[RE-wrenches] Another pump quesiton

[Ray]

I've definitely had some Grundfos failures from the way back days, but 
their Alpha ECM circulator series has been really solid, as well as 
Taco's ECM drive circulators.  To be clear ECM is variable speed drive 
VSD, but not variable frequency drive VFD. ECM varies DC voltage to a DC 
motor to vary speed, while VFD varies frequency to a 3 phase motor to 
vary speed.

Or at least that's the way my feeble mind understands it......

Ray Walters
Remote Solar
303 505-8760

On 9/17/20 9:42 AM, Dave Angelini Offgrid Solar wrote:
>
> Look at the recent Grundfos Scala2 recall, they have sold some really 
> bad pumps, so AC is not always best. For Offgrid a spare inverter is 
> often called for because critical systems do need back-up. Many 
> applications/requirements are different.
>
> Grundfos scala2 pump recall
> They have been *recalling* or "updating" all VFD type *pumps* for 30+ 
> years now. It is all part of their planned obsolescence. The more 
> electronics you have in a *pump* system, the less likely water is to 
> come out of a faucet when opened, and the more it is going to cost you
>
> Winter is coming :)
>
>   
> *Dave Angelini Offgrid Solar "we go where powerlines don't" 
> http://members.sti.net/offgridsolar/ e-mail offgridsolar at sti.net 
> <mailto:offgridsolar at sti.net> text 209 813 0060*
>
> On Thu, 17 Sep 2020 09:30:43 -0600, Ray <ray at solarray.com> wrote:
>
>> Actually best of all:  you don't have to run low voltage DC circuits 
>> to the pump room.  Another thing about the ECM drive pumps, they have 
>> much higher flow rates available than the El Cids.  And if you're 
>> worried about your old school street cred in the off grid world, they 
>> are still technically DC at the drive, for those old timers that 
>> insist on DC.
>>
>> Ray Walters
>> Remote Solar
>> 303 505-8760
>> On 9/17/20 6:54 AM, Dana Orzel wrote:
>>>
>>> I have El-cids in stock & am selling them off.
>>>
>>> I have switched to the new AC technology that Grundfoss & TACO 
>>> offer. They are called ECM pumps. Electronically Commutated Pump 
>>> motors. AC-DC motors, soft start, variable speed, super-efficient, 
>>> best of all very QUIET!
>>>
>>> Dana Orzel                              Great Solar Works, Inc.
>>>
>>> *C - 208.721.7003 dana at solarwork.com*
>>>
>>> Idaho Contractor - # 028765         Idaho PV # 028374
>>>
>>> NABCEP # 051112-136 www.solarwork.com <http://www.solarwork.com/>
>>>
>>> "Responsible Technologies for Responsible People since 1988"
>>>
>>> *P*Please consider the environment before printing this email.
>>>
>
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