Hi Allan,
In answer to your question: Yes, we're developing an AC side 4kW diversion mode controller which allows temperature compensated three stage charging for AC coupled inverter applications. It is currently in beta site testing. Brian Faley Chief Engineer Magnum Energy Inc. 2211 West Casino Rd Everett, WA 98204 Ph 425-353-8833 www.magnumenergy.com From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Allan Sindelar Sent: Thursday, March 07, 2013 2:41 PM To: RE-wrenches Cc: Support Subject: Re: [RE-wrenches] AC Coupled Magnum Issue McAfee SiteAdvisor Warning This e-mail message contains potentially unsafe links to these sites: <http://www.siteadvisor.com/sites/athens-electric.com/?pip=false&premium =true&client_uid=446795512&client_ver=3.6.0.187&client_type=IEPlugin&sui te=true&aff_id=0&locale=en_us&ui=1&os_ver=6.1.1.0> http://athens-electric.com/ OK, a bit more: The line diagram I was referencing was dated 5/1/2010. A later diagram from a Powerpoint given at last year's NABCEP CE conference shows a "MagNet" AC diversion controller. It allows AC diversion loads and three-stage charging. No mention of temp comp. Magnum needs to weigh in on this. Allan Allan Sindelar al...@positiveenergysolar.com <mailto:al...@positiveenergysolar.com> NABCEP Certified Photovoltaic Installer NABCEP Certified Technical Sales Professional New Mexico EE98J Journeyman Electrician Founder and Chief Technology Officer Positive Energy, Inc. 3209 Richards Lane (note new address) Santa Fe, New Mexico 87507 505 424-1112 www.positiveenergysolar.com <http://www.positiveenergysolar.com/> On 3/7/2013 3:00 PM, Drake wrote: Hello Wrenches, I had an unexpected glitch in AC coupling a Magnum 4024 PAE inverter. The system utilizes AGM batteries, which (according to Concorde tech support) have a very strict upper voltage limit. The relay used to stop the current input from the direct grid tie inverter, when battery voltage is high, is controlled by a Morningstar Relay Driver. The relay driver is set to shut off the charge at 28.8 volts. The charger on the Magnum is set to charge the batteries to 28.6 volts. The plan was to be able to charge batteries from the Magnum without tripping the AC connection between the grid tie inverter to the grid. The Magnum should charge to 28.6 volts, 0.2 volts below the relay driver's programmed trigger point. There is one catch to using this approach. The Magnum inverter has a remote temperature sensor in the battery bank. The relay driver is not temperature corrected. Therefore, when the batteries are cold, the charging voltage goes up in the Magnum. This higher voltage trips the relay controlled by the driver, and disconnects the grid tie inverter from the grid. I've played with the voltage set points, but the charge voltage on the Magnum would be too low for good battery maintenance. If these were liquid electrolyte batteries, I'd crank up the voltage on the relay driver. Since they are AGM batteries, it doesn't seem like a good idea to do that. The work around for this at present is to; * Charge batteries at night in the winter * No problem is expected in the summer The batteries are in an insulated box in a shed connected to the house. The inside of the battery box has a screened hole that is supposed to allow heated air into the box. This vent doesn't keep the batteries warm enough to prevent the problem. Is there a temperature sensitive, voltage controlled relay or diver available? Has anyone used a temperature bulb with the relay driver in a way that could solve this problem? Has anyone else come up against this issue, and if so, what was your solution? Thanks, Drake Drake Chamberlin Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified Solar PV Installer 740-448-7328 http://athens-electric.com/ _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address & 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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