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How to hook a solar charger to a car battery?

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The74namesofgod

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i have a wifi dish i am going to use a wireless game adapter ,and hook it to a wireless router. i want to run it off a battery with a solar charger. the game adapter is 12 V 500 mA the wireless router is 5 V 3 A. i think i will use a car battery. i have to figure out how to get the 5 V out of it for the router with out wasting alot of power i also need to figure out how to hook a solar charger to the battery im not sure if i can charge it and use it at the same time. and i will be using it all day and night i want to know how long the battery will last. thanks for your help
 

Re: solar charger help

If You will have 70Ah / 12V car battary, time=(12V to 5V efficieny)*70Ah/0.5A
 

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