Section 7: Batteries
Series – Parallel Connection
As the name implies, both the series and parallel techniques are used in combination. The result is an increase in both the voltage and the capacity of the total battery bank. This is done very often to make a larger, higher voltage battery bank out of several smaller, lower voltage batteries. This is common with all battery-inverter system voltages. The smaller, lower voltage batteries are first connected in series to obtain the needed voltage, and then these “batteries, connected in series” sets are connected in parallel to increase the battery bank capacity.
The best arrangement when using a series-parallel configuration is to connect all the smaller, lower voltage batteries in parallel, then connect all these “batteries in parallel” into series sets to obtain the needed voltage. This configuration is often called “cross-tying.” This is less convenient and requires additional cables but reduces imbalances in the battery, can improve the overall performance.
Cross-tying (shown as dashed -------- lines in the illustration below) helps equalize the voltage in the batteries. If cross-tying is not desired, the dash lines can be ignored.
6V | 6V |
100 Ah | 100 Ah |
6V | 6V |
100 Ah | 100 Ah |
FUSED
DISCONNECT
12V INVERTER12V
(Total Battery Capacity= 200 Amp Hours)6V | 6V | 6V | 6V |
100 Ah | 100 Ah | 100 Ah | 100 Ah |
6V | 6V | 6V | 6V |
100 Ah | 100 Ah | 100 Ah | 100 Ah |
FUSED
DISCONNECT
24V
(Total Battery Capacity
= 200 Amp Hours)
Prosine 2.5/3.0 Installation & Operation Guide | 77 |