Deep Cycle Battery or Standard Battery ?
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    Deep Cycle Battery or Standard Battery ?

    In a upper class suburb with under ground utilities with a sump pump.
    The power rarely goes out but we have a 120v main pump and a 12v back up pump.
    I just noticed that the back up battery is toast. No surprise cause the date on it is 1/09.
    Is it really worth the extra for a deep cycle battery?

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    I would go deep cycle myself. However standard automobile batteries will carry a much longer warranty period.
    switchbow likes this.

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    Quote Originally Posted by jonrjen View Post
    I would go deep cycle myself. However standard automobile batteries will carry a much longer warranty period.
    I second that!
    jonrjen likes this.
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    Deep cycle batteries are designed to be run down low and then recharged. Car batteries are used and run down a little and then are recharged all the time the car is running, until it is fully charged. If your pump is running and then shuts off and is recharged fully then a deep cycle will be best. If your pump is kept at full charge all the time and only used for a short period and is kept on a charger, like a car is kept charged by the alternator, use a car battery, heavy duty for cars with a big engine. Commercial batteries warranties are shorter as are deep cycle batteries. I would call someone who installs farm pumps or basement sump pumps and ask their opinion.

    If this is only used as a backup power source, and is kept at the full charge by an outside electrical source then a car battery will be best, (IMHO) because it is being treated like a car battery. A deep cycle is build extra heavy so it can hold a charge longer, be drained almost devoid of any charge over a longer period of time, like with an electric trolling motor,then fully recharged. That is why it is called a deep cycle. I remember asking why 2 different batteries, when I used a guy's boat in MN. He said one was to start the boat motor (car battery) and the other was for the trolling motor, (deep cycle).
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    The main pump runs for about 90 seconds every hour or so during the rainy march.
    I can't remember the last time the power was out. (last summer?)
    The back up pump (battery) is set to a higher water level. So it might kick in a couple times per year when the power goes out.
    I'm guessing that either battery has a shelf life of about 5 years.

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    What type battery does it have now? And what size?
    How often does the sump pump come on? How long does it run?
    How often do you lose power? How long does it stay off?
    Deep cycle batteries and automotive batteries have different types of posts so that is another consideration.
    One more thing, stay away from any battery that has 2 different types of posts on them. They have the worst characteristics of both types of batteries.

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    Stay with the car battery. Like hombre243 said, if does not fully or near fully discharge then recharge, it will develop a memory and not hold it's charge over time.
    kschilk likes this.
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    you might also look at an SLA (Sealed Lead Acid) battery.
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    Get a car battery and put a Battery Tender on it.

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    put a Battery Tender on it.
    We have a special controller box it sits in. All in one thingy.
    This controller receives the wires from the float switch and power from a wall cube.
    It monitors and charges the battery while switching on the pump when needed.

 

 
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