help choosing well pump setup

[outboard1196]

I'm looking to add a well pump for my off grid property , I currently have a solar setup 24v 200ah with 400w of panels with room to grow .
the well is 100' deep panels are 100' from well batteries are 50' from well. orignally i was looking at a 24v pump using this pump here but concerned about long run of cables and voltage drop . I started looking at brushless well pumps , I see some on ebay with controllers for around $300 but do I want to gamble with the quality ?
I have been looking at rpssolar for a while, the cost is high [er] but seems they stand behind the product ? I would be pumping to pressure tanks and mostly during the day but would also like to pump at night. when looking at brushless systems they prefer running direct off panels but battery is an option , but kind of vague as to how its done, hook battery direct to pv input ? I'd prefer to have brushless system hooked to my batter bank rather then panels , does this make sense? any input would be helpful , thanks.

 

[x98myers7]

grundfos is the standard for DC/solar/off-grid well pumps. expensive, but worth it.

 

[outboard1196]

grundfos is the standard for DC/solar/off-grid well pumps. expensive, but worth it.

An sq maybe , didn't want to use an inverter .

 

[x98myers7]

grundfos are DC rated, most are 30-300v. so, unfortunately, with a 24v system, you're not going to be able to support DC direct on that. you'll need a DC-DC converter to step that up which, to get enough amperage to support a 3/4hp pump or larger, will cost more than an AC inverter. don't forget to account for the surge startup requirements for well pumps, which can be 100-150% of working load.

options are....

• change to a 48v system
• expensive dc-dc converter
• go AC
• roll the dice on a subpar quality pump

 

[Madcodger]

I met yesterday with my well driller about a new house we're building.Very experienced, well-regarded guy in our area. When I told him we were going solar, probably remaining off-grid, he said, "Grundfos SQ" without even a moment's hesitation. Told me that they were seeing a starting current of about 5 amps on the 240V pumps typical of our area (often 200-300 foot depth, I've noticed in talking with others) compared to about 17 amps from others they commonly install, for grid-tie only. That was enough for me! Grundfos SQ it is.

And no, we didn't discuss 120V, etc. 240V will be needed for several other things in the house, so makes sense to have a 240V well pump.

 

[outboard1196]

I met yesterday with my well driller about a new house we're building.Very experienced, well-regarded guy in our area. When I told him we were going solar, probably remaining off-grid, he said, "Grundfos SQ" without even a moment's hesitation. Told me that they were seeing a starting current of about 5 amps on the 240V pumps typical of our area (often 200-300 foot depth, I've noticed in talking with others) compared to about 17 amps from others they commonly install, for grid-tie only. That was enough for me! Grundfos SQ it is.

And no, we didn't discuss 120V, etc. 240V will be needed for several other things in the house, so makes sense to have a 240V well pump.

Yeah I've decided to go with an sq pump (115v) and inverter . gives me option to run from generator if I need it . same price as an rps pump .

 

[hogback]

I have a Franklin fhoton helical rotor setup and it's been flawless. Takes cd from panels to the controller box. I also bought the 120/240 box to allow ac power, and I've just been using that with an extension cord. I have the solar panels, just haven't mounted them yet. Soft start, water is about 100 deep, plus another 100' to storage tanks. Uses 1kW for 5gpm.

 

[outboard1196]

I have a Franklin fhoton helical rotor setup and it's been flawless. Takes cd from panels to the controller box. I also bought the 120/240 box to allow ac power, and I've just been using that with an extension cord. I have the solar panels, just haven't mounted them yet. Soft start, water is about 100 deep, plus another 100' to storage tanks. Uses 1kW for 5gpm.

Interesting , lots of information from franklin but I dont see anywhere to buy besides dealer. Requires a high DC input , would you share the cost of your system ?

 

[hogback]

Interesting , lots of information from franklin but I dont see anywhere to buy besides dealer. Requires a high DC input , would you share the cost of your system ?

I can't remember honestly. 2-3k guessing?

 

[Schweg2]

Yeah I've decided to go with an sq pump (115v) and inverter . gives me option to run from generator if I need it . same price as an rps pump .

Same here...pulls roughly 8-9 amps

 

[OM617YOTA]

I've got a Grundfos myself. Runs just fine and barely makes my 2x LV2424s grunt when the pump starts.

 

[Rednecktek]

I keep looking at Grundfos but I'm not a pumpologist engineer and can't make sense of the sizing stuff. 300ft deep, 4gpm min, 70psi min.

 

[outboard1196]

I keep looking at Grundfos but I'm not a pumpologist engineer and can't make sense of the sizing stuff. 300ft deep, 4gpm min, 70psi min.

Are those your specs for your system needing a pump ?

 

[Rednecktek]

Are those your specs for your system needing a pump ?

Yeah, that's what I'm looking for when my well comes due to be redone.

 

[outboard1196]

Yeah, that's what I'm looking for when my well comes due to be redone.

https://api.grundfos.com/literature/Grundfosliterature-6512252.pdf

Here's the pdf with pump curves listed .

 

[outboard1196]

Well I got the pump going a few days ago , was a long processes had to extend the casing above ground .
Feels good to pump water off grid finally !

 

[jolondon]

Yeah I've decided to go with an sq pump (115v) and inverter . gives me option to run from generator if I need it . same price as an rps pump .

How did this work out for you and who did you buy the pump from?

 

[outboard1196]

How did this work out for you and who did you buy the pump from?

Its been working awesome .
I got it from aquascience.net

 

[OzSolar]

grundfos are DC rated, most are 30-300v.

It should be noted that the most common Grundfos pump, the SQ is AC only. Still a fantastic pump for off grid living.

The SQ Flex is the "magic" one that can take 30-300V DC and work on AC power.

 

[NordicNerd]

Is your water depth 100ft? for shallow wells you can use the Burcam 120 volt - only good for 25ft of lift though. It's a Canadian company so they are not well know outside the country. The pumps are generally soft start with a max 15 amp draw (surge) and 7 amp running.

https://www.princessauto.com/en/3-4-hp-tankless-stainless-steel-shallow-well-jet-pump/product/PA0008748139?msclkid=fc3debdc85b01b625b038d0437d6307a&utm_source=bing&utm_medium=cpc&utm_campaign=Shopping%20Campaign%20%231&utm_term=4585100934900538&utm_content=Shopping%20July%202023

http://burcam.com/en/products/water_in_pumps_and_systems/jet_pumps

they also make some good deep well pumps here:

Burcam - WATER-IN PUMPS AND SYSTEMS - S.S.SUBM PUMP 13 STAGES 5GPM 1/2HP 115V 3WIRE+G

BURCAM official site. Moving water at an affordable price, BURCAM is a leading innovator in water-in and water-out residential and light commercial pumping equipment since 1978.

burcam.com