[RE-wrenches] TIny House Pump

[Dan Fink]

I have had very few reliability issues with the Shurflo 2088 series, and
have a dozen of them in the field for clients in 12V, 24V and 120VAC. My
house is full-time, as is my guest cabin, both have 2, one 12V for house
pressure and one 120VAC underground for filling the cisterns from springs.

The diaphragm pump head is easy to rebuild or replace, as is the pressure
switch. I've only had to do that once at my house, after 15 years of
service.

I recommend the heat sink version at 12V, that can be a failure point if
run time is extended. Other failure point - lightning with the underground
spring pumps.

ALWAYS use a pressure tank, even if it's just the little Shurflo one,
otherwise they surge and pulse, which will reduce motor lifetime
drastically.

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 Fri, Oct 28, 2016 at 1:13 PM, Ray Walters <ray at solarray.com> wrote:

> Greetings Esteemed Wrenches:
>
> We have a tiny house project, and need to supply the pressure pump. My go
> to pump has been the Grundfos MQ series of constant pressure pumps.  They
> have no start up surge, and don't require an external pressure switch or
> pressure tank.  For small part time cabins, we've used the Shurflo or
> Aquatec diapraghm pumps.
> In this case, I fee that the Grundfos is overkill at 10 GPM, and that the
> RV pumps won't last very long in full time use.  Any other choices out
> there I should be looking at?
> I'm thinking 3 GPM max will be fine, but I would like something more
> reliable.  The pump would be preferred to be 120 vac, but I might consider
> a 24 vdc unit if it otherwise fits the bill.
>
> As always, thanks in advance for all your comments and suggestions.
>
> --
> R.Ray Walters
> CTO, Solarray, Inc
> Nabcep Certified PV Installer,
> Licensed Master Electrician
> Solar Design Engineer
> 303 505-8760
>
>
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