How can a 12V 80Ah Battery be 1800W? Shouldn't it be 960W?
I was looking for 12V 80Ah Deep Cycle Batteries on Amazon and most of them were 1800W. Like this one: https://www.amazon.com/Cycle-Battery-RENOGY-SOLAR-PANELS/dp/B0143K89KA/ref=sr_1_fkmrnull_3

 

Pay attention to units. There's a difference between watts and watt hours.

The battery could be thought of as having a nominal rating of 960WH. It could also be capable of delivering 1800W for some time. It depends on the peak current the battery can provide.

 

Ah is a measurement of how long a battery will last, if the specified amperage is drawn from it.

So in your example, you could draw 1A for 80 hours. Or 80A for 1 hour. Or 160A for 30 minutes...

In the last case, it depends on if the battery can even supply 160A. The wattage rating depends on this value. Working backwards from the 1800W rating, I get a max amperage draw of 12.25A.

At 12.25A on a 80Ah battery, I get a run time of 6.5 hours. And that’s down to zero volts. In reality, the battery would become useless in far less time.

 

The wattage rating depends on this value. Working backwards from the 1800W rating, I get a max amperage draw of 12.25A.

How? If it's 12V and 1800W, shouldn't it be 150A? 12V * 150A = 1800W.

Sorry for the silly question, I'm a total noob!

 

How? If it's 12V and 1800W, shouldn't it be 150A? 12V * 150A = 1800W.

Your calculation is correct. That's why I said it would depend on whether the battery could provide that much current.