Deep Well (400'-600' TDH) Water Pumping [RE-wrenches]

[Travis Creswell, Ozark Solar]

I am designing a pumping system for a well that has yet to be drilled.   The
well driller is saying that in this area he won't hit drinkable water until
~400' and if that's sulphur he will need to go another 200'.  So we might be
looking at TDH of 600'.  I believe him.

The well will be for a weekend cabin that already has a small 12 volt DC
only system.  The customer is determined to have AC soon.  I need some help
choosing the least expensive way to go for water pumping.  Historically and
quite successfully I've used dual inverter set ups feeding a standard 240v
well pump.  I have a dual DR3624 set up on a 500' well that works
wonderfully and I'm thinking that's the best way to go with this customer.
I have done some calculations in the past to use the Sunrise but the math
never worked out to be better than a dual inverter set up after I factored
the other advantages of a dual inverter set up (2 times the power, 2 battery
chargers and a standard well pump vs. an odd ball pump that I would have to
pull every time it failed).  Also, I have never used the AC Grundfos but
what little info I have on it only shows a TDH of up to 300'.   I'd like to
get a Sunrise installed near but I must admit to being very nervous about DC
water pumps.  For some reason DC pumps have been very unreliable (100%
problem rate) around here and tortured me.

A Dual 3624 power panel lists for under $4800 and then someone else gets to
worry about servicing the pump.  If I use a Sunrise at over $5000 (pump,
controller, dedicated PV array, extra pressure tanks etc) I get to trouble
shoot the pump and anything else that goes wrong with the water system.   No
well service guy around here would touch anything to do with the system if
it had a DC pump so any problems I get to eat which I don't like that idea
at all.

Any suggestions?  I know I'm not seeing the full picture.  Thanks in
advance.

Travis Creswell
Ozark Solar

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