentence. It was exciting times when i set it up several months ago to see the fr. To get the most effective charging by a solar panel you have to maximize the amount of current by keeping the board pointed directly to the sun.

Like many of us who are interested in solar power i bought a harbor freight 45 watt solar panel kit for about 150 which came with three solar panels and a charge controller. Divide the wattage of the solar panel by the voltage of the battery to get the number of amps your charge connector needs to handle. 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. Panel manufactureres use a formula of open circuit voltage x short circuit current to get their array wattage but in actual practice the array voltage will degrade to the battery voltage during the entire charge cycle.

Environmental factors will likely increase charge time. In one week you want to run a 65w television for 4 hours and an 8w light for 5 hours. For an effective charge you need to make sure that the panel is directly facing the sun and no obstacles in between. Calculate the amps produced by dividing the panel wattage by 16 5.

The first thing you have to do it to compute for the ampere rating of the solar panel by following the equation below. In our case it becomes. Let s say you want to compute for the average charging time of a system with a 12v battery with 50 ah capacity and a 15 watts solar panel. Then run wires from the battery to the charge connector making sure to match the positive and negative poles.

To charge a battery with a solar panel connect a charge connector to the solar panel. 8 6k views 2 upvotes. A 45 watt array that is set up for 12 volt battery charging will actually be wired for 18 volts open circuit voltage.