Franklin AC 1 hp

ws9876

This 230v  AC pump at 110 ft probably uses quite a surge to get going. I dont know what the winding design is on AC pump motors but..

I was wondering if a guys needs were low 20-40 ga a day...

and there was a situation where grid power was not available for a long time....could you send DC  48v power to it with a minimal surge of DC and expect it to pump at least at a very low volume for say 5 min. at a time in order to fill a small tank which could have its own small AC pump to run off an inverter....????? I mean what would make it not work??? 

or could you mod the AC motor so it would at least function in a small way for 5-10 minutes(then 10 min. cooling) at a time without it self destructing..??

Dave Angelini

Nope !  For a better answer humor us and list a model number.

BB.

Probably looking at 2.4 to 4 kWatt AC inverter to run a "generic" 1 HP pump. If it is a three wire pump (starting capacitor at well head, not in pump body--Those do start easier/less surge current).

Just for sake of argument, here is a 24 VDC submersible well pump (4" inch, there is also a 6" version too):

https://www.solar-electric.com/aquatec-swp-4000-submersible-diaphragm-pump.html

https://www.solar-electric.com/lib/wind-sun/Aquatec_Solar_Water_Pumping_Series_Brochure.pdf

https://www.solar-electric.com/lib/wind-sun/Aquatec_SWP_4000_%26_6000_Manual.PDF

Roughly 1 GPM at ~200 foot head (~5 GPM at 20 foot head). Draws 3.3 amps at 200 Foot head @ 24 volts.

Could be used to fill a cistern, or even pressurize a tank--If you wish and avoid the second pump (really depends on volume per day, well depth, pressure needed, how much water per "batch"--Washing, shower, etc.).

Designed to run from either a solar array (Vmp~30 to 36 VDC nominal). Or a 12-24 volt battery bank.

Depends on amount of sun, can you store water for a few days, want battery power, or if you are going to use a 48 VDC battery bank at your home and ship power to the pump...

3.3 amps * 24 volts = 79 Watts of power

Run a 200-300 Watt 60 or 72 cell panel, and you are done... Or you could look at other options.

Say running 48 volts nominal (really 41 to 65 VDC) from your battery bank to the pump, then using a DC to DC converter at the well head:

Just a random 65 to xx volt buck (down) converter:

https://www.amazon.com/Converter-DROK-Regulator-Constant-Adjustable/dp/B01MSJQAKY

Very roughly, the 48 volt wiring would run from 3.3 amps to:

• 3.3 amps * 24 volts operational * 1/41.0 low battery = 1.9 amps in DC bus wiring to well

Using simple voltage drop calculator. Assume 41 volts in, 1.9 amps, 2 volts allowable drop, 10 AWG cable--How far of DC wire run:

https://www.calculator.net/voltage-drop-calculator.html?material=copper&wiresize=3.277&voltage=41&phase=dc&noofconductor=1&distance=500&distanceunit=feet&amperes=1.9&x=0&y=0

500 feet over 10 AWG cable and 1.9 amps gives:

Voltage drop: 1.90
Voltage drop percentage: 4.63%
Voltage at the end: 39.1

That ain't bad...

Some food for thought--And what options are possible. Some unknowns--I do not know the surge current for starting the pump. High surge current may change the down converter / wiring needs.

Also other issues like lightning (if a local possibility) and all of the other well/pump parameters.

The links are to our host's web-store... I am sure they can give you much better/more complete information than I.

If the equipment is "so cheap"--Getting an extra dc to dc converter for spares--Why not.

-Bill

mike95490

Here's my franklin motor power listing.  Don't forget the power factor multiplier that your inverter has to power !!