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1. Safety Tips
• Please ensure the instructions are read prior to any installation.
• Keep instructions in a safe place for future reference.
• SC420 and SC440 are designed for indoor use only
• Beware of any nearby electrical equipment that may interfere with installing this device.
Do not connect any AC sources to the controller as it may cause a fire/explosion and will permanently
damage the device.
• Always check the battery polarities before making a connection. The positive terminal of a battery goes
into BAT+ and the negative into BAT-.
• The controller is not designed to run without a battery voltage reference. In the event of replacing
servicing the battery, always disconnect the solar input first (or fully cover the panels), then replace/
service the battery.
• Solar panels can generate high voltages and currents, make sure your solar panels are completely
covered from sunlight during installation.
• Keep this product out of reach of children.
• Always install a fuse on both the input positive and output positive circuit.
• Connecting wires to this device can generate sparks, please wear proper insulation gear
while installing this device.
• This controller is a negative grounded (positive switching) type.
• Always take the total length of wire into consideration and use the correct wire size, see below for a
table of recommended wire size for various current loads.
• Lead acid batteries can be dangerous. Ensure no sparks or flames are present when working near
batteries.
Solar Input Current
Wire Cross Section Area (mm
Wire AWG
5A
)
1.5
2
15
10A
20A
2.5
5
13
10
30A
40A
8
10
8
7
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