Inspecting the field of photovoltaic modules

The aim of the inspection is to check that the modules are solidly fixed and facing in the right direction, and that the electrical connections are correct.

Mechanical test

The solidity of the configuration is checked and all the screws are inspected for tightness.

Visual inspection of the overall condition and cleanliness of the modules and to check that the junction boxes and PCUs are watertight.

Electrical test

Using a multimeter, a series of electrical measurements are taken in the various PCUs
to check that the wiring is sound. These measurements are taken with
the overall switch in the 'on' position.

The operator measures each module open circuit voltage (upstream from the anti-return diodes). If the modules are correctly exposed to the sun, all voltages should be close to the rated open circuit voltage given by the manufacturer.

The short-circuit current in each module can also be measured to check in particular that the measured current values are consistent.

Inspecting the storage cells

These checks are carried out before the battery is charged, i.e. with the overall switch in the 'on' position.

Visual inspection

The condition of the battery should be inspected visually to check for the presence of accessories and to check electrolyte levels and the cleanliness of the storage cells.

Measurements

The density and voltage of each component should be measured and logged on the inspection sheet. The temperature of a component will also act as a benchmark for analysis. It is important that measurements are consistent.
Contact the distributor if a component gives a totally different reading. These measurements will serve as a basis for future maintenance visits.

The state of charge of the battery is decided by comparison with supplier graphs.