Panels are only part of a solar system. The electrical work that connects them to the property decides whether the system is safe, reliable and easy to live with. Green Solar Solutions wires and integrates DC and AC inverters, smart meters, main consumer units and grid-tied configurations.
From the roof to the consumer unit
The DC cables run from the panels to an isolator and then to the inverter. From the inverter, an AC cable goes to the consumer unit, where the solar supply has its own protective device. Each cable is chosen for the current it carries, routed so that it is protected from damage and fixed where it cannot be disturbed. The installation is carried out to the IET Wiring Regulations, BS 7671, which has a section on solar PV supply systems.
Choosing and placing the inverter
The inverter converts the DC from the panels into AC and sits between the roof and the consumer unit. Manufacturers state where an inverter can be mounted: a cool, ventilated, accessible position, away from heat and damp. Its position affects cable lengths and the access for later checks, so it is agreed together with the cable route. A hybrid inverter is chosen where the system includes a battery.
The consumer unit
The condition of the existing consumer unit matters, because the solar supply is connected through it. It needs space for the extra protective device and the protection that the current regulations expect, and it has to be in a fit state to carry on being used. Some properties keep their existing unit; others need it improved or replaced. This is decided by looking at it.
Metering and the grid
Energy going in and out of the property is measured. Depending on the system, this can include a generation meter and a smart meter that records exports. A system that connects to the network also has to be notified to, or approved by, the local network operator, depending on its size. Export payments, for example under the Smart Export Guarantee, depend on the supplier’s terms and can have requirements about how the system is installed, so it is worth checking these before choosing a tariff.
Labelling and isolation
The installation can be isolated and clearly labelled, so that anyone working on the property’s electrics, or attending an emergency, can see that there is solar on the premises and how to switch it off.