13.8 vdc power supply information

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EE Guy asked How efficient is AC/DC power adapter?

I am working on a device to be powered at a remote village in Africa where power is scarce and the power grid shuts on and off all the time everyday. The device works fine but now I need to consider how to power it. My device doesn't consume a lot of power. It is a microcontroller that operates at 5V and maybe draw around 1A of current. We are going to install a solar array with a battery bank for backup power for the village. If I want to go simple, I can just plug in an ac adapter to the wall, but I don't want to consume any of the precious solar power if a 220V->5V ac/dc power adapter is not efficient. The adapter gets very hot and I believe it is consuming a lot of unnecessary power. Or I can use my 20W/16.5V/1.2A penal with a battery, which should be more than enough to power my device day and night. I have done a lot of googling but I still can't find a proper way to charge a battery with a 20W panel. Any input regarding the best way to supply power to the device will be greatly appreciated! I have been looking into using an efficient DC/DC converter to reduce the variable voltage from the panel to around 7V and connect it to a sealed lead acid battery, and eventually go through a 5V voltage regular for 24/7 5V supply to my mircocontroller. But there is little control on how the charge the battery and it might die in a short time. I expect it to work for a long time as it is not possible for us to reach the system anymore once we left the village. Car battery sounds like a good idea and I have actually considered it as the locals can easily find a replacement if it fails. Only thing is, I am not sure how to charge a 12V car battery with a 20W panel, nor if it has enough power to charge the battery. A 16.5V/1.2A panel only produce 16.5V with the right amount of load, and I have no idea what the voltage and current is going to be once I hook up a penal with a car battery. So my idea was to use a DC/DC converter to step down the voltage to maybe 13V (float charge?) and by that the current gets boosted up. My then again, I don't know what kind of current do I need. I just extended the question in hope that more people will response. Thanks for everyone who have responded.

And got the following answer:

You are correct. When something gets hot, it is wasting a lot of power, (unless it's SUPPOSED to get hot, like a stove or oven.) Otherwise, cool = efficient. That 20 W solar panel probably puts out about 12-16 Volts, (depending on amount of solar illumination). Use that to charge a 12 volt battery, (actually closer to 13.8 V), with a simple regulated voltage reducer to 5 VDC. (A transistor, heat sink, 5 V zenar diode and a couple of resistors and a capacitor should be all you need. It will be smaller than a cigarette pack. The transistor will likely need a heat sink - it will run pretty warm if you're drawing much current.). Charge the battery with a charger, (120 or 240 V as appropriate) floating on the battery.. There should be plenty of power left over to run a fist full of white LEDs with series resistors on each for illumination. You may also want to put a charge limiter on the the battery so it isn't overcharged and damaged. This voltage dropping circuit will run about 30-40% efficient when you're dropping 12 V to 5. Otherwise the efficiency is well into the 95+% range. A "12V car battery" should be fine for this application! Actually, Ham radio operators have run repeaters - a receiver, a radio transmitter and a controller - on nothing but a car battery and a solar panel for years on mountain tops where there is no power available! If they can run that much of a load, your project should be very simple. As long as your AVERAGE total power drain is under 10 Watts, a car battery will run it for many days without charging - that's only half of what the solar panel puts out! (That will allow charging all day for powering it 24 hours without using the AC charger!) Personally, I would use the charger as a backup to the solar panels, and let the battery actually power the rest of the system. IF all you are doing is providing light for the town with LEDs, there is an easier way! If you're doing something else, like running a water pump, for instance, it's a different story. Most items which use power can be made to run on 12 Volts, so you may not need your 5V items. Send me a message and I'll see if I can help more. Good luck and God Bless!


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