Basement Watchdog Big Dog Backup Sump Pump (2200 GPH @ 10') & 2 Batteries

If you are somewhat familiar with plumbing and working with PVC, primer and cement, you shouldn't have much of a problem. The pdf of the owners manual is available for download on the PRODUCT PAGE to give you a look at the installation process. It can be found on the right side of the page under the "Specs" tab.

Per the instructions for the Basement Watchdog battery backup systems, DO NOT use a maintenance-free or a sealed battery. They are made of different materials and
will trigger a false “Battery problem” alarm.
A new Basement Watchdog 7.5 Hour Standby Battery, model 30HDC140S will run this system for a minimum of 7.5 hours continuously. However, most of the time the pump will turn on and off, and the battery will run the pump intermittently for days. In addition, the unique materials in the battery enable it to last for five to seven years in standby service.

In most cases the backup pump will fit next to the main AC pump in the sump pit. In very narrow pits, the backup pump can be mounted above the main pump. Try to fit the backup pump on the floor of the sump first. The installation instructions are available on the PRODUCT PAGE under the "SPECS" tab for download.

To be completely sure your backup system is fully functional during a power outage or weather event, these systems need to stay plugged in at all times.

You can use any deep cycle marine battery, as long as it is not maintenance-free. However, there are several advantages to using a Basement Watchdog battery. The Watchdog battery accommodates the system’s fluid sensor which will sound an alarm when the battery needs water…a very important feature, since a dry battery will not perform. In addition, Basement Watchdog batteries run longer per charge, and last years longer. A typical marine battery will last 2-4 years, while the Watchdog battery will last approximately 5-7 years. Basement Watchdog batteries are shipped dry (without acid) so they stay fresh on the shelf indefinitely, while wet batteries have a short shelf life.

Update 11/16/15: Basement Watchdog has changed this requirement around 2013 and their backup systems will now accept maintenance free batteries. Please refer to their updated installation manual for instructions on the proper method for this battery installation.