Portable DC charger help
#1
04-29-15, 11:39 PM
Join Date: Apr 2015
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Portable DC charger help
I need to create some sort of power source for my Raspberry Pi, it requires a standard DC cable, and what I have got is 4 AA rechargeable batteries that all add up to 24000mah. The device takes 1 watt and in continuous use that would last around 16 hours with the batteries. I need some sort of way to massively extend that time period. I'm new to this sort of thing, so I thought that I could go with some sort of thermal power that is initially powered by the batteries, and then creates more power that would in turn go back into the batteries and power the raspberry pi, this will be incorporated into a plastic casing that will attach to a hard surface, so it can't be very large at all. And solar power isn't much of an option due to lack of sunlight in the area it will be placed and it unreliability to run continuously.
#2
04-29-15, 11:48 PM
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Welcome to the forums.
You are looking for perpetual energy. You aren't going to find an adapter or charger that creates power from nothing.
Also, with your AA batteries. You've stated 24,000mah. That would be 24 amps of power.
If the batteries are in series then you add the voltage... which would be around 6vdc and the current is what one battery is which is more than likely 2400 mah.
You are looking for perpetual energy. You aren't going to find an adapter or charger that creates power from nothing.
Also, with your AA batteries. You've stated 24,000mah. That would be 24 amps of power.
If the batteries are in series then you add the voltage... which would be around 6vdc and the current is what one battery is which is more than likely 2400 mah.
#3
04-30-15, 12:50 AM
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Like I said, I am new to this, and I haven't a clue what you are saying, but each battery is 6000mah, and times that by 4 to get 24000mah
#4
04-30-15, 05:11 AM
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I know of no AA sized battery that contains 6000mah of energy. A AA NiMh can have up to about 2500mah and a lithium AA (14500 size) contains less than 1000mah but at higher voltage.
#5
04-30-15, 05:39 AM
Hi Fate,
You will need some form of energy input, mechanical, solar, or stored capacity from a traditional power source. Even if your battery has 6,000 mah, that is at 1.2 volts. If you run the batteries in series so the voltage adds, as PJ stated, you can't add the current. If you connect the batteries in parallel to add the current, you can't add the voltages. In any case you want to "massively extend that time period" which will need more input.
Now, 1 watt isn't very much and there are motion devices or crank devices that would allow you to recharge when you are away from the power grid. Just walking around might generate enough power for what you want.
Bud
You will need some form of energy input, mechanical, solar, or stored capacity from a traditional power source. Even if your battery has 6,000 mah, that is at 1.2 volts. If you run the batteries in series so the voltage adds, as PJ stated, you can't add the current. If you connect the batteries in parallel to add the current, you can't add the voltages. In any case you want to "massively extend that time period" which will need more input.
Now, 1 watt isn't very much and there are motion devices or crank devices that would allow you to recharge when you are away from the power grid. Just walking around might generate enough power for what you want.
Bud
