Copyright 2013 HotSpot Energy
CONNECTING POWER CABLES
ELECTRICAL WORK
MAKE SURE TO USE SHIELDED WIRE FOR WIRING THE COMMUNICATIONS CABLE BETWEEN INDOOR
AND OUTDOOR UNIT
The following is a general guide. FOLLOW NEC FOR ALL WIRING.
1. If there is a safety problem with installing the 48 VDC AC unit, the technician should refuse to
install the air conditioner and explain to the customer that the problem must be resolved before
continuing the installation.
2. Power voltage should be in the range of 46v to 58v DC.
3. Ensure the air conditioner, panels, charging system, and batteries are properly grounded.
4. All components shall be installed in accordance with National Electrical Code.
5. Do not install the air conditioner in a wet room such as a bath room or laundry room.
6. A disconnection capability must exist on or between the charge controller and battery bank. A DC
rated disconnect should be used between the battery bank and the AC unit in accordance with the
NEC.
7. Keep the unit at least 36” away from combustible materials.
8. Refer to the Electrical Connection Diagram located on the panel of the indoor & outdoor unit to
connect the wires. All wiring must comply with local and national electrical codes and be installed by
a qualified electrician.
MINIMUM WIRE SIZE (AWG: American Wire Gauge)
You can use a voltage drop calculator to determine the minimum AWG based on the voltage , amps,
and distance. There is a wire size/voltage drop calculator at http://www.calculator.net/voltage-drop-
calculator.html
Allowable Voltage Drop (%):
The percentage of voltage drop acceptable. This is typically allowed to
be 5% or lower in ELV systems. HotSpot recommends <3% voltage drop.
Rated Current :
Per AS4509.2 as "The maximum 30 minute average of apparent power or DC power
consumption (measured in volt-amperes for AC and watts for DC)". We calculate based on the
maximum current that the cable is to carry.
ELV System Voltage:
The nominal system voltage is 48 volts for the HotSpot DC4812VRF DC air
conditioner. The nominal system voltage for the PV/charge controller configuration will depend on the
string sizing. HotSpot assumes PV string voltage of 100v for its AWG recommendations.
FOLLOW THE NEC AND USE THE GUIDE ON PAGE 11 FOR PROPER AWG SIZING.
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