Installation Manual

Battery Information
975-0639-01-01 Rev D 1–37
This guide for use by qualified personnel only
Battery Information
Battery Bank Sizing
Battery capacity Battery size or capacity is just as important as the battery type
selected for use with the Conext SW. 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 to have a minimum battery size of 100 amp-hours (Ah) for moderate
loads (<1000W) and greater than 200 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 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 battery rated for 100 Ah can deliver 5 amps for 20 hours (5 amps × 20 hours = 100
Ah). Depending on the battery chemistry, this battery can deliver a higher or lower
current for less or more time.
ConextSW-NA-InstallationGuide.book Page 37 Tuesday, July 21, 2015 4:39 PM