Starr uses a combination of 120 and 240 volt AC, and 12 and 24 volt DC electrical power. In addition, there are two Victron inverters that allow for limited use of the boat without AC power, ie. "quiet" anchoring. Originally, most of the boat's lighting was 12 volt AC, supplied through 120 to 12 volt transformers located in the pilothouse. Now this has been changed to 24 volt DC. The DC system batteries are located along the forward bulkhead in the lazerette and under the pilothouse console.

Ships Ground System Diagram

AC SYSTEM

AC System The AC (Alternating Current) system supplies 120 and 240 volts throughout the boat. It is wired in a split buss configuration that allows two sources to be used simultaneously. This is usually the case when using shore power or when electrical demands exceed a single generator capacity.

The left side of the panel, called Load Group 1, includes the two left most vertical rows of AC breakers and is supplied by the horizontal set of breakers below. The right side, Load Group 2, includes the remaining three vertical rows of breakers and is supplied by the set of breakers below. Power to Load Group 1 can come from a shore power connection, the forward generator, or from Load Group 2. Load Group 2 power can be selected from a shore power connection, the aft generator, or Load Group 1. These "load groups" represent a set of breakers all connected to a common source or "buss". Only one source per buss can be selected at a time.

Balancing the load. Amps needed VS available.

AC power can be supplied from shore or onboard generators. Shore power is fed through isolation transformers and on to the engine room AC panel whereas generator power feeds directly to the panel. There are two sets of shore power connections, one in the cockpit and one on the foredeck. Each set consists of two 50 amp, 240-volt connections. The labeling on the foredeck is somewhat confusing but makes sense after a fashion. To explain, the engine room panel is marked using two methods, load group #1 and load group #2 and/or Port and Starboard. Take your pick. #1/Port represents the left side of the panel and #2/Starboard represents the right side of the panel.

From the bow or stern shore power connections power goes thru the main Engine Room panel (be careful when Shore power is hooked up, even if all switches are off, The line in the engine room panel is hot!) to the control box mounted in the lazarette directly aft of the hatch between the engine room and lazarette. In that box each shore power line terminates at a breaker, for a total of four inputs. The #1/Port pair supplies a single multi-tap transformer by way of a selector switch, and the same is true for the #2/Starboard pair. The rotary switch is used to select the input voltage. Input to the #1/port isolation transformer can be 190, 200, 220, 240, 380, 416, 440, or 480 volts. The selectable voltages for the starboard side are 190, 200, 208, 220, 380, 400, 416, or 440 volts. From the switch, power is fed to the engine room panel. Input and transformer output voltage can be read on the control box. Select the desired portion from the rotary switch below the meter.

Here is a step-by-step procedure: Shore Power Wiring Diagram :

Ensure all breakers in the lazarette are off

Plug in to the shore connection

Attach your cord to a connector on the bow or stern

Engage the breaker on the dock

In the lazarette, check what voltages are present on the cable

Select input voltage on rotary switch for the energized cable

Engage the breaker for the energized cable

Check transformer output voltage

In the engine room, engage the breaker on the engine room panel that has the lit LED. No LED means no power from shore

The following is a descreption of the Electrical panels

From left to right on the engine room panel:

Inverter buss (All 110v):

Fresh water pump

Refrigerator Freezer (boat deck) REMOVED 2001

Stereo

Fresh air fans & clocks

Computer

Icemaker (REMOVED 2001)

Flex lights

Inverter/Charger:

CHARGER input (one half of the breaker is used for each 120 volt inverter/charger)

House (Inverter output. Only half the breaker is used for each 120 volt inverter)

Below the left hand LOAD GROUP 1 horizontal breakers is a three position rotary switch which allows us to select the power source for the engine room fan, the davit and the washer/dryer. These three uses can be powered by either the batteries via the inverters or by shore power or generator sets.

Load Group One (two columns - center and center left, all 240v)

Air conditioning system

Guest cabin air conditioning controls

Davit

Spare

Engine room fan

Pilothouse feed

Washer/dryer

Salon heat & AC

Port cabin heat

Starboard cabin heat

Sea Recovery water maker

Vantage water maker & scuba air compressor

Load Group Two (two columns - right side, *110v units)

24 Volt MASTERVOLT battery charger

12 Volt battery charger

Air compressor*

Cockpit outlet*

Lazarette outlet* Engine room outlet*

BBQ

Lube oil pump

Water heater #1

Fuel exchange pump

Water heater #2

Bait tank(removed 2002}

Fresh water pump

Black water pump

Pilothouse AC panel

Microwave*

Pilot house outlet*

Trash compactor*

Garbage disposal*

Galley outlet*

Lighting transformers 1-5*

Lighting transformers 6-10*

Dishwasher*

Gallery heater

Pilothouse heater

Master heater

Captain heater

Vacuum*

Guest stateroom outlets*

Salon outlets*

Pilothouse and galley AC

Captain & Master AC

Alarm*

Mast & FB outlets*

Heater/Fan/Light Guest heads*

Heater/Fan/Light Captain & Master heads*

Instahot*

Flying bridge light*

Pilothouse battery charger*

ALL THE 12 VOLT AC LIGHTS ARE IN THE PROCESS OF BEING CONVERTED OVER TO 24 VOLT DC: 4/2004

Most of the 12-volt AC lighting transformers are located in the pilothouse just inside of the opening to the area under the console. Further in, around the corner to the left are fuses for all of these transformers. One transformer is unused and it's fuse is removed. Power for the pilothouse lights comes from transformers in the overhead above the pilothouse chair and power for the exterior lights comes from transformers in the overhead one panel to port of center.

DC SYSTEM

Starr has both 12 and 24-volt DC systems. The 24-volt house system has 8 Eight-D gel cell batteries located in the lazarette. From there power is distributed through a rotary switch to breakers located in the lazarette on the side of the battery box to the three warping winches, steering motor, and to the engine room and pilothouse 24-volt DC panels. Additional connections are made through a fuse to the inverter in the engine room and to the house/engine bank cross over switch. The fuse is located aft of the inverter, mounted on the hull.

An E-Meter is attached to the house bank and the display is on the DC panel in the engine room.

Two more Eight-D batteries are combined to create a 24-volt starting bank for the main engine. The starting bank may be paralleled with the house bank if needed using the rotary switch found in the lazarette.

Two group 27 batteries supply 12-volt start power to the generators, one each. These two batteries may be paralleled together if needed. The parallel switch is located between the two generators on the bulkhead, port side. A 12-volt charger mounted on the aft bulkhead of the engine room charges the generator start batteries but is a very poor charger and only use in an emergency. The alternator on the forward generator charges its starting battery and the alternator on the aft generator charges its own battery. There is a 24-volt Mastervolt charger on the aft engine room bulkhead.The controls are on the starbord side of the electrical panel. In general, charging of the 24-volt house bank comes from the Mastervolt , the Victron inverter/chargers and the 160 amp main engine alternator. The alternator also charges the engine start bank. If paralleled, the inverter can charge the engine start bank too. The DC Electrical System diagram found in the owner's book is correct except for the output of the 24-volt charger. It is, as discussed above, attached to the house bank, which is not shown on the diagram.

Engine room 24-Volt Panel:

Panel supply

Engine controls

Gray water pump

Tank tender

Thruster controls

Alarm system/ER Temp Alarm

Engine room DC lights

Head system control

Spare

Guest head DC lights

Fuel exchange system

Aft engine room bilge pump

Pump room bilge pump

Bulb bilge pump

Forward engine room bilge pump

6X Spare

E-Meter

Most of the boat's electronics run off of a 12-volt panel found in the pilothouse. Power for this panel comes from either a 24->12-volt converter found under the console or a Eightr-D Gel Cell battery collocated with the converter. This battery has its own charger, also located under the console. A rotary switch next to the battery switches between supplies.

Pilothouse 12-Volt Panel

Panel supply

Floscan

Canopy lights

Pilothouse VHF

Pilothouse GPS

Instrument lights

Barometer light

Flying bridge VHF

Flying bridge GPS

Sonar

Camera system

Radar (small)

Hailer

Link instruments

Spare

C Phone /Stove Gas Shutoff

Weather fax

TV antenna

Stereo/Crew Cabin

Depth sounder

SSB

Night sight

Pilothouse Rudder Angle Indicator

Boat deck (BBQ) 12volt supply - Sounder/RAI

Pilothouse 24-Volt Panel

Panel supply

3X Spare

Air horn

Navigation lights

Radar (Large)

Spare to overhead console

Crew head lights

Master head lights

Nera Inmarsat B

Autopilot Steering Control

9X Spare

4X spare

Video sounde

r Tank sentry

Stabilizer controls

12-Volt converter

16X Spare