Samlex America PST-200S-24E - Manual (Page 23)

22 | SAMLEX AMERICA INC. SAMLEX AMERICA INC. | 23
seCtIOn 7 | General Information on Batteries for
Powering Inverters
based on the actual application requirements.
Please consider using the following Programmable Low Battery Cut-off / “Battery
Guard” Models manufactured by Samlex America, Inc. www.samlexamerica.com
- BG-40 (40A) – for up to 400W, 12V inverter or 800W , 24V inverter
- BG-60 (60A) - for up to 600W, 12V inverter or 1200W , 24V inverter
- BG-200 (200A) - for up to 2000W, 12V inverter or 4000W , 24V inverter
Depth of Discharge of Battery and Battery Life
The more deeply a battery is discharged on each cycle, the shorter the battery life. Using
more batteries than the minimum required will result in longer life for the battery bank.
A typical cycle life chart is given in the Table 7.5 below:
tABLe 7.5: tYPicAL cYcLe LiFe cHARt
Depth of Discharge
% of Ah capacity
cycle Life of Group
27 /31
cycle Life of Group
8D
cycle Life of Group
Gc2
10 1000 1500 3800
50 320 480 1100
80 200 300 675
100 150 225 550
note: It is recommended that the depth of discharge should be limited to 50%.
Series and Parallel connection of Batteries
Series connection
Fig 7.2: Series Connection
When two or more batteries are connected in series, their voltages add up but their
Ah capacity remains the same. fig. 7.2 above shows 4 pieces of 6V, 200 Ah batteries
connected in series to form a battery bank of 24V with a capacity of 200 Ah. The Posi-
tive terminal of Battery 4 becomes the Positive terminal of the 24V bank. The Negative
6V 6V
Battery 4 Battery 3
6V
Battery 2
6V
Battery 1
24V Inverter
or 24V Charger
Cable “A”
Cable “B”