The Goal Zero Yeti 400 solar generator is a great buy that offers long-lasting service to its users. It is a versatile model that most people use in the day to day lives.

However, sometimes you might encounter certain difficulties and you need to understand how to sort them out. One of the most frequently asked questions when it comes to the Goal Zero Yeti 400 is why the ac is not working?

So, Why is Goal Zero Yeti 400 Ac not working? The Goal Zero Yeti Ac might not be working due to insufficient charge, faulty inverter, capacitor wear, or over and under-voltage. Go through the full article to get rid of this problem.

In this article, I will take you through all the reasons why your Goal Zero Yeti 400 ac is not working and how to solve the issues.

Let’s get started so that you can get back to using your Goal Zero Yeti 400.

Goal Zero Yeti 400 ac not working – Possible Causes and Fixes

1. Insufficient charge

Your ac may not be working due to insufficient charge. Now, when there is enough charge on your Goal Zero Yeti 400, there should be a small power reading indicated by the display.

Should there be no reading then you have insufficient power and you need to charge your device? Below are the three methods that you can use to charge your device.

Charging from solar

The easiest way to charge your Yeti 400 is by using a solar panel. Your Yeti’s charging port should be situated on the top-left corner with a blue ring around it.

The 8mm port is designed to work with several solar panels including the Goal Zero solar panels which take up to 120W of solar.

Start by placing your solar panels in a position that guarantees direct sunlight. Your solar panels need to get as much sunlight as possible for efficient and fast charging.

You can then plug the panel into the charging port of your YETI 400. You will know your device is charging when you see the blue LED light next to the INPUT port lighting up.

The LCD battery display should equally begin blinking and will only stop when the device is fully charged.

Some of the Goal Zero solar panels are chainable to ensure that they provide more power to your device and, therefore reduce the charge time.

However, should you have the old Boulder and Nomad solar panels then you must use the Legacy-Nomad adapter cable.

The 8.00mm to 8.00mm adapter cable equally does a good job.

Charging from the socket

Your YETI 400 has an included AC wall charger that you will need to plug into your wall outlet.

The blue LED light should turn on and the battery display starts blinking once you switch on the socket.

The recharge time on a wall socket is about 5 hours.

However, you have already realized that your AC wall charger comes in two different pieces.

You need to connect the two pieces by plugging the first cable into the box of the second cable.

Charging from the car

You can also charge your YETI 400 from a 12V source or your car. However, you will have to buy an 8.00mm to 12V charger.

2. Faulty inverter

Sometimes, the problem might be the inverter inside your Goal Zero Yeti 400. This device is considered exemplary because it produces AC power rather than most batteries which produce only DC power.

There is a pure-sine-wave inverter incorporated into your device to convert DC power to Ac while giving the same output as your home’s wall outlet.

The inverter may be faulty and this is caused by two reasons; electro-mechanical wears on capacitors and overuse, or over-and-under voltage.

Capacitor wear

For smooth power output, inverters rely on the capacitors at varying current levels. What most people don’t know is that electrolytic capacitors have a limited lifespan and age much faster than the dry components!

Capacitors are equally sensitive to high temperatures which greatly reduce their lifespan.

You need to ensure that you regularly change the capacitors and keep a consistent temperature maintenance regime to keep your inverter working effectively.


Sometimes you might be using your Goal Zero Yeti 400 beyond its operating limit which could damage your inverter. Once your inverter gets damaged you won’t get any ac power.

You need to ensure that you use your device within the operating limit to increase its lifespan.

Avoiding the issue of overuse is rather simple and all you need to do is ensure that you use the device as stipulated by the manufacturer.

Do not unnecessarily overwork your device and cause it to malfunction and break down.

over-and-under voltage

Over-current and under-current will lead to inverter failure and consequently ac failure. Once either the voltage or current increases beyond the rated level, it will damage components in your device.

The spike in current or voltage will lead to the generation of excess heat which will damage the inverter bridge.

Circuit breakers and fuses are ideal for dealing with over-current, while over-voltage can be hard to deal with.

Over-and under-current issues are usually frequent when you charge your YETI 400 using the wall socket.

Ensure that you always use a fuse or circuit breakers to ensure your device doesn’t get damaged when charging.


The Goal Zero Yeti 400 is a versatile tool that you should probably have. However, you need to practice proper care and maintenance to get long-lasting service from your device.

One of the biggest issues that might affect your YETI 400 is prolonged periods without use. Don’t let your device sit around the house not getting used because this could lead to damages.

Ensure you at least charge it frequently and keep it ‘ON’ just for a couple of hours.

Related Questions

How much is Goal Zero Yeti lithium battery charge cycle? When a battery goes from 100 percent to 0 percent, it is called a complete charge cycle. The Goal Zero lithium batteries can go upto 500-800 life cycles.

What batteries does Goal Zero use? The Goal zero uses Nickel Metal Hydride (NiMH), Li-NMC and Sealed Lead Acid (AGM Lead-Acid) batteries. These are the best batteries used in a solar power gernerators.

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