[RE-wrenches] Outback wave form

Chris Mason cometenergysystems at gmail.com
Tue Apr 16 17:19:47 PDT 2013


If it is useful to you, I can grab a waveform from my scope connected to my
outback and post it.




On Tue, Apr 16, 2013 at 3:27 PM, All Solar <allsolar at scswifi.net> wrote:

> coffee machine is a Miele CVA 4066.
>
> Sent from Jeremy's IPhone.  Sorry for typos and shorthand!
>
> On Apr 16, 2013, at 12:46 PM, boB <boB at midnitesolar.com> wrote:
>
> >
> > I believe these problems are mainly due to the high frequency switching
> content of the typical sinewave inverter
> > these days.
> >
> > I (and other manufacturers I'm sure)  would be very interested to know
> which appliances are susceptible to
> > this  noise so that we can try to reduce these incompatibilities.    I'm
> sure we can't take care of 100% of
> > the incompatibilities but we can try to get closer.
> >
> > For instance, what kind of coffee maker was that, Jeremy ?
> >
> > boB
> >
> >
> >
> > On 4/16/2013 11:36 AM, Bruce Erickson wrote:
> >> I'm having a similar issue with a GRID-TIE inverter just now. SMA
> 5000US which, when it wakes up every morning, removes the date and time
> from the programming in the customers' Monitor brand kerosene heater. They
> have to re-enter it daily, which is annoying enough, but when they go out
> of town, they have to leave the inverter off to avoid coming home to a cold
> house.
> >>
> >> So far SMA has had us move the breaker as far as possible from the
> heater breaker, to no avail. They had no other suggestions. I used a
> Panamax plug-in power conditioner with 50 dB of EMI filtering on the heater
> outlet, which has reduced the frequency of the problem to once a day, when
> it wakes up, from a few times a day. Trying a different heater is out of
> the question due to cost, so I'm stumped as how to avoid an unhappy
> customer, unless the answer is experimenting with more robust power
> conditioners.
> >>
> >> Bruce Erickson
> >> Mendocino Solar Service
> >> PO Box 1252
> >> Mendocino, CA 95460
> >> 707-937-1701
> >> 707-937-1741 fax
> >> bruce at mendocinosolar.com
> >>
> >>
> >>
> >>
> >> On Apr 16, 2013, at 11:12 AM, Dave Palumbo wrote:
> >>
> >>> Jeremy,
> >>>
> >>> << What to look for? >>
> >>>
> >>> Unfortunately, probably a different coffee maker.
> >>> I've gone through this with several different appliances over the
> years on
> >>> sine wave inverter output. Washing machines, refrigerators,
> dishwashers it
> >>> could be anything with electronics. Specific manufacturers typically
> cannot
> >>> be avoided in order to solve this issue. Year to year manufacturers may
> >>> change the design of their appliances, so blanket statements on what
> works
> >>> and what doesn't are unreliable. All appliances (excepting a few) are
> >>> designed to operate on utility power, not inverter power. Inverter
> power
> >>> (excepting Exeltech and possibly others) typically has more distortion
> than
> >>> utility power. Some appliances cannot tolerate the simulated inverter
> sine
> >>> wave power. I always council my inverter customers that I cannot
> guarantee
> >>> that all appliances with work flawlessly and that some may not work at
> all.
> >>> I advise off-grid clients to buy appliances where there is a liberal
> return
> >>> policy.
> >>>
> >>> David Palumbo
> >>> Independent Power LLC
> >>> 462 Solar Way Drive
> >>> Hyde Park, VT 05655
> >>> www.independentpowerllc.com
> >>> Vermont Solar Partner
> >>> 25 Years Experience, (802) 888-7194
> >>>
> >>>
> >>>
> >>>
> >>> -----Original Message-----
> >>> From: re-wrenches-bounces at lists.re-wrenches.org
> >>> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of All
> Solar
> >>> Sent: Tuesday, April 16, 2013 12:47 PM
> >>> To: re-wrenches at lists.re-wrenches.org
> >>> Subject: [RE-wrenches] Outback wave form
> >>>
> >>> Have a client with a new coffee maker that will not run from their new
> dual
> >>> outback setup. Has anyone heard of this lately. We have had no
> problems with
> >>> appliances and sine wave inverters. What to look for?
> >
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-- 
Chris Mason
President, Comet Systems Ltd
www.cometenergysystems.com
Cell: 264.235.5670
Skype: netconcepts
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