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jrevens
Joined: 21 Nov 2013
Posts: 34
Location: Arvada, CO
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 Posted: Mon Aug 01, 2016 3:06 pm Post subject: Re: Intermittent Battery Failure |
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I have a friend building a RANS S-19. Not flown yet - new Rotax 912 ULS, PC-680 battery and Dynon panel. The charging voltage seems low. We've measured it at the battery and it agrees closely with the Dynon readout. The voltage at 1900 rpm today was 13.5 v, but has been seen to be only in the upper 12 v range sometimes when taxiing. Some other readings - 2000 rpm 13.4 v, 2400 13.7, 3500 13.8, 4000 13.9. We ran the lights and panel for awhile with the engine off to get the battery voltage down to about 10.5, then started the engine and got similar readings. The two brand new voltage regulators, the Rotax supplied Ducati and a Silent Hektik, produced the same results. Electrical is basically as per Bob's Z-16. Now I'm wondering about the possibility of a bad battery, or possibly even a weak dynamo. Any thoughts or suggestions for possible tests?
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John Evens
Thorp T-18 N71JE (sold)
Kitfox SS7 N27JE (built & flying) |
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Mon Aug 01, 2016 3:44 pm Post subject: Re: Intermittent Battery Failure |
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Your voltages sound normal for the Rotax charging system. I have a Van's RV-12 with similar voltages, same engine, same battery. The engine starts so quickly that the battery does not run down much. 13.8 volts seems to be working fine for hundreds of flying RV-12s. The bad news is that the Ducati regulators have a high failure rate.
A John Deere regulator gives a few tenths of a volt more, but the terminals are swapped around and the mounting holes do not align. Search eBay for AM101406, or MIA881279, or JDR1406.
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Joe Gores |
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jrevens
Joined: 21 Nov 2013
Posts: 34
Location: Arvada, CO
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| Posted: Mon Aug 01, 2016 6:26 pm Post subject: Re: Intermittent Battery Failure |
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Thanks Joe. The issue came up in our minds because another friend with a new S-19 does seem to be running a few tenths higher with the same engine, etc., and I was thinking about the recent discussions on this forum stating that 14.2 to 14.5 or so was what you really wanted with these batteries. The one in question actually is using a different regulator... the Silent Hektik. It's really a nice looking regulator & rated for much higher amperage. He just swapped it out with a Ducati to see if there was a difference.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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John Evens
Thorp T-18 N71JE (sold)
Kitfox SS7 N27JE (built & flying) |
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Tue Aug 02, 2016 5:20 am Post subject: Re: Intermittent Battery Failure |
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There are lots of owners of Rotax powered aircraft in the USA who would replace the Ducati regulator with a Silent Hektik if they could find a dealer willing to sell to USA customers.
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Joe Gores |
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