Battery Rating

Roughly speaking, if you double the load to 360A, it will only supply it for 30 minutes.

The rating is the product of the current and the time. It's only approximate, because some types of battery are better at higher discharge rates and some better at lower rates.

Please check the Voltamps of the battery. If it is a 12Volt battery the voltamps is 2160VA. You can connect a load of 1.84kW. If you are connecting more load to the battery the battery will not take . It will discharge immediately and the purpose will not solve

the rate of a battery is given for a 20 hours discharge, 180AH battery with 9 amp load will discharge in 20 hours,

efficiency will be reduced with higher discharge current, for 180 amp a standard battery may stay for only 30 minutes,

for 360 amp it stay only for 10 minutes

you can check specifications of each battery type from vendor

The "standard" amp hour rate is set against a 20 minute benchmark.

Or a projection based on the energy delivered for the first 20 minutes.

Generally in this Ah range it's a guideline for cranking engines.

Other amp hour rating systems apply to 'deep cycle' cells, use longer times, and give different numbers. Typically "2 hour rate" and "8 hour rate".

So the answer is no; it will not give necessarily 180 amps for an hour. It fact such a load may damage it.

If you need to know what a particular cell will yield, you need to get the manufactures discharge rate curves.

I like an answer that is better constructed, referenced and complete than mine GA

Also to Phaddy - GA for a good bit of 'extra understanding'.

Ah / A drawn = hours ....A = amps Ah = battery rating

A battery has an internal resistance, which dissipates energy. The more current drawn the greater the loss, and it is a greater proportion of the energy delivered.

eg if the battery volts is 10V and internal resistance is 1 Ohm, and you have a load of 9 Ohms, then the apparent terminal volts under load is 9V. The battery dissipates 1W and the load 9W.

eg if you now have a load of 1 Ohm, the apparent terminal volts under load is 5V, the battery dissipates 25W and load 25W.

Of course when you charge the battery, some charge heats up the battery, because of the internal resistance, so you can't push too many amps into it.

You have received some really good and accurate answers here, I do not see any need to improve on what has already been said.

But you want to be careful when "sizing" batteries for a particular job as going by the factory infos will probably mean that within a year, the battery will be discharging too far and consequently, the speed of damage to the battery will increase dramatically......

To avoid this, never charge above say 13.4 volts (assuming a 12 volt battery).

If its a car type battery (as against leisure), never leave discharged for long below 12.6 volts.

Never "completely" discharge a car type battery, it may not ever recover. Even leisure batteries do not take kindly to being fully discharged regularly....

Plan to have at least twice as much stored electricity available as you actually need, remember that if you only charge to 13.4 volts, the battery is only around 70% charged, not 100%!! So buy batteries with at least twice the capacity you calculated as a general rule. More is better.

Never gas a battery, remember that gassing produces a gas that can be ignited by the tiniest spark and send bits of a battery in many directions in a very short space of time!!!

Wear proper safety equipment/clothes, have the right things available for a leak or if you get the acid on your body etc., know where they are kept and follow all the rules for avoiding explosions.

Manufacturers can often help with proper safety infos.....

if load increae battrey operating time perid increase becouse load curent increase