YACHT ARABELLA
POWER CONSUMPTION CHARTS
CHART 1
(SIX HOURS DAYLIGHT SAILING)
|
Item |
Avg draw (amps) at 12V |
Avg use (hours/day) |
Avg 12V consumption (amp-hours/day) |
|
|
Raystar 125 GPS |
0.1 |
6 |
0.6 |
|
|
ST60+ instruments (4) |
0.2 |
6 |
1.2 |
|
|
Silva S10 VHF Radio |
Listening |
0.9 |
5.8 |
5.2 |
|
Transmit |
5.0 |
0.2 |
1 |
|
|
Nasa Navtex |
0.05 |
6 |
0.3 |
|
|
Nasa AIS |
0.05 |
6 |
0.3 |
|
|
Autopilot (TP10 or TP300CX) |
Standby |
0.06 |
2 |
0.12 |
|
In Use |
0.5 |
2 |
1 |
|
|
TOTAL 12V CONSUMPTION (AMP-HOURS) |
9.72 |
|||
AVERAGE HOURLY CONSUMPTION (AMPS PER HOUR) ASSUMING ABOVE USAGE = 1.6 AMPS
AVERAGE HOURLY CONSUMPTION (AMPS PER HOUR) ASSUMING AUTOPILOT IS ACTIVATED = 1.9 AMPS
CHART 2
(SIX HOURS NIGHT-TIME SAILING)
Item
|
Avg draw (amps) at 12V |
Avg use (hours/night) |
Avg 12V consumption (amp-hours/night) |
|
|
Running lights (2) |
0.4 |
6 |
2.4 |
|
|
Red light to Nav Station |
0.5 |
1.5 |
0.75 |
|
|
Raystar 125 GPS |
0.1 |
6 |
0.6 |
|
|
ST60+ instruments (4) |
0.2 |
6 |
1.2 |
|
|
Sea-Me RTE |
Standby |
0.15 |
5 |
0.75 |
|
Transmit |
0.35 |
1 |
0.35 |
|
|
Silva S10 VHF Radio |
Listening |
0.9 |
5.8 |
5.2 |
|
Transmit |
5.0 |
0.2 |
1 |
|
|
Nasa Navtex |
0.05 |
6 |
0.3 |
|
|
Nasa AIS |
0.05 |
6 |
0.3 |
|
|
Autopilot (TP10 or TP300CX) |
Standby |
0.06 |
2 |
0.12 |
|
In Use |
0.5 |
2 |
1 |
|
|
TOTAL 12V CONSUMPTION (AMP-HOURS) |
13.97 |
|||
AVERAGE HOURLY CONSUMPTION (AMPS PER HOUR) ASSUMING ABOVE USAGE = 2.3 AMPS
AVERAGE HOURLY CONSUMPTION (AMPS PER HOUR) ASSUMING AUTOPILOT IS ACTIVATED = 2.8 AMPS
CHART 3
POWER CONSUMPTION FIGURES
(BY ITEM)
|
Item |
Consumption |
|
|
Running lights – Plastimo 1 NM (bow red/green) |
165 mA |
|
|
Running lights – Hella 2NM (stern white), 2W |
165 mA |
|
|
Tricolor – Aqua Signal series 32, 4.5W |
400 mA |
|
|
Red light to Nav Station (LED) |
500 mA |
|
Raystar 125 GPS
|
100 mA |
|
|
ST60+ (1) |
45 mA |
|
|
Nasa Navtex |
50 mA (100 mA with backlight) |
|
|
Nasa AIS |
50mA (100 mA with backlight) |
|
|
Sea-Me RTE |
Standby |
150 mA |
|
Transmit |
350 mA |
|
|
Silva S10 VHF |
Listening |
900 mA |
|
Transmit |
5 Amps |
|
|
TP10 or TP300CX Autopilot |
Standby |
60 mA |
|
Auto |
500 mA |
|
All data from manufacturers’ handbooks (or direct enquiry to manufacturer) unless otherwise stated.
YACHT ARABELLA
POWER SUPPLY AND CHARGING DATA
(disregarding 240v shorepower/charger)
Battery Capacity
115 Ah
Assume 50% maximum availability = 57.5 Amps
Tohatsu 6HP Charging Circuit
12V, 60W = 5 Amps per hour
Fuel capacity (external tank): 12 litres (2.64 gallons)
Consumption: 2.5 litres/hour (0.55 gallons/hour) – wide open (4.8 hours max)
Solara 120M (34W) Solar Panel (permanently connected)
Volts (max): 16.5
Amps (max): 2.06 Amps per hour
Amps per day (assuming 4 hours charge per day and 80% efficiency): 6.6A
YACHT ARABELLA
BATTERY STATE OF CHARGE (UNDER LOAD)
1. Read battery voltage from ST60+ graphics repeater at nav station (scroll through to Environment Menu).
2. Refer to table below for voltages as related to depth of discharge. This chart is designed to be used when monitoring the battery under load (i.e. as shown on the ST60+).
|
Voltage |
State of charge |
|
12.6+ |
100% |
|
12.5 |
90% |
|
12.42 |
80% |
|
12.32 |
70% |
|
12.2 |
60% |
|
12.06 |
50% |
|
11.9 |
40% |
|
11.75 |
30% |
|
11.58 |
20% |
|
11.31 |
10% |
|
10.5 |
0 |
Notes
(a) The voltage reading will be probably be slightly high, caused by a phenomenon called "surface charge” as the solar panels are permanently connected.