inverting 12 Volts to operate the 120 Volt item. There is also a small efficiency
loss of about 10% when inverting. For example: When using the inverter to oper-
ate an AC electrical item, which has a current draw rating of 2 amps, the inverter
will use over 20 amps DC power from the batteries.
Determining Current Consumption:
First determine the amount of current
used by an AC item. For example: The television is rated at 200 watts at 120
Volts. Calculate watts to amps. Divide 200 watts by the operating voltage of 120,
this equals 1.6 amps. Multiply 1.6 amps AC current by a factor of ten the inverter
will use, this equals 16 amps DC battery current. Add the revised 10% efficiency
loss figure, this calculates to a total of 17.6 amps DC. If the battery bank capacity
is rated at 500 Ahrs., actual elapsed time to the suggested 50% state of charge
would net viewing time for the television at approximately 13 hours in ideal con-
ditions.
The run time figure will vary greatly with the actual state of charge of
the battery bank when the discharge process begins. Ambient temperature, com-
bined with other working loads such as lights and parasitic loads applied to batter-
ies, affect run times. Calculating the exact run time is not precise due to all the
variables and equations involved; however, an approximate time
figure can be obtained. Proper battery maintenance and charge cycles affect bat-
tery performance. Observe the battery condition with hydrometer and
voltage readings. Use only distilled water when filling batteries. To achieve the
highest quality of battery performance and longevity keep batteries in their proper
operating range.
Electrical Systems - House
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
S I G N A T U R E
8 • 2 1 8
**Battery connections are made in a Series/Parallel connection.
Domestic batteries are not rated in Cold Cranking Amps (CCA).
Battery Specifications
Ah
(20hr)
240
225
255
CCA
950
**
**
RC
(25A)min
.
450
447
25A - 461
15A - 801
8A - 1627
5A - 3130
Chassis
12 Volt Chassis
31P-MHD (2 each)
6 Volt Domestic
U2200 (4 each)
All Electric
Battery
Specifications
GPL-8D (5 each)
STATE OF VS. OPEN CIRCUIT
CHARGE
VOLTAGE
100%
12.66v
75%
12.45v
50%
12.24v
25%
12.06v
Discharged
11.89v
STATE OF VS SPECIFIC
CHARGE
GRAVITY
100%
1.265
75%
1.225
50%
1.190
25%
1.155
Discharged
1.120
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