H-S81-HS Installation & Operation Manual — P/N LS10114-000HI-E:A 2/24/2015 173
Calculation of Battery Capacity Power Supply Set Dimensions
Use the following table to calculate the capacity of the batteries to be used.
• Calculate battery capacity in standby A9[Ah]=(A8) x 24 [Hours].
• Calculate battery capacity in alarm condition B9[Ah]=(B8) x 0.083 [Hours].
• Calculate battery maximum capacity [Ah]=A9+B9
• Multiply the total capacity by a safety factor of 1.2. The result of the multiplication will be the
minimum required battery capacity.
• Select a battery type with capacity equal or higher that the calculated one, referring to the table
at the bottom of the page
The table below shows the lead battery type to be used according to the calculated capacity
Total System Standby Current= (A8) A
x Standby Time 24 Hours
Standby Battery Capacity= (A9) Ah
Total Alarm Current= (B8) A
x Alarm Time 0.083 Hours
Alarm Battery Capacity= (B9) Ah
Total Calculated Battery Capacity= A9+B9 Ah
x Derating Factor= 1.2
Battery Size Needed= C Ah
Part Number Description
6FM40-X 12 V - 40 Ah batteries
6FM65-X 12 V - 65 Ah batteries
6FM120-X 12 V - 120 Ah batteries