[RE-wrenches] Magnum MS4448AE Compatibility Question

[robert ellison]

Seems that I remember that the APC and other backups are not a sine wave but
a modified wave? But it's been a while.

Bob

On Wed, Feb 11, 2009 at 9:52 AM, Howie Michaelson <howie at suncatchervt.com>wrote:

> I installed an off-grid system with identical symptoms:
>
> OB VFX 3648 dual stack
> Buderus GB142-24
> Kohler 12 kW propane genny
>
> The boiler runs fine on the inverter power, but will occasionally error
> out (6A) and shut down while the generator is running (usually after it
> has been on for hours).  The plumber installed an APC uninterruptable
> power supply/surge suppressor (not sure of the model) before the boiler,
> but when running on the internal inverter, the symptoms seemed to get
> worse.  When running on just the surge suppressor portion, the symptoms
> were the same as if the APC wasn't in-line.  We've checked the grounding
> at the genny, made sure the neutral was isolated except for the main
> panel, still the same problem.  Seems this is a Buderus issue (or at least
> not an inverter one) - see:
>
>
> http://www.buderus.net/Support/TechnicalInfoForums/tabid/132/forumid/15/threadid/4334/scope/posts/Default.aspx
>
> I haven't been able to make the boiler run reliably when the genny is on,
> which is a problem in our climate, when the client goes away in the
> winter...
>
> Howie
> --
> Howie Michaelson
> NABCEP Certified Solar PV Installer™
>
> Sun Catcher, LLC
> Renewable Energy Systems Sales and Service
> VT Solar & Wind Incentive Program Partner
> http://www.SunCatcherVT.com <http://www.suncatchervt.com/>
> (cell) 802-272-0004
> (home) 802-439-6096
>
>
> On Wed, February 11, 2009 7:47 am, Darryl Thayer wrote:
> > Some of the hot surface ignitors I have seen draw a lot of current, in
> the
> > order of amps.  I would expect the inverter to drop out if it were
> > overloaded however.  Also does the magnum drop voltage at very low loads?
> > Where the furnace controls can not function due to low voltage or poor
> > wave shape.
> >
> > Darryl
> >
> >
> >>
> >> This may be true about high frequency switching interfering
> >> with something, but I believe the problem with this ignitor
> >> is that it is a very poor design. Judging by what I read on
> >> their company forum, it doesn't look like they have a
> >> clue about
> >> this problem. Maybe you can go inside the Buderus and
> >> filter something there or maybe you can fine another product
> >> to try ?
> >>
> >> boB
>
>
>
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