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 --- On Wed, 2/11/09, boB Gudgel <b...@midnitesolar.com> wrote: > From: boB Gudgel <b...@midnitesolar.com> > Subject: Re: [RE-wrenches] Magnum MS4448AE Compatibility Question > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Wednesday, February 11, 2009, 12:03 AM > Peter Parrish wrote: > > > > As an old Ham Radio Operator, it would seem the > solution is very simple. First, I assume that the voltage is > compliant and so is the frequency. The problem is high > frequency noise (hash from the switching circuitry) on the > waveform that has not been filtered out. Figure out the > switching frequency and get a low-pass filter whose cutoff > is below the switching frequency but above 60 Hz. Make sure > the filter is rated for the load, but since we’re taking > about a burner control/igniter, we’re talking low-power, > correct? LPFs are low-cost commodity items, probably in > DigiKey or similar catalogs. > > > > - Peter > > > > 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 > > > > > > Peter T. Parrish, President > > California Solar Engineering, Inc. > > 820 Cynthia Ave., Los Angeles, CA 90065 > > Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 > > CA Lic. 854779, NABCEP Cert. 031806-26 > > peter.parr...@calsolareng.com > > > > > ------------------------------------------------------------------------ > > > > *From:* re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On > Behalf Of *David Katz > > *Sent:* Monday, February 09, 2009 9:31 PM > > *To:* al...@positiveenergysolar.com; RE-wrenches > > *Subject:* Re: [RE-wrenches] Magnum MS4448AE > Compatibility Question > > > > Hi Allan, > > This is not an unusual problem. i have seen it with > conventional forced air heating systems. The burner controls > would not run on A Xantrex or Outback sine wave inverter. > There is something about waveforms from inverters designed > by Trace legacy engineers. I had to put in Exeltech or > Studer inverters to operate the heating control system. you > can do this and still run larger pumps and fans on the > Magnum. > > David > > > > David Katz > > > > President > > > > AEE Solar > > > > 1155 Redway Drive > > > > P.O. Box 339 > > > > Redway, CA 95560 > > > > Tel (707) 825-1200 > > > > Fax (707) 825-1202 > > > > da...@aeesolar.com <mailto:da...@aeesolar.com> > > > > www.aeesolar.com <http://www.aeesolar.com> > > > > DISCLAIMER: > > This communication, along with any documents, files or > attachments, is intended for the use of only the addressee > and contains privileged and confidential information. If you > are not the intended recipient, you are hereby notified that > any dissemination, distribution or copying of any > information contained in or attached to this communication > is strictly prohibited. If you have received this message in > error, please notify the sender immediately by e-mail reply > and destroy the original communication and its attachments > without reading, printing or saving in any manner. > > > > P Please consider the environment before printing this > e-mail. > > > > > > > > Allan Sindelar wrote: > > > > Wrenches, > > We have an unusual problem, and I need to know if > anyone else has had this > > or a related problem, and what to do about it. > > This concerns a new off-grid residential system, very > conventional: 1,800W > > PV, Midnite E-Panel with Magnum MS4448-AE inverter, > MX60, 16 S-460s, > > installed summer 2008. This existing home is being > extensively remodeled, > > and the home is not yet occupied. A local mechanical > contractor installed a > > new infloor radiant (gypcrete) hydronic heating system > using a > > Netherlands-made (German company) Buderus GB142 > high-efficiency boiler. The > > problem is that the boiler won't start reliably on > the inverter. It appears > > that the hot-surface igniter does not get full AC > voltage (it runs on > > straight 120V AC, but is supplied through the > boiler's control circuitry). > > We tested the igniter by disconnecting it and plugging > it straight into > > inverter AC and it lit right up. The mechanical > contractor has tried a replacement Buderus GB142 boiler with > > the same result. I was told that they brought out a > generator and it also > > failed to ignite on generator AC, but not knowing the > generator used or the > > way it was wired (I believe an extension cord to a > portable) I don't put > > much weight on this data. They also took a Lochinvar > Boiler to the site to > > test the theory that a different manufacturer's > boiler might work. The > > Lochinvar boiler, which uses a different control and a > spark ignition rather > > than a hot surface igniter, worked on site without any > problems. > > I'm looking for solutions. Magnum tech support had > not heard of this. Have > > you? Also, if indeed we have an inverter that is > incapable of running this load, > > how do we make it right to the homeowner and the > mechanical contractor? What > > should be Magnum's obligation? What should be > ours? This issue hasn't come > > up here since the days when the Trace SW mod-sine > series was the waveform > > standard. > > Thanks, > > Allan Sindelar > > allan_(at)_positiveenergysolar.com > <mailto:al...@positiveenergysolar.com> NABCEP > certified solar PV installer > > Positive Energy, Inc. > > 3225A Richards Lane > > Santa Fe NM 87507 > > 505 424-1112 > > > > > > > ------------------------------------------------------------------------ > > > > > > _______________________________________________ > > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > <mailto:RE-wrenches@lists.re-wrenches.org> > > Options & settings: > > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm > <http://www.re-wrenches.org/etiquette.htm> > > Check out participant bios: > > www.members.re-wrenches.org > <http://www.members.re-wrenches.org> > > > ------------------------------------------------------------------------ > > > > _______________________________________________ > > List sponsored by Home Power magazine > > > > List Address: RE-wrenches@lists.re-wrenches.org > > > > Options & settings: > > > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > > > List rules & etiquette: > > www.re-wrenches.org/etiquette.htm > > > > Check out participant bios: > > www.members.re-wrenches.org > > > > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
