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Upkeep Papers

Home systems · HS-13

Solar Panel and Inverter Log

A free printable solar panel log — generation and export meter readings month by month, alongside inverter faults, cleaning, shading notes and servicing.

First page of the Solar Panel and Inverter Log — Notice a system quietly under-performing, by keeping generation figures next to the faults, shading and cleaning that explain them.
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One page. Choose your paper size — both versions are laid out identically, so neither one gets shrunk to fit.

Print it and write on it

A4 44 kB US Letter 44 kB

Fill it in type and save

A4 122 kB US Letter 122 kB

The fillable versions have real form fields — open them in any PDF reader, type into them and save. Printing help.

What this sheet is for

Notice a system quietly under-performing, by keeping generation figures next to the faults, shading and cleaning that explain them.

Who it is for

Owners of a domestic solar PV system, and anyone taking one on with a property and no history for it.

How to use it

  1. Fill in the panel and inverter details once, from the units themselves.
  2. Read the generation and export meters on the same day each month.
  3. Record the reading as it appears, and work out the difference in the next column.
  4. Log every inverter fault code, cleaning, new shading and service visit as it happens.

What is on the sheet

One page, top to bottom:

Printed under the title: Generation and export readings for a solar PV system, alongside the inverter faults, cleaning, shading and servicing that explain why a month looks the way it does.

Same day, every month. Read the meters on the same day each month and write the weather beside the number. A generation figure on its own says very little; the same month a year apart, next to a note about shading or a dirty array, says a great deal.

Write-on lines: Property · System size · Commissioned · Panel make & model · Inverter make & model · Serial

Table, 13 rows: Date · Generation · Since last · Export · Inverter fault / code · Cleaning / shading · Service and notes

Questions

Why record cleaning and shading alongside the readings?

Because a low month is only informative if you know why. A new hedge, a dirty array or a fortnight of fog explains a drop that would otherwise look like a fault — and a drop with no explanation is the one to chase.

Should I write down the meter total or the monthly figure?

Write the total exactly as the meter shows it, then calculate the difference in the next column. Totals can be checked against the meter later; a monthly figure written on its own cannot.

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Also in the resources library

The same subject, with a version you can fill in on screen.

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