Gemini 105Mc Owner’s Manual
15Copyright © 2004 Performance Cruising Inc.
Shore Power
Shore Power
The Gemini is wired for 110-volt shore power with a
30 amp current rating. The female plug on the comb-
ing behind the mainsheet traveler is 30 amps. We
suggest the use of a 50 foot shore power cable. Take
care to keep the cable clean, dry, and in good work-
ing order to avoid arcing between the plug prongs.
Caution: While rated for 30 amps, the shore power
plug should not have more that 24 amps running
through it continuously.
The color codes of the wires are:
Black: Live
White: Neutral
Green: Ground
The 110v circuit panel with breaker is just inside
the main door to port. The top of the panel has a
green light to indicate power coming into the boat.
A red light is located just below the green light and
will light if the external power source is incorrectly
wired. If the red light comes on, unplug from the
shore power outlet and try another outlet.
The top 2 switches are the main inlet switches rated
to 30 amp.
The switches under the main switches have differ-
ent ratings up to 20 amps.
Switch
Rating
Port Outlets (2)
10 amps
Starboard Outlets (4)
15 amps
Refrigerator
20 amps
Water Heater
15 amps
Air Conditioner / Spare
20 amps
There are duplex outlets in the head, master cabin,
galley, refrigerator area (close to main door), and
navigation area. The outlet by the navigation area is
ideally suited to plug in a battery charger.
The outlet in the navigation station and master bed-
room are GFI outlets. The navigation station outlet
protects the head outlet while the master bedroom
outlet protects the outlet in the galley.
Before connecting the shore power cord, always turn
the AC circuit breaker “Off.” Once connected,
switch the breaker “On.” Similarly, always remem-
ber to turn “Off” the AC circuit breaker before dis-
connecting the shore power cable.
Power Inverters
Power inverters transform battery supplied power
known as direct current (DC) into Alternating Current
(AC). An inverter is not available as a factory-
installed option but can be installed by a trained
marine electrician.
An inverter/battery charger must not be used when
the boat is connected to shore power. Today’s in-
verter is designed to take the shore power into it so
that it can sense if the shore power is on. Today’s
inverter is so quick that if there were to be a failure
on the incoming shore power the inverter would
switch over to battery without a computer failing. If
a high demand shore power item is installed such as
air conditioning that would take more power than
the inverter is capable of supplying, then a separate
line from the inlet should go to that appliance by-
passing the inverter. This is because the inverter
would try and supply the power necessary to run that
appliance if there were to be a shore power failure
and would keep over heating and shutting down.
When testing electronic equipment, be careful that
stray fields from the shore power cables do not influ-
ence sensitive equipment.
The wire used is 3-core, 10 gauge, 600º stranded
marine-grade cable.
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