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52 Freedom SW 230V Installation Guide
Battery Information
Battery Bank Sizing
Battery capacity Battery size or capacity is just as important as
the battery type selected for use with the Freedom SW 230V. 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 (< 1000 watts) 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 single marine or RV battery rated for 100 Ah can deliver
5 amps @12 volts for 20 hours (5 amps × 20 hours = 100 Ah
@12 volts). 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 a half hour), but usually the
capacity figure given is only accurate for the specified duration
(20 hours).
For Freedom SW 230V 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.
Freedom SW 3K2K 230V InvChg Install Guide.book Page 52 Friday, June 20, 2014 9:11 AM