 | Designing battery backup sump pump. |
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Question: I am looking for a little help in designing my own battery backup sump pump. I know that they sell kits that have everything that you need, but the pumps they use must be mounted in the sump hole. My sump hole is small so the backup pump must be mounted on top of the existing pump. This means that the sump must be almost completly full of water before the backup has enough water to start to pump. I don't like this so I would like to create my own system. My basic idea is to use a deep well battery along with a dc style pump. But I want the pump to stay out of the sump and just a pipe going into the sump. This way I can put the pipe down at the same level as my current pump. I'll still need some sort of float to start it and some way to recharge the battery when it gets low. These are the things I don't know how/what to use. Does anyone have suggestions?
Answer: -OK...talking out of my axx here, but couldn't you put a relay in between the battery and the emergency pump such that power would only be applied to the emergency pump when the AC was lost? You can get relays that can be set up to be "always open" when AC is applied to the input. When the AC is lost, the output contacts from the battery will close and power will be available to the emergency pump I'm thinking you could hook up the original float mechanism such that it powered on both pumps at the same time, but only the one with power would actually come on. -Use a pump with sealable connections for hose or pipe at both the inlet and outlet.. The inlet pipe going into the sump would have a foot valve so it doesn't lose prime. Just about any water level switch can control it. You want a charger that will regulate to a trickle charge when the battery reaches full charge. Use a "deep cycle" battery.
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