Wiring Specifications; Connection - opti-solar SC MPPT series User Manual

5.3 Wiring Specifications

Wiring and installation methods must comply with national and local electrical specifications.
The wiring specifications of the solar, battery and loads must be selected according to rated currents, and see the
following table for wiring specifications:
Model Rated
charging
current
SC-20MPPT 20A
SC-40MPPT 40A
The wire size is only for reference. If there is a long distance between the PV array and the controller or between the
controller and the battery, larger wires can be used to reduce the voltage drop and improve performance.

5.4 Connection

We strongly recommend connecting a fuse directly to the battery to protect any short circuit at the battery wiring.
Solar PV modules create current whenever light strikes them. The current created varies with the light intensity, but even
in the case of low levels of light, full voltage is given by the modules. So, protect the solar modules from incident light
during installation. Never touch uninsulated cable ends, use only insulated tools, and make sure that the wire diameter is
in accordance with the expected currents of solar charge controller. Connections must always be made in the sequence
described below.
Rated Solar wire
discharging diameter(mm' /AWG)
current
20A 5/10
30A 10/8
Battery wire
diameter(mm' /AWG)
5/10
10/8
10
Load wire
diameter(mm' /AWG)
5/10
6/9