Calculate your energy consumption – and find the right solar cell solution

March 2, 2026

Many choose solar panels based on guesswork.

The result is often:

The right way is to start with your power consumption.

That is why I have created a simple power and solar calculator to help you find a solution that fits your setup.

The most important question is not:

“How big a panel do I need?”

But:

➡️ How much power do you use every day?

Typical onboard consumers:

Once you know your consumption, choosing a solar panel becomes much easier.

I have made a simple calculator that helps you figure out:

👉 Use the power and solar calculator here:

(The calculator is designed for boats, campers, and off-grid installations.)

A typical problem is looking at maximum watts instead of realistic production.

In Denmark, production is affected by:

Therefore, a little extra capacity often provides much more stable operation.

Even good panels can perform poorly without the right controller.

Benefits of MPPT:

This means more usable power in practice.

Can solar panels cover all my consumption?
Yes, many do just fine during the season with proper dimensioning.

Do solar panels work in cloudy weather?
Yes, but with lower output.

How much battery do I need?
It depends on how long you want to be without shore power — the calculator helps you estimate it.

If you are unsure about the result from the calculator, feel free to write:

Then I will help you find the right solution.

✔ More freedom without shore power
✔ Less engine or generator use
✔ Stable charging during the season
✔ More independent setup