Installation Manual

Battery Information
975-0639-01-01 Rev D 1–39
This guide for use by qualified personnel only
Table 1-4 Battery Sizing Example
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 Hook-up Configurations” on page 1–41 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.
Battery Bank Sizing Worksheet
The following worksheet is a guide to help you determine your battery needs. Be
generous in estimating the time for which you will run each of the loads to ensure
sufficient battery capacity.
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 20 for 24 volt system) 243 Ah
Recommended Battery Bank Size in Ah (multiply by 2) 486 Ah
ConextSW-NA-InstallationGuide.book Page 39 Tuesday, July 21, 2015 4:39 PM