Estimating Battery Requirements
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Figure 19 Battery Sizing Example
Appliance
(A) Power
Consumption
(Watts)
(B) Operating
Time per Day
(Hours)
Daily watt-hours
needed for this
appliance
(= A × B)
TV & VCR
200 W
2 hours
400 Wh
Small
microwave
oven
800 W
15 min = 1/4 hour
200 Wh
3 lamps, 60
W each
180 W
4 hours
720 Wh
Coffee
maker
600 W
15 min = 1/4 hour
150 Wh
Hair dryer
1500 W
6 min = 1/10 hour
150 Wh
Total daily watt-hours of AC load
1620 Wh
× Number of days between charges
3
= Total watt-hours of AC load between charges
4860 Wh
Battery Ah used between charges (divide by 10)
486 Ah
Recommended Battery Bank Size in Ah (multiply by
2)
972 Ah
This example illustrates how quickly your battery needs can
escalate. To reduce the required battery bank size, you can either
conserve energy by eliminating or reducing the use of some loads,
or recharge more frequently.
Battery Banks
As your power requirements increase, you may need to use more
than one battery to obtain sufficient capacity. Batteries can be
connected in parallel, in series, or in series-parallel to create
higher capacity systems.
See
Battery Cabling and Connections on page 70
for more
information about battery inter-connection schemes.
Mixing Batteries
Batteries connected in parallel should be of the same type and
amp-hour rating and from the same manufacturer.
It is not recommended to connect batteries of different types,
amp-hour ratings or manufacturers. Improper charging and
decreased battery life will result.
DANGER
EXPLOSION HAZARD
Do not mix different battery types within the same battery bank.
Failure to follow these instructions will result in death or serious
injury.
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