03/18/2022

A 2000 watts inverter would require a 1000ah 12V battery. The 3000 watts inverter requires at least a 1500ah battery, and the 4000 watts inverter requires 2000ah. And finally, the 5000-watt inverter will support by a 2500ah 12V battery. Ensure you choose compatible batteries.

Battery capacity is calculated based on the load backup duration. So the inverter capacity would not be deciding factor battery capacity. The battery should have sufficient charge to meet the maximum power supply of the inverter.

For example, if your batteries deal with the load of 1200W on your inverter at 12 volts, 200ah may generate 2.4kWh energy that can power the appliance for an hour.

For this calculation, we are considering the max 50% utilization only. Moreover, there will be some wastage of energy during electricity transmission from one device to another.

Let assume your inverter input DC voltage is 12 volts only then you may require one or more batteries connected parallel to control the loads to the device.

If the batteries are starting working with 24 VDC, then you may require two batteries of 12 V.

Ensure that you offer the input of 24 volts or use the two different sets of the 4 batteries to meet the requirement.

Pair it according to prescribed by the inverter manufacturer. Control the voltage limit to 24v for improving the backup duration of the battery.

The 3000-watt inverter with a 20 amp battery will produce 12 volt DC to 110 Volt AC. As a thumb rule, the flooded cell batteries will require double the charge that is 6000 watts. The efficiency of the battery plays an essential role.

Few battery manufacturers offer significant battery component that lasts longer. It would be hard to find the batteries that can handle the constant discharge rate of C1.

The battery with the C1 indicates, the battery draws 3KW from 3KW batteries and has a shorter life span.

Several factors affect the battery’s efficiency. The number of batteries required for the inverter will depend on the rated supply voltage of the inverter.

Let’s say you want to run a 4000 watts inverter which is a 4kW energy supply. It will draw a good amount of energy in the amps at 12 volts and 24 volts.

Presumably, you will connect the inverter to the 48 volts. Thus you may require 4 x 12-volt batteries in the series of connections to power the 4000 watts of the inverter.

It would be best to consider various factors while calculating the need for the batteries to power the 5000-watt inverter, such as the battery capacity, voltage, and active duration in the hours.

It is vital to know that how long you want to run the inverter. Batteries will have limited capacity.

It starts draining quickly once you connect the inverter. Even if no appliances are connected to the inverter, still the battery will keep drawing.

Comparative to the small-size battery backup, the large inverters are used for emergency purposes.

When you know the battery amps, it will become easy to identify the energy requirement of the inverter. A 5000-watt inverter would require a minimum 450 to 500 ah 12 V battery.

Alternatively, you can have two separate batteries of 210ah 12V that would power the system for 30 to 45 minutes.

If you demand to run the inverter for 1 hour, you would require 750ah 12 V batteries. As you extend the hours, more power supply would be needed in the backup.

The 4 hours of the operating system may need a 2500ah battery. Remember that you have to double the capacity each time you do not want to discharge the battery fully.

In the following example, we explain how the battery is consumed when connecting the inverter to the system. Let’s say you have a 5000-watt inverter with 12 V input.

The 5000-watt inverter would generate approx 416 amps an hour of energy. It is calculate as 5000W / 12 V = 416.

With this formula, you can tell how many amps you would require to power the inverter. Base on the figures, we can assume 450 to 500 ah battery can comfortably run the system for an hour.

Remember that the efficiency of the battery, inverter, and whole system would decide the final output. Some batteries are highly efficient in transferring energy.

The result may be slightly different than what we have presented in this example.

Additionally, during the transition process, some energy will be lost. The energy level decreases consistently, reducing the number of hours the system can run when connecting the 5000-watt inverter.

So, in this case, the battery that should sustain for one hour may work efficiently only for 30 to 45 minutes. Also, the figures changes when you consider the 24V, 36V, or 48V battery.

Battery Size Chat:

The inverter chart will tell you how much optimum capacity would have the particular size of the inverter. You can compare the values with the other inverters and choose a suitable size for your home equipment.

Energy drawn by the inverter varies depending on the size. The chat explains how much energy a particular inverter will draw.

The table is developed after analyzing the total capacity of the inverter. We are assuming that the battery is fully charged.

If you plan to recharge the battery up to 50%, then double the capacity for each column. We have considered the optimum capacity for four hours, and comparatively, the minimum capacity would be one hour.

Depending on the type of battery you will be using for the system, the depth of the discharge range will change. We have considered DOD at 100% capacity.

It is possible with lithium batteries. In the lead-acid batteries, the DOD drops significantly. You will get only 50% DOD to use.

These kinds of inverters and batteries are generally used in a solar-powered home. They offer a great facility to store and supply the energy smoothly to the house.

It is noticed that these batteries are less frequent in RVs.

You may find the batteries in large-size RVs, but small-size RVs may not be suitable for them. Ensure that the battery generates sufficient charge and ideal for the camper.

Do the calculation of voltage required to find the total energy requirement. If your consumption is higher, you may have to carry a pair of batteries to meet the demands.