Fw: Need a Deep Well Pump Solution [RE-wrenches]

[Ray Walters]

Hi Guys;

The Solamotor is actually hard to meter because the amp draw varies with
each stroke. At a lift of 335 to 350 ft and a flow rate of around 1/2 gpm,
I've measured amp draw varying consistently from 6 amps to about 9 amps.
This is at an also varying voltage of 24 to 25 volts. High amps low volts
and vice versa. I'd say watts are between 175 and 200 watts. I've been
trying to get one of Brand electronics' new DC watt meters to get a better
handle on the power draw. 
For battery systems, I like breaking down water pumping to watthr/gal. too
Allan. I'd say the actual # for the Solamotor is closer to 6 w-hr/gal..
Like I said in my original post its not as efficient as the Sunrise. The
other pumps (Grundfos SQ Flex & Dankoff ETA) are sounding good, but I've
never tried them. However, I had all kinds of trouble with Grundfos Solar
pumps before. (the SA1500 model) Out of 10 installed, we had problems with
8 of them, resulting in years of constant callbacks. I also serviced
several Mono hand pumps, which used the same pumping mechanism as the ETA.
The pump itself was reliable, but the shaft drive system was problematic.
 As much trouble as I've seen with Solar water pumping, I still love it.
Here's why: 
1.Its still experimental with no one concept or brand being the clear
winner and 
2. Water is second only to air in importance to human survival. If we as
wrenches can work the bugs out of solar water pumping, the whole world will
benefit.
  
Ray


>>Windy,
>>can you give me an estimate of the number of BP85s that I would have to
>>rewire/divert to run the pump? Would it be four? And expected gpm?
>>I'd like to try to compare pump efficiencies. The Solamotor man estimated
>>10A at 24VDC to run the jack pump at 1/2 gpm. That's a surprisingly high 8
>>watthr/gallon figure.
>>
>>Thanks,
>>Allan
>
>
>Allan,
>
>This is for a 350 foot lift. You are proposing to divert a rated 340 
>watts of PV.
>
>I'm looking at our ETAPUMP Integrated Systems Sizing Table. We offer 
>a 300 watt and a 480 watt system. I'll simplify the matter by looking 
>at the 300 watt system.
>
>System # ETA-04H-300, at 350' lift, will pump 2.5 GPM.  (with 480 
>watts, it speeds up to 3.4 GPM, so with your proposed array of 340 W, 
>you will get nearly 3 GPM.
>
>The 300W system has an ultimate capacity of 525' Whis is good to know 
>in case the well drops further. Submersion depth is not limited and 
>is insignificant.
>
>
>
>Now, let's compare to the Solamotor jack system. I ASSUME he means 
>you need 10A rated array at nominal 24V PV-direct. That about 10A X 
>34V = 340 watts array rating. That is surprising, in relation to a 
>yield of 1/2 GPM. There might be a miscommunication somewhere.
>
>Nevertheless, Solamotor is exotic compared to a submersible, and you 
>can't use a pitless adapter so it would require a well pit (in 
>well-drained soil) to prevent freezing, which is a substantial added 
>cost.
>
>
>
>Next, let's think about efficiency compared to an AC pump running 
>from the battery system. We do have the same ETAPUMP available for 
>battery systems. Here is performance for the same helical rotor pump 
>end and motor, operating from a 48V battery system. (We don't yet 
>have a full-power 24V model, but for this comparison, we need only 
>consider watts).
>
>ETA-HR04H-48V at 350 feet will pump 2.7 GPM drawing 323 watts from 
>the battery system.
>
>How does that compare with the AC pumps you have considered?
>
>Windy
>
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