Solar Power Answers
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Wiring Tips

If you have electrical experience then wiring up your solar power system should be straightforward. Although the wiring is likely to be more complicated than normal mains wiring, all the principles involved are the same. This page gives an outline of the differences between this type of wiring and normal wiring.

Caution: If you are at all unsure of your abilities please employ a qualified electrician, preferably one with experience of wiring renewable energy systems.

Warning: In some countries, notably the UK, regulations prohibit un-qualified persons from connecting certain things to the mains without certification.

DC Wiring

12 Volt Lighting The DC wiring may be the whole system or confined to the battery room. Every system is different, but I have provided example wiring diagrams for a typical 12 Volt lighting system and 230 Volt system to help with the wiring design. The cable sizes can be calculated using the calculator on the design page but be aware that the low-voltage DC cables will need to be larger than you are used to. Normal mains wiring accessories can usually be used at their rated current at up to 30 Volts DC. You will also need some specialised low-voltage parts such as battery clamps which can be obtained from automotive wiring suppliers.

AC Wiring

230 Volt System The AC wiring is just the same as in any mains installation. It is very important that the manufacturer's instructions are closely followed when installing the inverter, especially with regard to earthing requirements. Always ensure that the AC and DC circuits are kept entirely separate.