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Free sample lab

Work a real service call from the solar track

This is not a demo built for a sales page. It is one of the graded diagnosis labs from the Solar Technical Training — Foundations to Field Mastery, unchanged. Commit to the checks you would actually make, and the grader will tell you what a seasoned technician would have done with the same call.

Graded in your browser. No account is created, nothing is recorded, and no progress or certificate is affected.

String inverters — operation & service · String inverter faults and what they really mean

Diagnosis labNo attempts yet

String inverter fault call

On site

A 5 kW residential multi-MPPT string inverter logs 'Isolation resistance low' most mornings between 07:00 and 09:30, then runs normally all day. Production is down about 9% month over month. The roof is nine years old and the array has two strings. A previous visit has already told the homeowner the inverter needs replacing, and the quote is sitting in their inbox.

Select the checks and actions that belong in this visit.

Component callout

Wet-morning isolation call — replacement already suggestedTwo strings, 9-year-old roofInverter, multi-MPPT123
  1. 1Damp DC runFault present 07:00–09:30, clears when dry.
  2. 2Isolation codePhotograph it with the timestamp.
  3. 3Replacement quoteAn assumption, not evidence.
The scene you are working in.

What the full track adds

  • Every module in the track, with safety, sequence and checklist labs alongside diagnosis calls.
  • Saved progress and attempt history, so you can see which judgment is still shaky.
  • The four-stage capstone on one continuous hybrid system, and the certificate that follows it.
  • Printable commissioning sheets and service reports you can use on real jobs.
Enrol in the solar track — $697Read the full syllabus

What do you want to train?

Tell us the work you need to cover. Training here is prep — exams and licences come from the examining body in your region.

After the labs, you know which exam to book

  • After the labs, you know which exam to book. Prep here for EPRA, NABCEP, EPA 608, NATE, CEC, SAQCC Gas and ESSCI, then book with that body when the labs are done.
  • EcoPowerHub Academy is the prep and issues its own completion record. The examining body is the issuer of the credential you sit for.
  • Work on photovoltaic, battery, and electrical systems involves potentially lethal voltages and must only be performed by qualified persons, in accordance with applicable codes, regulations, and employer safety programs.
  • Labs and materials are educational. The technician and their employer remain solely responsible for safe work practices, isolation, PPE, and compliance on actual jobs.
  • Exam and licence fees are paid to the examining body. Academy completion is training.