Small Scale Offgrid Solar PV: Installation Manual
To switch off the bulb the switch disconnects the positive line in the circuit. Therefore every
bulb socket has to be prepared with:
Switch cable - middle connection terminal (the other cable from the switch is connected
to the Positive of the DC Distribution line.)
Cable connected to the Negative of the DC distribution line – connection terminal on the
side.
These cables need to comply with the Quetsol Technical guide: Cable Selection in small Offgrid
Solar Energy Installations
Obviously it will be necessary to first verify the distance to the position of the switch to avoid
connecting a wire that‟s too short to the bulb socket. It‟s better to minimise cable splices in the
whole installation; each cable joint increases the total load on the battery.
3. Install the bulb sockets and connect to the negative distribution line.
The bulb socket has holes so that it can be screwed to a beam. To install it to a concrete roof
wall-plugs and screws will be necessary. Ensure the cables aren‟t caught behind its edge during
installation. If necessary cut out a small cable channel with pliers
For connections to the main Distribution line it‟s preferable to join to the continuous wire
without cutting it (rather than splicing the ends.) The steps are explained below.
How to connect to a cable without cutting it (twin 2-core cable.)
Separate the 2 wires with 2 pliers without damaging the insulation. Allow enough room for the
insulation tape to pass through.
Cut the insulation of one cable all the way round (without damaging the copper.)
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