Now go out and buy some Solar Panels and NiMh batteries. Now you've got a basic idea of how to add solar power to your projects. Though this being solar, it would still take a while. (AAA batteries hold between 800 -1800 mah, so we're probably ok for them as well as we're never going to actually get the full 160 ma from the cells.) If you really want to charge up your batteries fast, you could try and hit the C/10 power supply. As our batteries are 3000 mah capacity, and we're throwing 160 mah of charge at it, we're ok. As a general rule of thumb, you don't want to throw more than 10% of the capacity of the battery (C/10) at the battery when charging. We're going about our charging using the "trickle" method. Your standard wall charger has brains that let it fast charge a battery without blowing it up. ![]() You're probably asking yourself, "hey, why doesn't he hook up a whole lot of panels to throw down a massive amount of amps and fast charge those batteries!" Good point, but if I did that I'd kill the batteries. If I had a bigger case I could hook up another one or two to give me even more power. The charger will control how much and how. In this guide I hooked up two panels in parallel to give me around 160 mahs worth of power coming in. A solar battery charger takes energy generated from solar panels and feeds it into a leisure battery or battery bank. Also, because one of my solar panels only puts out 80 ma at a max, it's going to take a long time to charge up all 3000 mah hours my batteries hold. With only 4.5 volts coming in, I really shouldn't try charging up any more than two batteries (hooked up in a series giving me 2.4 volts). Features: 7.5-Watt solar panel uses sunlight to trickle charge your RV, camper, boat, or trailer battery Connects directly to your battery with included cable. For instance, the ones I'm using in this project put out a max of 4.5 volts and 80 ma of charge. Contact us toll-free: (877) 297-0014 for expert assistance and wholesale. Contractor Discounts Available All Remote Industrial Solar Systems Batteries. That or check the maker's webpage.) Secondly you need to know your solar panels. Solar Electric Supply specializes in supplying dealer, contractor, government and industrial accounts worldwide with reliable, cost-effective solar + storage battery backup system solutions. (Check your batteries, they probably have the capacity written on them. Your typical AA NiMh battery probably is 1.2 Volts and has anywhere between 2000- 3000 mah worth of charge in it. ![]() NiMh batteries are the most common these days, and you can find them at any store. When making a battery charger there are things you should keep in mind. Solar Power is fun, and adding solar to your projects is even more fun.
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