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 offgridso...@sti.net
<mailto:offgridso...@sti.net> text 209 813 0060*
On Thu, 17 Sep 2020 09:30:43 -0600, Ray <r...@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 d...@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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