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# Battery watt-hour

## Battery watt-hour

(OP)
I found a battery PLX12-360

It says 360W per cell....12v

How do convert this to common Ah ?

In some document I saw 90Ah per battery no calculations
How do you calculate this watt to aH?

Replies continue below

### RE: Battery watt-hour

Sorry but you seem to missing the basic concepts.

Watts is a measure of power.
Ah (amp hours) is a measure of energy when combined with voltage.

Your question is akin to saying, "my car can go 60 miles per hour how far is that?".
With the given info it can't be calculated at all.

Same with your question, you cannot calculate the amp-hours from the watts.

Furthermore your numbers don't look right. A 90Ah battery will dish out a heck of a lot more current than 360W. Probably 20 to 40 times more.

Furthermore yet, there are no batteries with a cell voltage of 12V.

I suggest you hunt down that battery's specification sheet. If you can't find one then recycle the battery because it's too old to be worth your time.

Keith Cress
kcress - http://www.flaminsystems.com

### RE: Battery watt-hour

I used Google - a lot of the fault is with the battery spec which include W/Cell.

One thing they spec is time - how many watts the lead acid battery can produce in 5, 10, and 15 minute spans - they are sold for UPS units, so that makes some sense. His size is listed on the Leoch website at 90Ahr. I don't see there any indication of the number of cells is in the Watts-per-cell (WPC) category; it may be a mistranslation, but they have a sales number in their literature that might be used to find out.

(corrected company name spelling)

### RE: Battery watt-hour

Thanks guys for that info boost.

Alms88; There's nothing to calculate. The spec sheet states that battery is 90AHrs at the standard rate of 10 hours.

If you mean what is the 20Hr rate? Then it's always more than the 10Hr rate and in this case it's 95.6AHr. (Their number is wrong - typo.)

Keith Cress
kcress - http://www.flaminsystems.com

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