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

A 45 watt array that is set up for 12 volt battery charging will actually be wired for 18 volts open circuit voltage.

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

450w solar modules would charge a 12v200ah fully drained battery in 6 sunlight hours. Solarpanelstotalpower 12v 200ah 1 10solarpanelstotalpower 12v 200ah 1 10. Now the complete sentence. Introduction to 12v battery charging from a solar panel amps produced by your panel.

It was exciting times when i set it up several months ago to see the fr. Calculate the amps produced by dividing the panel wattage by 16 5. 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.

Then run wires from the battery to the charge connector making sure to match the positive and negative poles. Make the harbor freight 45w solar panel charge controller useful with a simple mod. To charge a battery with a solar panel connect a charge connector to the solar panel. In most cases a solar panel 12v battery charger that produces 1 amp of current takes 5 8 hours or more depending on the size of a battery.

In our case it becomes. How long to charge 12v battery with solar panel. Environmental factors will likely increase charge time. 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.

The solar charge times above assume a 25 degree celsius day with the panel pointed directly at the sun. Some quick rules for estimation. In one week you want to run a 65w television for 4 hours and an 8w light for 5 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.

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. For an effective charge you need to make sure that the panel is directly facing the sun and no obstacles in between.