Questions for Running Time

How Long Your Appliance Will Operate On Your Battery?

For a 12 Volt System: 

 (10 x (Battery Capacity in Amp Hours) / (Load Power in Watts)) / 2 = Run Time in Hours 

 For a 24 Volt System: 

 (20 x (Battery Capacity in Amp Hours) / (Load Power in Watts)) / 2 = Run Time in Hours 

Tip: Deep cycle (marine) batteries generally have the highest reserve ratings. They are also capable of withstanding repeated drains of power and recharging. 

Tip: Engine start batteries should not be discharged below 90% charged state, and marine deep cycle batteries should not be discharged below 50% charged state. Doing so will shorten the life of the battery based on most battery manufacturers recommendations. 

Note: If you intend to use power tools for commercial use, or any load of 200W for more than 1 hour regularly (between battery recharging) we recommend installing an auxiliary battery to provide power to the inverter. This battery should be a deep cycle type and sized to meet your run time expectations with the engine off. The auxiliary battery should be connected to the alternator through an isolator module to prevent the inverter from discharging the engine start battery when the engine is off.

How long will my battery power supply last before it goes dead?

That depends on a lot of variables such as the state of your battery and the amount of power you use. The heavier the demand, the quicker it will drain your battery. Experimenting with your setup is the best way to determine what you will need to do. 

If your battery goes dead too soon for your desired application, you can take one of the following actions to extend your operating time: 

Start you car engine for about 10 minutes to recharge the battery or just keep it running while you are using the inverter. Use your volt meter to keep an eye on the battery level.Attach several batteries together in parallel.Attach a solar charger to your battery source.

How long can I operate my inverter?

The runtime (i.e., amount of time that the inverter will power connected electronics) depends on the amount of battery power available and the load that it is supporting.In general, as you increase the load (e.g., plug in more equipment) your runtime will decrease. However, you can attach more batteries to extend the runtime. There is no limit to the number of batteries that can be connected.

How long can I expect my devices to run?

The run time depends solely on the amount and size (capacity) of your batteries. 

FORMULA:Total the amps on your batteries and divide by 12. Take that number and set it aside, we’ll get back to it in a moment.Total the amps on the devices you will use on the inverter, add another 1/2 amp for the inverter itself.Take THAT total and divide into the first number you came up with.The result will be your runtime in hours. The more batteries you put in parallel the longer runtime you can expect.

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