Use cases by sector
Self-consumption and small installations
The installation goes up in days and the documentation stays with the building for twenty years.
A self-consumption installation is a short project with long consequences: it goes up in a few days, and the documentation it generates is needed every time the building is sold, a warranty is claimed, maintenance is contracted or the supply account holder changes.
What remains once the installer leaves
| Document | What it is for later | Who holds it if you do not ask |
|---|---|---|
| Installation certificate | Evidences it was done and with what specification | The installer, and only them |
| Registration paperwork | Justifies the installation to whoever asks | Split between installer and agent |
| Equipment datasheets and warranties | Claiming when something fails under warranty | The installer, or the manufacturer |
| Photos of the installation work | Seeing what lies behind what is no longer visible | Nobody, unless someone took them |
Important
The fourth row looks dispensable and is the most appreciated five years on. Once installed, much of the system stops being accessible: conduits, fixings, whatever sits behind a panel. **Half a dozen photos taken during the work are worth more than twice as many pages of technical specification** when something must be repaired or extended.
What to require before paying the final invoice
- 1
The certificate and registration paperwork, complete
It is the only lever: once paid, the installer's priorities move on.
- 2
Warranties with their start date
Usually commissioning, not equipment purchase.
- 3
The as-installed layout and the photos
Ask explicitly: hardly any installer hands them over unprompted.
- 4
And who maintains it and how often
Even if you decide not to contract it: knowing what should be checked is already useful.
Watch out
The detail that surfaces on sale or letting: **the installation is part of the building and its documentation transfers with it**. A buyer or their bank may ask for it, and not having it can complicate or delay the transaction for a reason nobody associates with panels fitted six years ago. It is the building-manual argument applied to something installed afterwards.
During the installation's life
Worth knowing
Which procedures, certificates and notifications each installation requires depend on capacity, type and region, and they get updated. **Your installer or engineer confirms that**; this describes which documentation is worth gathering and keeping whatever procedure applies to you.
›What if the previous owner installed it?
Ask for whatever exists at purchase: reconstructing it later is expensive and sometimes impossible.
›Does the invoice count as evidence?
As expenditure yes; as evidence of the installation, no.
›Is this needed for a small installation?
The volume of paper is smaller, but the problem at sale is identical.
A real case
The situation
A company sells a warehouse and the buyer asks for the solar documentation.
What you do
- On the next installation, requires certificate, registration and photos before the final payment
What you get
The documentation travels with the building and the deal is not held up by a years-old paper.
The situation
A solar installer delivers thirty systems a year and each legalisation file is built from scratch.
What you do
- Saves the complete process as a template
- Requests what depends on the customer on day one
- Checks what is missing per installation before filing
What you get
The thirty-first installation is processed in a fraction of the time the first took.
The situation
A customer document is missing and the filing stalls.
What you do
- Requests what depends on them when the contract is signed
What you get
The wait runs in parallel with the works.
The situation
The customer asks for the documentation years later for a grant.
What you do
- Keeps the complete file with its date
What you get
The request is met without reconstructing.
The situation
A component is replaced and the documentation stays the same.
What you do
- Updates the file with every change
What you get
The paper describes what is installed.
The situation
Installation photos stay on a phone.
What you do
- Uploads them to the file at the moment
What you get
The evidence outlives the handset.
The situation
Later maintenance does not know what was installed.
What you do
- Stores the file with the installation
What you get
Whoever maintains it finds what went in.
The situation
Each technician documents differently.
What you do
- Uses the same template for everyone
What you get
The files are comparable.
This article answers
- self-consumption installation documentation
- solar panel legalisation paperwork
- photovoltaic installation certificate
- what to keep from a solar installation