Samlex America SR1000-148 - Manual (Page 12)

SR Series Inverter
11
Dry Contact Terminal Relay
COM. Common contact
N.C. Normally closed contact
N.O. Normally open contact
3-1-7 . DC Input Connection:
Follow the instructions to connect the battery cables to the DC input
terminals of the inverter. The cables should be as short as possible
(less than 6 feet / 1.8 meters ideally) so that they can handle the
required current in accordance with the Electrical Codes and
Regulations. The size of the cable should be thick enough to limit the
voltage drop to less than 2% when carrying the maximum input current
to prevent frequent low-input voltage warnings, and shutdown. UVP
(Under Voltage Protection) warning may result if there is excessive
voltage drop across the DC cables between the batteries and the
inverter. Increasing your DC cable size will help improve the situation.
Batteries are capable of providing very large currents in case of short
circuit. In case there is a short circuit in the cable run between the
batteries and the input terminals of the inverter, it will result in
overheating / melting of the cables and consequent risk of fire and
injury, To prevent possibility of this hazard, use Very Fast Acting DC
Fuse in line with the positive cable. The fuse should be as close to the
positive battery terminal as possible. Use Bussmann ANN series fuses
( will also require Fuse Block 4164) or equivalent.
The following sizes of cables and fuses are recommended for up to 6 ft.
distance between the batteries and the inverter. (Applies to both 120
VAC and 230 VAC versions):
Model No Wire AWG Inline Fuse
SR1000-124 / 224 # 4 80 A
SR1000-148 / 248 # 6 40 A
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Connect DC input terminals to 24V / 48V battery or other DC power source.
[ + ] is positive, [ - ] is negative. Reverse polarity connection can blow the
internal fuse and may damage the inverter permanently.
WARNING!
Make sure that all the DC connections are tight (torque
to 9 – 10 ft-lbs, 11.7 – 13 Nm). Loose connections
could result in overheating and can be a potential
hazard.