# How Long Will a 12v Battery Last With Inverter?

If you’re planning to use an inverter to power your appliances, you might be wondering how long your battery will last. The answer isn’t straightforward because it depends on various factors such as the capacity of the battery, the size of the inverter, and the power consumption of the devices you’re running.

## How Long Will a Car Battery Run an Inverter?

If you’re using a car battery to power your inverter, the lifespan of the battery will depend on its capacity and the power consumption of the devices you’re running. Typically, a car battery has a capacity of around 50 Ah (amp-hours). If you’re running an inverter that draws 400 watts, you can expect your battery to last for around 1 hour before it needs to be recharged.

## How Long Will a 12 Volt Battery Last With a 400 Watt Inverter?

If you’re using a 12 volt deep cycle battery with a 400 watt inverter, the lifespan of the battery will depend on the capacity of the battery and the power consumption of the devices you’re running. Most 12 volt deep cycle batteries have a capacity of around 100 Ah. If you’re running an inverter that draws 400 watts, you can expect your battery to last for around 2 hours before it needs to be recharged.

## Will an Inverter Drain My Battery?

Yes, an inverter will drain your battery if it’s not connected to a power source for charging. Inverters convert DC power from batteries into AC power that can be used to power appliances. However, the conversion process is not 100% efficient, and some power is lost as heat. This means that an inverter will draw more power from your battery than the amount of power it’s supplying to your appliances.

## How Long Will a Car Battery Run a 400 Watt Inverter?

If you’re using a car battery to power a 400 watt inverter, you can expect the battery to last for around 1 hour before it needs to be recharged. However, this assumes that the battery is fully charged and that you’re not running any other devices that draw power from the battery. If you’re running other devices, the lifespan of the battery will be shorter.

## Conclusion

The lifespan of a battery powering an inverter depends on various factors, including the battery capacity, the size of the inverter, and the power consumption of the devices you’re running. It’s important to choose an inverter that matches your power needs and to monitor your battery’s charge level to avoid draining it completely.

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.