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 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 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> <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 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
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