[RE-wrenches] Retrofit variable speed drive to old well pump?

[Dan Fink]

Michael; Battery bank voltage at 75% SOC is around 24.7v, so it's in the
ballpark and the battery bank has only about 3 years on it (8 x L-16) and
not much abuse.

Dan Fink
Adjunct Professor of Solar Energy Technology, Ecotech Institute
IREC Certified Instructor™ for:
~ PV Installation Professional
~ Small Wind Installer
Executive Director, Buckville Energy
NABCEP Registered Continuing Education Providers™
970.672.4342



On Sat, Dec 10, 2016 at 10:34 AM, Shasta Daiku <mjmorningstar at gmail.com>
wrote:

> What is the battery voltage when the client says that SOC is %75?
>
> VFD driven pumps are three phase. There are single phase “soft start”
> controllers for pumps and motors designed for that application, but not for
> a two wire fed submersible pump. The pump, for mechanical reasons, not just
> electrical,  may may be resisting start up.
>
> Michael
>
> On Dec 10, 2016, at 9:11 AM, Dan Fink <danbob88 at gmail.com> wrote:
>
> Hi Bob; I checked the connections for corrosion, and the wire size looks
> like "the usual" for up here in this area, it's only about 100 feet and the
> usual well depth around here is 350 ft. Running stouter wire might be an
> option to consider...but that's a lot of digging. I'm just hoping VSD might
> be a quick and dirty solution.
>
> Dan Fink
> Adjunct Professor of Solar Energy Technology, Scotch Institute be
> IREC Certified Instructor™ for:
> ~ PV Installation Professional
> ~ Small Wind Installer
> Executive Director, Buckville Energy
> NABCEP Registered Continuing Education Providers™
> 970.672.4342
>
>
>
> On Sat, Dec 10, 2016 at 9:53 AM, RE Ellison <reellison at gmail.com> wrote:
>
>> Don't know about the variable speed but are the wires feeding the pump
>> large enough for the distance?
>> Sounds like it might be voltage starved because of a high resistance /
>> bad connection or a long wire run and the need for a larger wire ?
>>
>> Just a thought,
>> Bob Ellison
>>
>> On Dec 10, 2016, at 11:39 AM, Dan Fink <danbob88 at gmail.com> wrote:
>>
>> Esteemed Wrenches;
>>
>> I have a client in a very remote mountain location who is having trouble
>> with his inverter starting his well pump when battery state of charge is
>> below 75%. 24v system, Magnum inverter.
>>
>> It's a 2-wire pump, unknown age, model, horsepower, or well depth. It has
>> always given him trouble, that's why he upgraded to 24v, and the situation
>> is better, but not ideal yet. I don't think adding a hard start capacitor
>> would help as there should be one inside the pump itself, though I suppose
>> it could be blown.
>>
>> Because of the distance and the rough road, it would be super expensive
>> for a well company to come up there, pull the old pump and set a new,
>> modern soft-start one.
>>
>> Has anyone here had any experience with retrofitting variable speed drive
>> units to an unknown pump? If so, what models have you tried and what do you
>> prefer?
>>
>> Thanks;
>>
>> Dan Fink
>> Adjunct Professor of Solar Energy Technology, Ecotech Institute
>> IREC Certified Instructor™ for:
>> ~ PV Installation Professional
>> ~ Small Wind Installer
>> Executive Director, Buckville Energy
>> NABCEP Registered Continuing Education Providers™
>> 970.672.4342
>>
>>
>>
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