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B DC Fuse or Circuit Breaker
• DC-rated fuse or DC-rated circuit breaker connected along the DC positive line is required.
Fuse/Circuit Breaker
Rating
• Based on the size of the Battery Bank, determine the overall short circuit current rating of
the battery bank from the battery manufacturer. The fuse or circuit breaker has to be able
to withstand the short circuit current that can be supplied by the battery bank.
• For battery banks with total capacity under 500Ah the most affordable ANL fuse type can
be used. Otherwise use Class-T type.
C DC Disconnect Switch
• A DC Disconnect Switch connected along the DC positive line is recommended. The
rating of the switch is with the same or higher rating of the selected fuse or circuit breaker.
Use ignition protected switches when required by local codes.
• This switch is used to disconnect the positive of the battery bank to the unit's positive
terminal during maintenance/repair service, when not in use, or when troubleshooting.
It could also be an A/B/A+B/OFF type switch to select either one of the two or both
(paralleling) battery banks (if available).
D DC Input Cable
• All DC Input Wires should be insulated multi-strand low resistance wires.
• The DC wires must be copper and with minimum 105
Model
24V 2000W series
24V 3000W series
The typically recommended wire length is limited to 5 feet or less for each of the positive and the nega-
tive. For longer wires, a proportionally thicker gauge is required to compensate for additional voltage drop
CAUTION: These guidelines assume you are using the DC supplied cable
and fuse sizes recommended in this manual. The use of a thinner gauge
in the DC wires may cause the inverter to trigger the under-voltage shut
down under heavy load conditions. It may also melt the wire insulation
and catch fire, resulting in death or serious injury. The choice of the wire
gauge should also match or exceed the ampacity rating of the DC fuse
and holder being used.
WhisperPower Inverter / Battery Charger
24V 2000W System
150Adc
Thinnest DC Input Wires Gauge Used
≤ 1.5 m / ≤ 5 feet
≤ 2.25 m / ≤ 7.5 feet
(Recommended)
55 mm
2
/
AWG # 1/0
70 mm
2
/
AWG # 2/0
24V 3000W System
200Adc
rating.
o
≤ 3 m / ≤ 10 feet
70 mm
2
/
95 mm
AWG # 2/0
AWG # 3/0
95 mm
2
/
120 mm
AWG # 3/0
AWG # 4/0
11
2
/
2
/
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