So I'm wondering: if I instead put the 6 batteries in parallel (getting 1.3v-1.5v) and then use a charge pump to go up to 5v, will I get both 5v and 6 times the capacity? (ignore charge pump losses)Or am I breaking some law of physics here, and both methods give the same capacity?
My initial thought was to power it with 6xAAA batteries + linear regulator.
That is how it works, MAH capacity in series is same as single cell, in parallel the sum of their individual MAH capacity.
Either way, the total energy in the batteries is the same and when they're dead that's how much energy you will have extracted.
Hooking the batteries in series will give you a voltage equal to the total voltage of all the batteries, but the Ah and current carrying capacity of only one. For example, three 12v 20 Ah batteries in series will give you 36v 20 Ah. If each battery could put out 200 amps max, then three in series will put out only 200 amps max.
Quote That is how it works, MAH capacity in series is same as single cell, in parallel the sum of their individual MAH capacity.That doesn't seem right - I think you are confusing the battery's energy capacity (mAh) and the current that can be delivered. If you have, for example, 6 1.5V 1200mAh batteries you will get a total of 7200mAh out of them no matter how they're connected.If they are in series, you get 9V at whatever current a single battery can deliver.If they are all in parallel, you get 1.5V but you can draw six times as much current.Either way, the total energy in the batteries is the same and when they're dead that's how much energy you will have extracted.Pete
Or am I breaking some law of physics here, and both methods give the same capacity?
Hi,I was interested in this thread because I'm thinking of a solar-powered arduino application. If you had a small solar panel with variable output voltage something like this seems ideal. Does the variable resistor tune the output based on a fixed/known input like your pack of cells, or does it tune the output based on an internal reference voltage it achieves therefore making it suitable for random acts of sunlight?My initial thought was to have the solar panel charge a battery, which in turn runs the Arduino & sensors, but with this could I avoid the middle-man (for daylight operations only obviously) ?Thanks