[RE-wrenches] 24/7 Water pumping

Tue Mar 15 14:19:45 EDT 2022

Hi William,

A charge controller may not be needed if you are running the pump direct. By designing the PV array so that the Isc is higher than the maximum load demands, and the Voc is less than the maximum operating voltage, you can run PV direct without a controller. Use a high voltage relay (like Gigavac) for switching from the float or pressure switch. 

Charging a high voltage chemical battery direct from PV power is conceivable but much harder. If you can’t find a controller, I would opt to use the pumped water as the battery…pump it high, use gravity. 

Larry Crutcher
Starlight Solar Power Systems

On Mar 15, 2022, at 9:10 AM, William Miller <william at millersolar.com> wrote:

Windy:

Thanks for the info. I have been in contact with Sun Pumps. They can sell me a pump that will work off of a high voltage battery bank (greater than 90 VDC and likely much higher). However they cannot provide or recommend a charge controller to output PV charge at the higher voltage. Do you or any wrench know of a high voltage charge controller on the market?

Thanks in advance.

William 

On Thu, Mar 10, 2022 at 8:29 AM Windy Dankoff <windydankoff at mac.com <mailto:windydankoff at mac.com>> wrote:
Dear William,

SunPumps has a new helical rotor submersible series (positive displacement) that is typically much more efficient for high lift compared to a normal multi-stage centrifugal sub (you'll have to compare the specs).

https://www.sunpumps.com/Products/HR%2010-525%20AC%20DC <https://www.sunpumps.com/Products/HR%2010-525%20AC%20DC>

I have no inside-knowledge of this item, but it's based on good technology similar to Lorentz and Grundfos and SunPumps is on the same level as a world leader.

With any DC pump, you need to be sure it's compatible with battery power if you need 24/7.

I hope you'll let us know how it goes.

Windy

> 
> From: William Miller <william at millersolar.com <mailto:william at millersolar.com>>
> Subject: [RE-wrenches] 24/7 wATER pUMPING
> Date: March 8, 2022 at 7:53:37 AM MST
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org <mailto:re-wrenches at lists.re-wrenches.org>>
> Reply-To: <william at millersolar.com <mailto:william at millersolar.com>>
> 
> 
> Friends:
>  
> I have a client that wishes to pump water at about 10 GPM from spring through autumn equinoxes.   Lift is 300 feet.  (This is the project that will not siphon beyond 33 feet.)
>  
> I can design a solar/battery/inverter system for this purpose but I am wondering if there is a direct DC option.  I am going to look at the Grundfos SQ-Flex tables to see if this is an option.
>  
> Does anyone out there have any advice on best approach to this project?
>  
> Thanks in advance,
>  
> William Miller
>  
> Miller Solar
> 17395 Oak Road, Atascadero, CA 93422
> 805-438-5600
> www.millersolar.com <http://www.millersolar.com/>
> CA Lic. 773985
>  
>  
> 
> 
> 
> From: Jerry Shafer <jerrysgarage01 at gmail.com <mailto:jerrysgarage01 at gmail.com>>
> Subject: Re: [RE-wrenches] 24/7 wATER pUMPING
> Date: March 8, 2022 at 8:58:16 AM MST
> To: William Miller <william at millersolar.com <mailto:william at millersolar.com>>, RE-wrenches <re-wrenches at lists.re-wrenches.org <mailto:re-wrenches at lists.re-wrenches.org>>
> 
> 
> William
> Here is the deal it will be simplest to go AC for the pump because of the requirement of high voltage DC yes there are small er output DC pumps but that is not what you need, first find a AC pump that can do the required 10 GPM at 300 feet of head then design a inverter to fit that bill PV to recharge that usage and then some. look at the first and last day of the desired water demand and go the shorted day as a production base line. When looking at pumps grundfus is very efficient in DC and wild AC but at a cost so look at options output vs input. I have done this with Grundus and DC direct to a 50K storage tank at the very top of the property so it can be done with DC so AC just requires additional nighttime. 
> Here might be an option large enough storage tank to fill every night and a pump big enough to drain it every day, this can be done DC direct, cheaper and less moving parts and the pump can run on a genny if you have bad weather for days, This is how the ones I have done work.
> Jerry

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William Miller
Miller Solar.com
895-438-5600
www.millersolar.com <http://www.millersolar.com/>
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