We understand that you may have questions regarding the information on our website. Below you can find Frequently Asked Questions. We would also gladly speak with you personally; please consult our contact page for details on how to contact us.

Which services and/or tests does SolarTester perform exactly?

Our range of services is tailored to the various stages a PV project goes through. This page provides a clear overview of that.

How quickly will I receive my report?

We strive to deliver the testing report the day after the test.

Where can I have the testing performed?

With our unique mobile tester, we can come to any location to conduct the tests. In the case of existing roof projects, the panels will have to be removed, so that we can test them on the ground. The client will be responsible for that.

Can you also test in the field?

Generally we can test anywhere. Naturally, when we test in the field, it’s important that the surface is accessible for our van and trailer.

As client, what do I have to provide to make on-site testing possible?

On the Downloads page, you can find a clear instructions document (click here). To summarise what we expect from our client:

  • Support for the operator
  • Panels removed from their packaging
  • Power outlet if possible
  • If the weather is poor, provide a tent if possible (with an opening of at least 3.1 metres in height), a heater to warm up the panels, or an indoor location

What criteria are applied to assess the panels?

SolarTester applies the criteria from version 3.4 which was created by the manufacturer MBJ from Germany in collaboration with TUV. If it is preferred, we can also agree to different criteria for the test results to come to the desired assessment. Please feel free to contact the SolarTester team for more information. Criteria 3.4 can also be downloaded here.

What standards for the assessment criteria are used in the industry?

In general, they accept 5% classification B module and 0% C or D module within a project (based on the MBJ criteria version 3.4). This percentage can be determined in consultation with the client. SolarTester applies the ISO 2859-1 standard to determine the sample size for the project and applies the Acceptable Quality Limit (AQL) in order to determine how many models within the sample test may be classified as B, C, and/or D.

How do I determine the sample size for the test?

SolarTester applies the ISO 2859-1 standard to determine the sample size for the project. More information regarding this is available on this page.

How soon can you come by for testing?

That depends on our schedule, but generally we’re always able to find room to conduct a timely test. Thanks to our full-time operators, we are quite flexible if short-term testing is required, or if we have to scale-up testing after disappointing test results.

How long does a test take?

Depending on the number of panels to be tested, we take into account a start-up and clean-up time, and we’re able to test about 30 modules per hour. This number may vary. We will gladly discuss the amount of time we need to perform the sets with the client.

What is the minimum number of panels that you will test?

Generally there is no minimum. Our rates are volume-based, with the rates becoming lower as the number of panels increases. In the case of a smaller number (such as less than 20 panels) will perform the test as well as another test in the region on the same day.

What is the maximum number of panels you can test per day?

That varies, but we generally expect about 150 to 200 modules.

Can you test any type of panel?

Yes, thanks to our extensive experience, we can test any type of panel. No challenge is too big!

Can you also test after installation?

Yes, SolarTester offers a complete range of quality checks, including a number that are performed after installation. We will gladly discuss what the best inspection method is for your situation. Every check has pros and cons, and the best possible test result is paramount for us.

How accurate is your power measurement?

Our power measurement is among the most accurate ones currently possible. Our mobile tester 3.0 XL has a measuring accuracy of 98%. With the help of calibration modules, the accuracy can even be pushed to about 99%.

Do you use calibration modules?

It’s certainly an option, depending on the client’s wishes. Our tester is calibrated annually. The client has the option to use a calibration module during the test to get the most accurate measuring results possible. SolarTester can arrange such a calibration module, or the client can provide one himself.

On the basis of what data have you composed your criteria?

MBJ version 3.4 has been composed based on years of market knowledge from a variety of aspects, including installation firms, manufacturers, and research organisations such as TUV.

Do you also test when weather conditions are poor?

Yes, weather conditions only play a role if the outside temperature is below 10 degrees. The modules have to be tested at temperatures between 10 and 40 degrees Celsius. If it’s colder outside, the client will have to provide a (pre)heated testing environment. This can be an indoor location (such as a warehouse) or a raised tent with heater.
If the wind force is >6, we can only test indoors.

Do you also remove the panels from the roof or farm?

No, our operator does not handle the panels. On the one hand this is to let our operators focus on their work, and on the other hand, it is to prevent debates if damage is found during testing. The client will also be responsible for preparing for the test by having the panels ready for testing (with any packaging materials removed).