What size power station do I need?

You only notice it when the power runs out in the middle of something important. The cool box gets warm, your phone is at 8%, and the light in the awning dies just as the evening is getting good. The question "how big a power station do I need" is therefore not just about technology. It's about how freely and comfortably you want to use your car, roof tent, or camp setup.

For many, the choice ends up being too small or unnecessarily large. The small model seems cheap and easy, but can quickly feel limiting. The large model looks strong on paper, but takes up more space, weighs more, and costs more than your actual use requires. The right choice is usually somewhere in between - and it depends entirely on how you travel.

How big a power station do I need for my use?

The short answer is that you should choose based on three things: what devices you want to use, how long you want to be away without charging, and how much weight and space you are willing to allocate in the car. Many only look at the capacity in Wh, but that's only half the story. You also need to look at how many watts the unit can deliver at once.

Wh tells you how much energy you have stored. Watts tells you how powerful devices you can run. For example, if you want to run a laptop, charge phones, and keep a compressor cool box going, capacity is most important. If you also want to use an electric kettle, coffee machine, or hairdryer, the maximum output quickly becomes crucial.

As a rule of thumb, small power stations are best suited for short trips and light electronics. The mid-range is often the best choice for car camping and weekend trips. The larger models make sense if you want to be more self-sufficient, use power-hungry equipment, or stay in the same place for several days.

Start with your actual power consumption

The safest way to make the right purchase is to calculate your needs. Not as a big engineering project, but as a realistic list of the equipment you actually use. A mobile phone uses relatively little. A cool box uses much more over a 24-hour period. A coffee machine can use a lot of power in a short time.

Let's take a typical setup for a couple on a weekend trip. Two phones, some lights, charging a camera or drone, and a 12V compressor cool box. Here, it's rarely the phones that throw off the calculation. It's the cool box, because it runs for many hours, even if it's not drawing full power all the time.

If you also use a laptop for work on the go, an electric pump for inflatable equipment, or a small projector for movies in the roof tent, the need quickly increases. That's why many miss the mark when they only look at the biggest consumers at the moment and forget the total daily consumption.

A simple way to think about it is this: Multiply the device's wattage by the number of hours you expect to use it. This gives you an approximate number in Wh. Then add up your devices and add a little extra, because there are always losses along the way, and reality rarely follows the plan exactly.

What uses the most power at camp?

If you're new to car camping, it can be difficult to figure out what actually sips power. Small things like phones, headlamps, and smartwatches barely register in the calculation. However, cool boxes, CPAP machines, laptop charging, heated blankets, and especially appliances with heating elements do.

This is also where many are surprised. A power station can have plenty of capacity for a weekend, but still not be able to power a specific coffee machine because the appliance requires too high a peak power. Conversely, a powerful power station with high output can still be a poor solution if the capacity is too small for several days' consumption.

Therefore, you should not only ask how big a power station you need. You should also ask what you want to be able to turn on simultaneously, and whether you want to charge on the go from your car, solar panels, or 230V.

Three typical sizes and who they are suitable for

A small power station of about 200-300 Wh is well suited for those who take short trips, sleep a single night, or primarily want to keep small devices running. It is easy to pack, quick to take with you, and obvious as extra power in the car. However, it is rarely enough if you want to run a cool box throughout the weekend.

The mid-range of approximately 500-1000 Wh is the sweet spot for many. Here you get a solution that can cover most common needs on a road trip, in a tent, or by the car. You can typically keep a cool box, phones, lights, and smaller electronics alive without constantly feeling pressured by the battery. For couples and small families, this is often where the investment provides the most freedom for the money.

The larger models from around 1000 Wh and up are for those who want to do more and for longer. They make sense for longer stays, more equipment, working on the go, or power-hungry appliances. But you don't just pay in money. You also pay in kilograms and space, and that matters if you pack a passenger car tightly to the roof.

How big a power station do I need for a cool box?

The cool box is often the most important test because it changes the entire experience of being away. Cold food, fresh produce, and less dependence on kiosks and petrol stations make a big difference. But a cool box draws power over a long period, and it is precisely that long period that determines the capacity requirement.

A typical compressor cool box does not run constantly, but it starts and stops depending on temperature, contents, and weather. On a mild Danish weekend, it uses significantly less power than on a hot summer day in the sun. If you want to be on the safe side, a medium-sized power station is often a good starting point for a cool box on short to medium-long trips.

If the cool box is your most important appliance, it also makes sense to think about charging on the go. If you drive every day, car charging can make a significant difference. If you stay still in the same place for a long time, solar panels become much more interesting. In practice, this can mean that you can choose a smaller power station because you continuously replenish it.

Don't forget charging time

Many people only focus on battery size, but charging time is almost as important. If you can charge quickly at home or at a campsite, you can more easily live with a smaller model. If you primarily rely on the car's 12V socket, it will be slower, and then a larger buffer can be nice to have.

Solar panels sound like the perfect solution, and they can be really powerful in the right setup. But they are also weather-dependent. Danish summer can be fantastic - or grey for three days. Therefore, it is rarely smart to dimension your power station based on perfect sun conditions alone.

The best setup is often one where the power station and charging options fit together. Not necessarily the largest model, but the model that makes sense with your trips, your car, and the way you actually travel.

The classic mistake: buying for the dream and not for the trip

It's tempting to buy for the big future plan. The long trip to Norway. The month on the road. The perfect basecamp with all equipment turned on. But if your next 15 trips are actually weekend trips in Denmark, it's smarter to buy for the use you have now and for the near future.

At the same time, you shouldn't buy so narrowly that you feel stuck in three months. If you know that a cool box, lights, and charging are constant needs, and that you might also want to add a solar panel or work a little from the car, it can be worth going one step up from the minimum.

This is precisely where good advice makes a difference. At Offgridconnection, it makes the most sense to find a solution that matches your way of camping - not just the model with the most numbers on the box.

How to choose correctly the first time

Think comfort before capacity. What do you want to be free not to do without? If the answer is cold food, charged devices, and light in the evening, you're already close to knowing your needs. If you also want to be able to make coffee with electricity or use other high-power appliances, you need to pay extra attention to output.

Then think about the type of trip. An overnight stay, an extended weekend, and a week off-grid are three vastly different scenarios. The further you are from mains power, the more important the balance between battery size and the possibility of charging on the go becomes.

Finally, be honest about the space in the car. A power station shouldn't just be capable enough. It also needs to be realistic to bring along. The best equipment is what actually comes on the trip and is used without hassle.

If you're wondering how big a power station you need, don't choose based on the most extreme scenario. Choose based on the freedom you want to feel when you park, open the tailgate, and know that your setup just works.