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Adding voltage and current from different devices? Answered

How do you add the output from devices which are generating distinct voltage and currents? Two windmills for example or a windmill and a solar cell.

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Udon
Udon

11 years ago

Yeah that's a good question. I also don't know. Maybe we should try it out for ourselves - treat the whole power supply like a battery, output and common, in series with another one. I wanted to try it with more than one jewel thief. Might work. Um. Or not...

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mkcimini
mkcimini

Answer 11 years ago

Hoping that a power supply person might know. The knowledge should be out there somewhere.

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lemonie
lemonie

Answer 11 years ago

You can isolate the sources from each other with diodes, but what are you using and what do they / will they feed-into?

L

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mkcimini
mkcimini

Answer 11 years ago

Feeding a battery. But wondering what is the best way to add devices that are of different V and I.

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lemonie
lemonie

Answer 11 years ago

You might need some kind of voltage multiplier to get up to the 14-17V, but you could arrange like this L

pwr.bmp
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mkcimini
mkcimini

Answer 11 years ago

So you are suggesting a voltage regulator to get each source to a reference voltage and then connect them to the battery?

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lemonie
lemonie

Answer 11 years ago

I guess that is what I'm suggesting, but I don't know what you've actually got to build this with at the moment. L

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robotguy4
robotguy4

11 years ago

Hmmmm... Hold on... I may know a simple formula for this one...

-=ACHTUNG!=-
I'm a theoretical guy, so I suggest you receive a confirmation about this before you calculate and use it. You would need to use a diode for the solar panels, I think.

First, learn about series and parallel circuits.
Adding voltages in series:
v1+v2=vtotal

Adding voltages in parallels:
1/(1/v1+1/v2)=vtotal

I forget how you determine the current. It is very likely that you could treat these as regular power sources (batteries) with variable voltages.

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mkcimini
mkcimini

Answer 11 years ago

But to charge a battery you want to keep the voltage around 14 to 17 volts. So is it better to put them into series or parallel and then convert to required voltage? For arguments sake lets say s small field of wind turbines each having different motors, charging a battery bank.

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robotguy4
robotguy4

Answer 11 years ago

Oh... Wait... You want to CHARGE BATTERIES? I thought you just wanted to run something off them. Oh, yeah. Thats different from what I was saying. Disregard what I was saying.