With a given sump pump the only option is to increase battery capacity. This can be done in one of 2 methods:
- Install a larger battery. Lead acid batteries range in size from group size 24 to 8D. The Manufacturer’s recommendation is to use a single battery of minimum size 27. Capacity can be increased by going to a higher numbered group size battery. For group size numbers exceeding 31, batteries are very heavy – too heavy the average person to safely manually move.
- Use multiple batteries and install them in parallel as shown in Figure #1.
For battery banks of capacity greater than a single Group#31 battery, method 2 as illustrated in Figure 1, is the preference of most users. In order to maintain balanced battery charging by stressing all batteries in the bank equally, it is important that the batteries be new, identical, and installed at the same time in the connection configuration shown in Figure #2. It is also important that all wire members of the array be of #2 gauge.