To connect two panels a terminal block of eight is used. A terminal for the positive and negative of each panel, each of which is then connected to another terminal.
1. The top of the block has the inputs. To the left, the larger black cables with blue and red tape to indicate polarity, and to the right a brown and blue mains electric style wires.
* The negative outputs are connected to the respective controllers and there is a blue wire that joins the negative of both solar panels and controllers.
* The positive outputs are the red wires going to the two double terminal blocks immediately below.
The two blocks below take the positive output from the main block via the red wires. The outputs of each are wired to a) the input terminal of the controllers and b) to battery output of the controllers to bypass an feed directly to the batteries. The selection being done manually by moving the red input wires.
**Alternative arrangements for the solar inputs are:**
1. In parallel: Take the red output wire from one panel and connect it to the spare terminal at the bottom adjacent to and connected to the other output.
* In cloudy weather this gives increased output to be used with the controller or can be done to overcharge (equalise) batteries when the controller doesn't have that function.
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* In series: Only used when the cloud cover is very low and the combined voltage is below 75v the maximum for the Victron 75 | 15