Solar Base

Commissioning test record

Record the string tests as you take them, see anything that looks off, and print or save a signed sheet for the job file.

Your own tolerance against the expected Voc
String tests
StringModulesVoc expected (V)Voc measured (V)Isc (A)PolarityIR + to earth (MΩ)IR − to earth (MΩ)Check
1OK
2–
3–
Strings All recorded strings OK 1 string recorded
String 1OK
String 2–
String 3–

Print or save as PDF to keep a copy on the job file. Nothing on this page is sent anywhere.

How it's worked out

Each measured Voc is compared with the Voc you expect for that string at the time of the test, and anything further off than your tolerance is flagged, as is a string whose polarity is not confirmed.

A record template. The tests and the values an install must meet come from AS/NZS 5033, AS/NZS 3000 and the inverter maker's instructions. Checked 21 October 2026.

Solar Base keeps every job on one record, from the first enquiry to the meter alteration, and does the portal work for you. See how it works

Why compare against the expected Voc

A string's open-circuit voltage should be close to the module Voc times the number of modules, adjusted for the cell temperature at the time of the test. A reading well under that points to a missing or reversed module, or one wired into the wrong string, and it is much cheaper to find on the day than on a callback.

Questions installers ask

Should the expected Voc be adjusted for temperature?

Yes. Work it out for the cell temperature at the time of the test with the string voltage calculator, or the reading will look off on a cold or a hot day when nothing is wrong.

Is this sheet a compliance certificate?

No. It is a record of your tests. Certificates of electrical safety and the documents your network asks for are separate.

A tool does one sum. Solar Base does the whole job.

The STC count, the NMI, the meter alteration and the invoice, worked off one job record, with the last step left to you.

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