SUNCO ELECTRONICS
Battery Bank Sizing
Home Contact Us Ordering Products
 |
How To Increase System Power
Two or more batteries can be easily connected to boost your system's voltage and/or capacity. There are three methods to obtain additional voltage and or capacity, as described below:
To increase voltage, connect batteries in series.
Battery System: 12 Volt, 225 AH
Using Two Deep Cycle Batteries
( 6 Volts, 225 AH)
To increase amp-hour capacity, connect batteries in parallel.
Battery System: 6 Volt, 450 AH
Using Two Deep Cycle Batteries
(6 Volt, 225 AH)
To increase both voltage and amp-hour
capacity, connect batteries in series/parallel.
Battery System:12 Volt, 450 AH
Using Four Deep Cycle Batteries
( 6 Volt, 225 AH)
Battery Bank Sizing Calculations
Example 1:
Constant Power Load
Nominal 24 Volt (12 Cell) System
Load:1150 Watts
Backup Time:4 Hours
Minimum String Voltage: 21 Volts
Minimum Cell Voltage: 21 ÷ 12 = 1.75 volts per cell
Four hour discharge rate per cell to 1.75 VPS (from table): 32.8 watts
Four hour discharge rate per string:32.8 x 12 = 394 watts
Number of strings required: 1150 ÷ 394 = 2.92
Results:3 strings required to meet the load.
Constant Power (Watts Per Cell) /Time (Hours)
| End VPC | 1.0 Hr | 1.5 Hr | 2.0 Hr | 2.5 Hr | 3.0 Hr | 4.0 Hr | 5.0 Hr | 6.0 Hr | 7.0 Hr | 8.0 Hr | 9.0 Hr | 10.0 Hr |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1.63 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 32.6 | 35.9 | 39.1 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.65 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 32.6 | 35.9 | 39.1 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.67 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 32.6 | 35.9 | 39.1 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.69 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 32.6 | 35.9 | 39.1 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.71 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 32.6 | 35.9 | 39.2 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.73 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 32.7 | 36.0 | 39.3 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.75 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 32.8 | 36.1 | 39.9 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.80 | 125 | 92.0 | 72.9 | 61.3 | 52.8 | 33.3 | 36.7 | 40.0 | 27.1 | 24.3 | 22.1 | 20.3 |
| 1.85 | 120 | 90.3 | 72.4 | 60.5 | 52.0 | 34.3 | 37.7 | 41.1 | 26.6 | 23.9 | 21.7 | 20.3 |