3.4 Power connection
Wire size
The four large power terminals are sized for 14-2AWG(2.5-3.5mm
2
) wire. The terminals are rated
for copper and aluminum conductors. Use UL-listed Class B 300 Volt stranded wire only. Good
system design generally requires large conductor wires for solar module and battery connections
that limit voltage drop losses to 2% or less.
Minimum Wire Size
The table below provides the recommended minimum wire size allowed for the charger. Wire
types rated for 75
℃
and 90
℃
are listed.
Recommended wire size:
Typical Amperage
Wire Type
75
℃
Wire
90
℃
Wire
80A
Copper
4 AWG(25 mm
2
)
6 AWG(16 mm
2
)
Aluminum
2 AWG(35 mm
2
)
4 AWG(25 mm
2
)
Overcurrent Protection and Disconnects
CAUTION:
Circuit breakers or fuses must be installed in both battery and solar circuits.
The battery circuit breaker or fuse must be rated to 125% of the maximum current or more. The
recommended breaker/fuse rating for use with the charger is listed in the below table.
recommended breaker rating:
Minimum battery circuit breaker / fuse rating
1.25
×
80Amps=100.0Amps
A disconnect is required for the battery and solar circuits to provide means for removing power
from the charger. Double pole switches or breakers are convenient for disconnecting both solar
and battery conductors simultaneously.
Connect the Power Wires
WARNING:Shock Hazard
The solar modules can produce open-circuit voltage in excess of 100Vdc when in sunlight. Verify
if solar input breaker or disconnect has been opened(disconnected) before connecting system
wires.
（
common negative
）
Connect terminals by following below steps(Refer to diagram above):
1. Make sure that the system input and output disconnect switches are both turned off before
connecting power wires to the charger. There are no disconnecting switches inside the charger.
2. Make 4 power wires first. Remove insulation sleeve 10.5mm and the conductor should be
