Backup submersible for 60' well water level at 40' suggestion

[chuckinnc]

I need a backup to my 3/4hp Franklin pump, Would like to go DC as I have 24, 48 & 72v available. Not sure if this is the best way to go, maybe stick with single phase 120v pump? My pump is 240v & my inverters are 120v so I could just drop a 120vac 1/2 hp & use inverter or go with DC, just not sure what pump to get if I go DC, I bought a Chinese 48v sub well pump & worked great for the garden but would not build pressure, I took it apart & found a long screw inside a rubber tube instead of stacks of impellers like you find inside a AC submersible well pump.

 

[jvierstra]

I use this pump (not available anymore; but you can find something similar): https://www.amazon.com/gp/product/B07Q1B82CV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

It's a single phase AC pump (220v x 50hz -- I am in South America) and works great and is dirt cheap. Comes with control box (basically a capacitor soft start). I pump with ~25ft of head from a shallow well 100 yards from house in a buried 1in black roll pipe. It makes >60psi easy. Been using for 3 years now with no problems. I am sure you can find a single phase version in 120V.

 

[chuckinnc]

I use this pump (not available anymore; but you can find something similar): https://www.amazon.com/gp/product/B07Q1B82CV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

It's a single phase AC pump (220v x 50hz -- I am in South America) and works great and is dirt cheap. Comes with control box (basically a capacitor soft start). I pump with ~25ft of head from a shallow well 100 yards from house in a buried 1in black roll pipe. It makes >60psi easy. Been using for 3 years now with no problems. I am sure you can find a single phase version in 120V.

Thanks the 3" version is low power and more than enough lift/pressure for me so this is good information.

 

[OzSolar]

I took it apart & found a long screw inside a rubber tube instead of stacks of impellers like you find inside a AC submersible well pump.

I bet that was a helical rotor, AKA "screw pump". They are capable of as much pressure as you need, just need to make sure you get the right one. Or maybe it was a bad one? Below is the pump curve for a helical rotor pump.

Anytime you're selecting a pump it can be important to carefully chose one based on your application. A pump that does 20 GPM at 20' of lift might only do 5 GPM at 50" and nothing at 100'.

 

[chuckinnc]

I bet that was a helical rotor, AKA "screw pump". They are capable of as much pressure as you need, just need to make sure you get the right one. Or maybe it was a bad one? Below is the pump curve for a helical rotor pump.

Anytime you're selecting a pump it can be important to carefully chose one based on your application. A pump that does 20 GPM at 20' of lift might only do 5 GPM at 50" and nothing at 100'.



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Thanks alot, I will save this thread. I do have a 24 & 48v screw types that work great for my garden & transferring water from 275 gallon totes over 100' of hose and yes it does a great job but thought they were made for volume not pressure. Think I will add a gage & see how hi they will go.