[RE-wrenches] Magnum MS4448AE Compatibility Question

[Howie Michaelson]

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
(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