![]() ![]() They also have a start-up requirement that is usually 2-3 times the running watts that will last for a second or so. Sump pumps typically have between 600 and 1,000 running watts with 1/3 horsepower pumps on the lower end and 1/2 horsepower pumps on the high end. If you size your inverter too small, it doesn’t matter how large your battery is. ![]() Having a properly sized inverter is critical to operating your sump pump with a deep-cycle battery. Inverter and Sump Pump Energy Requirements I figure this may be of interest if you’re not too interested in doing quarterly battery maintenance. I’m only using lead-acid batteries in my examples, but the AGM’s are maintenance-free as opposed to the flooded types. I also took a look at what two 215AH GC2 6-volt golf cart batteries could do when hooked up in series.Īll of the AH ratings are at the 20 hour rating. I took a look at some common sizes and types, and made my examples using a 100 amp-hour (AH) AGM, an 80AH AGM, a 105AH Flooded an a 90AH Flooded battery. If you’re just looking for a quick chart of the results to get an idea, feel free to click here.Ĭombined with a properly sized inverter and cables, a 12-volt deep-cycle battery should be able to power your sump pump for a little while. There were 3 considerations to be made when I came up with my numbers regarding the batteries, the inverter, and Peukert’s Law. In the below examples, I looked at 5 different deep-cycle battery set-ups and with so many makes and models of pumps I used a range of sump pumps from 600 to 1,000 watts and in increments of 50. If the pump is only turning on a couple of times per hour you can easily get 1 or more days of use out of the battery. ![]() If you’ve got a deep cycle battery on hand, or if you were looking to plan ahead, you’re probably wondering just how far that brick of lead and acid can take you.Ī deep-cycle battery can run a sump pump motor continuously for 45-80 minutes depending on the size of the pump. There’s probably nothing more nerve-wracking during a power outage than to watch your sump overflow and flood your basement. ![]()
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