Product Manual A

AIR 40, AIR Breeze, AIR 30, AIR MaX, AIR X MARINE and AIR SILENT-X are trademarks of Primus Wind Power 2013 Primus Wind Power Inc. AIR Owner’s Manual 3-CMLT-2020 REV-A / 2-26-2021 9
SIMPLE TIPS FOR DEEP CYCLE BATTERY BANK SIZINING
In preparaon for baery sizing, know:
ELECTRICAL USAGE - the amount of energy consumed 1 day in Wa-
hours (Wh)
DAYS OF AUTONOMY - days of baery back-up required if unable to
charge the baeries by any means.
DEPTH OF DISCHARGE - limit of energy withdrawal to which you will
subject the deep cycle baery bank.
• Deeper discharge = Shortened baery life.
• Recommended: never discharge a deep cycle baery below 50% of
its capacity
• O-grid applicaons, a 25% DoD will extend baery life signicantly
TEMPERATURE - Standard for most baery rang is 25 ° C /(77 °F).
• Cold temperatures = reduced baery capacity
• High temperatures = shortened baery life
RECOMMENDATION - Keep the number of parallel strings of baeries to
three or fewer (one is preferred and considered best pracce). More than
three strings of baeries, risks shortening baery life due to uneven
charging.
Baeries in Series = Voltage is Addive
Baeries in Parallel = Ah is Addive
*Example: 2 12V 100Ah Baery Bank
Series 24V 100 Ah
Parallel 12V 200 Ah
• A system load of 6,000 Wa-hours per day
• 3 Days of Autonomy (back-up) needed
• Planned Depth of Discharge (DoD): 40%
• Baery bank ambient average low 15.6 °C (60 ° F)
CALCULATIONS: calculate baery bank size, use example below:
STEPS:
EXAMPLE:
3 days of Autonomy:
6,000 x 3 = 18,000 Wh