How to Build a Battery Backup for a Sump Pump
Sump pumps are used to remove unwanted water from basements and crawlspaces. When these pumps fail, or when there is a power failure, the water is no longer removed and the result can be disastrous. A backup pump is needed, but it must also be able to run off of battery supply rather than a 110 volt line in the event of a power outage. Does this Spark an idea?
Things You'll Need
- Tee check
- Adapter elbow
- Hack saw
- Tape measure
- PVC pipe cleaner
- PVC pipe cement
- Screwdriver
Instructions
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1
Select the appropriate backup pump for your situation. These pumps are available in a wide variety of sizes and include a number of options. Some of the more useful options are an alarm to alert you when the backup is activated or when the power supply is drained. Most of these pumps come as complete kits with all fittings and wiring ready to install.
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Mount the backup pump on the bracket using the hardware included. The bracket should rest on the side of the sump pit with the pump lowered into the pit and positioned just above the main pump. The other end of the bracket will be flush on the floor of the basement. Place the marine battery on this section of the bracket to hold it in place. The weight of the battery will easily offset the weight of the pump, thus securing the bracket and pump.
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3
Cut into the main drainage line from the sump pump approximately two feet above your check valve. Smooth off the cut surfaces and clean them with the PVC cleaner. Apply pipe cement to both ends and insert the Tee check valve. This valve will prevent any water from being forced back toward the backup pump when the primary pump is working. Attach the hose from the backup pump to the Tee check valve and secure all fittings.
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4
Attach the power cables to the marine battery terminals. You may now also attach the battery charger to the marine battery and plug in the adapter to a 110 volt outlet. Test the backup pump to be certain all functions are working properly.
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Tips & Warnings
Depending on the size pump you need, these systems start at around $250. Not a large investment to prevent a major flooding event.
When purchasing a backup system, be aware that most do not include the marine battery, but most will include the battery case. Be certain to check what comes with the unit you are selecting.
