Battery Bank Sizing
Battery Information
Battery capacity Battery size or capacity is just as important as the battery
type selected for use with the Ultra UL1741. The batteries are the most
important part of your system, so it is recommended that you purchase as
much battery capacity as possible. A large battery will extend running time
and ensure that your inverter/ charger delivers full rated surge.
It is recommended a minimum battery size of 200 amp-hours (Ah) for
moderate loads (<1000W) and greater than 400 Ah for heavy loads.
See "Estimating Battery Requirements" for information on a more detailed
calculation.
About Amp-hours A number of different standards are used to rate
battery energy storage capacity. Automotive and marine starting batteries
are normally rated in cranking amps. This is not a relevant rating for
continuous loads like an inverter. Deep-cycle batteries use a more suitable
rating system such as amp-hours (Ah).
Amp-hour capacity is the number of amps a battery can continuously
deliver during a specified number of hours. It is represented by the product
of the two —amps multiplied by hours.
A typical marine or RV battery rated for 100 Ah can deliver 5 amps for
20 hours (5 amps × 20 hours = 100 Ah). This same battery can deliver a
higher or lower current for less or more time, limited approximately by
the 100 Ah figure (50 amps for 2 hours or 200 amps for 1/2 hour), but
usually the capacity figure given is only accurate for the specified
duration (20 hours).
For Ultra UL1741 inverter systems requiring a 24-volt battery bank,
• A pair of 200 Ah@12 volts batteries may be connected in series to
create a 24-volt bank of 200 Ah@24 volts capacity,
• While two of these series pair branches may be connected in parallel
to create a higher capacity 400 Ah@24 volts battery bank.
Summary of Contents for FULAGDA1512A
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