8
House (12-volt) System
8
battery banks support 12-volt DC power: 1) port engine battery 2) starboard engine battery 3) house
battery bank 4) Inverter bank (Thrusters) 5) Generator battery
House Battery Bank & Switch
The HOUSE BATTERY BANK provides power for all DC systems, except the engines and 3 automatic
bilge pumps. When disconnected from shore power, all 12-volt devices drain the house battery. Use devices
as needed. The DC voltmeter on the DC panel can be switched between Port, Starboard, and House Battery
banks to measure charging or resting battery voltages.
When a battery bank is being charged, the voltage will read from about 13.1 volts to 14.4 volts depending
upon state-of-charge of the battery bank. When the battery bank is at rest, (that is, not being charged), the
voltmeter can give a rough indication of the state-of-charge of the battery bank.
Inverter and start batteries are charged by the engine ALTERNATORS while underway. The engine/house
batteries are charged by the BATTERY CHARGER when connected to shore power. Ensure the Battery
Charger and Inverter circuit breakers at the electrical panel are ON. The GENERATOR will also charge the
batteries
(if applicable otherwise delete this sentence.)
Voltage (Wet Cell Battery)
Battery State
12.65 volts
100%
12.47 volts
75%
12.25 volts
50%
11.95 volts
25%
11.70 volts
0%
Battery Parallel Switch
Each ENGINE BATTERY is connected to its corresponding engine. However, should one engine battery be
insufficiently charged to start its engine, the other engine battery may be momentarily connected to provide a
boost. Press the BATTERY PARALLEL SWITCH located starboard aft engine room. Turn off after the
engines start up..
