We let the pump run continuously until it stopped pumping water. The flow rate of the backup pump was about 14 gallons per minute with a fully charged battery. The water flow was adjusted to match the flow rate of the pump. For each test, the batteries were fully charged, power was removed from the primary pump and the charger was turned off. To answer this question we tested three 12-volt sealed lead-acid batteries rated at 40, 75 and 84 ampere-hours. This is the worst-case scenario and it means a lot of water is entering the tile system. For continuous operation: How many hours of protection will a battery with a certain AH rating provide if the pump runs continuously? The duration of continuous pumping by a backup sump pump based on the rated AH of the battery.
#Hook pump to car battery connector manual
When purchasing a battery, check the backup pump manual to find out if the manufacturer recommends a maximum AH battery rating for the pump.įigure 9. The battery and some plumbing pieces are sold separately. However, they are specialty batteries and often cost much more than the Wet Cell plus, they may require a special charger.īackup sump pumps often are sold as complete units and contain most of the necessary parts, including a charger. These are important considerations because the battery will be located in the basement, which often has higher humidity than outside air.
The Gel Cell and AGM are preferred for backup sump pumps because the plates do not sulfate easily, the terminals don’t corrode and the chance of a hydrogen gas explosion occurring is small. Some versions of the lead-acid battery that you may find in stores are the Wet Cell, Gel Cell and Absorbed Glass Mat (AGM).
However, for backup sump pumps, this type is not as preferable as a deep-cycle battery. The AH rating usually is printed on the top of the battery.Ĭombination 12-volt lead-acid batteries have a CCA and an AH rating. For example, if a battery has a rating of 80 AH, it would provide 4 amps an hour (80/20) for 20 hours. The standard AH rating indicates the number of amps provided in excess of 20 hours. This type of battery is rated in ampere-hours (AH). This is not the type of battery to use with a backup sump pump except in an emergency.Ī deep-cycle lead-acid battery (sometimes called a marine battery) is recommended for backup sump pumps. The number of CCAs often is printed on top of the battery case. The output and capacity of these batteries are rated in cold cranking amps (CCA). These batteries are designed to provide a large amount of current for a short period of time. Most people are familiar with the standard lead-acid vehicle battery used in a car. Two types of lead acid batteries are available.
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