[RE-wrenches] 24/7 Water pumping

Tue Mar 15 18:26:41 EDT 2022

The Midnite Classic can go higher to 72v stock, and they have models 
that can work with 120 vdc batteries.

Ray

On 3/15/2022 12:19 PM, larrycrutcher wrote:
> 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> 
> 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
>
>     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>
>>     *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>
>>     *Reply-To:*<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>
>>     *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>, RE-wrenches
>>     <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 <http://Solar.com>
> 895-438-5600
> www.millersolar.com <http://www.millersolar.com/>
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