Do you always wonder when your battery will run out of power, and always wait until it has been dead for a while before charging it? This seriously affects the service life of the battery, below we will introduce you to the running time of 12v battery and related issues in order to solve your doubts.

1.How long does a 12v battery with inverter last?

For different kinds and brands of 12v battery plus inverter, they will also have different use time mainly because of the capacity of the 12v battery or the total power of the load, which leads to different use time of the 12v battery, below we will introduce the use time of the 12v battery for you specifically.

1.1 Calculate the battery capacity

You should firstly look for the label of the battery from the top or side of the battery, if the label on the battery has the capacity of the battery, you can use it. But because the efficiency of the inverter also affects the accuracy of the calculation, we also need to know the efficiency of the inverter. We can use the following formula to calculate the battery power capacity.

Battery power capacity = Battery capacity * Voltage * Efficiency of inverter

For example, if your battery capacity is 200Ah, then your 12 volt battery capacity is 12V x 200Ah = 2400Wh.

1.2 Battery Running Time

You need to observe your load power to calculate, generally we calculate in hours as running time, you have to use the following formula.

Running time = battery capacity / total power

For example, the total power of your appliances and inverter is 200W, then the battery running time is 2400Wh/200W=12h, i.e., your battery can work under a load of 200W for 12h. However, the calculation is theoretical, and the actual situation may also be related to the number of years of use of the battery, and generally we use the above calculations will be shorter than the actual running time.

2. Three parameters that affect the operating time of 12V battery with inverter

Capacity of 12V battery:

12V battery only indicates that the output voltage of the battery is 12V, the capacity of the battery is not determined. The larger the capacity of the 12V battery, the longer the running time of the 12V battery with inverter will be. the exact capacity of the 12V battery varies according to the size and specifications.

The power generation depth of a 12V battery

The power generation depth is the ratio of the amount of power that can be released from the battery to its totais capacity. Generally, the generation depth of lead-acid batteries is most suitable at 80%, which does not affect its service life. Lithium-ion batteries can reach 99% of the generating depth, the specific 12V battery generating depth will also be related to the brand of the battery.

Total power of the load plus inverter

The total power of the load plus inverter is equivalent to the rate of energy consumption per unit of time. The total power of the inverter is the energy of the circuit inside the inverter per unit of time and the energy consumed per unit of time when the inverter is working. The total power of the load is the power consumed by all the appliances connected with the inverter.

After understanding these three factors and accurately calculating the load power, you can roughly estimate how long your 12V battery can run.

Conclusion:

The theoretical value of how long a 12V battery can run is calculable, and we can use this theoretical value to roughly estimate when the battery has been recharged.