6
Connecting power
All National Luna Portable refrigerators can accept
a DC voltage ranging from 9.6V to 31.5V, as well as
an AC voltage range from 85V to 265V.
Both power inputs are fuse protected :
- 3.15A Time-lag fuse for AC input.
- 15A automotive blade fuse for DC input.
An AC and DC source can be connected to the
refrigerator simultaneously. Under these conditions,
the AC supply will be chosen as the primary power
source.
If the AC supply is interrupted, the DC supply will be
automatically selected and operation will continue
normally. (After a 1 minute delay)
Fuse (15amp)
Fuse 3.15amp
(5x20 Glass Fuse)
Suggested Wiring Specifications
One of the most problematic issues with installing a 12-volt refrigeration system is incorrect wiring.
Most users do not understand the importance of maintaining battery voltage over the distance from
the battery to the installed fridge.
While most car cigarette lighter sockets appear to be adequate, in practise a large voltage drop
occurs between the socket and the car battery. This may result in the fridge shutting down as a
result of a low-voltage condition.
It is recommended the following table be used as a guide to establish what cable thickness is to be
used depending on the distance from the car battery to the fridge. As a rule of thumb one should
use a 1.0 mm
2
multi-strand copper wire per meter of distance from the battery.
Note:
Two wires (positive and negative) must be connected from the battery to the fridge / plug point.
Cable Size
Max Length between battery & fridge
Cross Section
mm
2
12 Volt Operation
Meters
24 Volt Operation
Meters
4
4
8
6
6
12
10
10
20
