Discussion in 'Home Power and Microgeneration' started by Antipodean Bucket Farmer, Oct 2, 2005.

1. ### Antipodean Bucket FarmerGuest

Hi, Everybody,

Let's say that I want to make a small 12-volt battery
supply. So I use a pair of cheap 6-volt sealed gel
cells, in series.

Each of the two batteries is rated at, say,
5 Amp-Hours.

Will they add together, for a total of 10 Amp-Hours?
Or will the pair just provide 5 AH at the higher
voltage (I.e. 12-volts)?

Thanks...

2. ### GeekBoyGuest

yes that is correct as voltage and amp are inverse of each other. As the
voltage increases the amperage decreases.

Try 4 batteries in series-parallel.
,>>

3. ### VaughnGuest

HUH? Actually, current (amperage) is directly proportional to voltage and
inversly proportional to resistance.
I (current) = E (voltage) / R (resistance)

Vaughn

4. ### Ralph CameronGuest

Each cell is rated at 5 AH so in series they will provide double the voltage
but the same 5 AH.

If you parallel them you'll get 6V at 10AH

5. ### VaughnGuest

Just noticed that someone x-posted this thread. You can read any further
responses from me at alt.energy.homepower

Vaughn

6. ### VaughnGuest

Wrong. You are thinking about the power formula P = I X E

If you were to apply 220 volts to your 110 volt hairdryer, you would (for a
brief amount of time) have 16.66 amps and be producing 4000 watts of heat.
Shortly thereafter, the "magic smoke" would come out, and your hair dryer would
be toast. Current is proportional to voltage and always has been. Read up on
George Ohm's theory.

What you are trying to say is that a 220 volt 1000 watt heater will have half
the current (and twice the resistance) of a 110 volt 1000 watt heater. (P = I X
E) but I is still proportional to E.

Vaughn

7. ### Steve SpenceGuest

Two 6v 5ah in series is 12v 5ah.
Two 6v 5ah in parallel is 6v 10ah.

8. ### Steve SpenceGuest

um, no. please try again. you are thinking of loads in watts.

9. ### VaughnGuest

I think we are done.

Vaughn

10. ### Steve SpenceGuest

No, you missed it completely.

11. ### Steve SpenceGuest

Well, that has nothing to do with batteries in series or parallel. You
applied one concept to an unrelated problem.

12. ### Steve SpenceGuest

Now you've got it.

13. ### K.A.MGuest

Here are some wonderful handy BATTERY wiring diagrams for battery BANKS
Series & parallel

Kevin