Installation Guide

65
Multiple panels/strings in parallel
A parallel connection is achieved by joining all of the positive (+) and negative (-) nodes together.
When placing panels in parallel, it is recommended that the voltage levels are within specification.
In other words, the V
mp
(maximum power voltage) of the panels must all be within 10% of each
other. Typically, connecting panels in parallel is achieved through using identical panels. A
simple way to place panels/strings in parallel is by using a branch connector, shown in Figure
8.1.
Figure 8.1 Pair of MC4 Branch Connectors
Caution!
Remember to always use the recommended gauge size based on the total
array current. Sizing the cable incorrectly may result in melting wires and/or fire.
8.1 Two adjacent panels in parallel (12V systems)
Figure 8.2 Two RNG-100D Panels in parallel
One of the most basic solar configurations involves wiring two solar panels in parallel. This parallel
configuration will increase the current output while the output voltage remains the same. Fig. 8.2
above shows the arrangement for connecting two solar panels in parallel with one pair of MC4
Branch Connectors. This arrangement is applicable if two solar panels will be mounted adjacent
to one another. This connection requires one (1) pair of MC4 Branch Connectors. When the
panels are mounted at different locations- that is, separated by a distance, the panels must be
extended with MC4 Extension Cables (sold separately).