Electrician guide

From module to panel in six tasks. Modules form DC strings into the central inverter; protected AC then feeds the panel.

During a grid outage the system does not power the house. The inverter shuts down by code. Backup needs the battery plan.

Isolate and prove it is dead

Before you continue: A module in sun is live even when disconnected.

Stop and call: if there is no RCD or no earth electrode.

Group modules into the strings shown on the inverter plan.
Mate MC4s in series. Respect polarity and do not mix strings.
Measure voltage and polarity on every string before the home run. Label both ends.

Before you continue: Every string matches the plan, is inside the inverter range, and is labelled.

Stop and call: if a connector will not lock or water entered a module box.

Run each positive and negative home run in UV-rated conduit, with no outdoor splices.
Install the DC isolator and protections shown on the single-line drawing.
Land each string on its labelled inverter MPPT and gland the conduit entry.

Before you continue: Every string lands on the planned MPPT and can be isolated before the inverter.

Before you continue: The RCD trips on its test button.

Stop and call: if the main panel has no space or cable size is wrong.

Before you continue: Reading under 10 ohm.

Stop and call: if the house has no electrode or it is broken.

Before you continue: Every string reports generation and the inverter shuts down when the grid opens.

Stop and call: if a string does not report or the inverter does not shut down.

Sample junior electrician guide. Confirm protections and cable sizes on every job.