Battery Backup Considerations - Zenith Aircraft Builders and Flyers2024-03-28T14:29:57Zhttps://zenith.aero/forum/topics/battery-backup-considerations?commentId=2606393%3AComment%3A393255&feed=yes&xn_auth=noBrad,
Thx much. Don...tag:zenith.aero,2014-11-20:2606393:Comment:3942812014-11-20T23:38:53.059ZDon Morriseyhttps://zenith.aero/profile/DonaldMorrisey
Brad,<br />
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Thx much. Don...
Brad,<br />
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Thx much. Don... Don -
Here is a snip from th…tag:zenith.aero,2014-11-20:2606393:Comment:3938352014-11-20T17:37:36.598ZBrad Rawlshttps://zenith.aero/profile/BradRawls
<p>Don -</p>
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<p>Here is a snip from the website.</p>
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<p>Brad</p>
<p>Don -</p>
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<p>Here is a snip from the website.</p>
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<p>Brad</p> Brad,
I couldn't find it...d…tag:zenith.aero,2014-11-20:2606393:Comment:3940902014-11-20T00:56:58.143ZDon Morriseyhttps://zenith.aero/profile/DonaldMorrisey
Brad,<br />
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I couldn't find it...do you have a link. Thanks for the help.<br />
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Don
Brad,<br />
<br />
I couldn't find it...do you have a link. Thanks for the help.<br />
<br />
Don Don -
Check out the dual bat…tag:zenith.aero,2014-11-19:2606393:Comment:3940592014-11-19T20:51:33.241ZBrad Rawlshttps://zenith.aero/profile/BradRawls
<p>Don -</p>
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<p>Check out the dual battery setup on the Viking website. Viking uses an ECU and electric fuel pumps, so you have the same issues. Their system is real simple and easy to wire. With the dual batteries you can run on battery #1, #2, or both. Normal operation is to fly on battery #1 on the outgoing leg and #2 on the return, that way both batteries are kept at full charge. Only one battery is charged at a time, so there are no alternator issue and you always have a fully…</p>
<p>Don -</p>
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<p>Check out the dual battery setup on the Viking website. Viking uses an ECU and electric fuel pumps, so you have the same issues. Their system is real simple and easy to wire. With the dual batteries you can run on battery #1, #2, or both. Normal operation is to fly on battery #1 on the outgoing leg and #2 on the return, that way both batteries are kept at full charge. Only one battery is charged at a time, so there are no alternator issue and you always have a fully charged extra battery if you fail to catch the discharge on the battery you are currently running on. Pretty much the only time you would want both batteries on at the same time would be if you needed the extra juice for a cold weather start.</p> Don,
A "regular" Rotax has a…tag:zenith.aero,2014-11-18:2606393:Comment:3931772014-11-18T17:08:51.883ZKen Ryanhttps://zenith.aero/profile/KenRyan
<p>Don,</p>
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<p>A "regular" Rotax has an ignition system that generates its own power. Your 912iS does not. Your 912iS must have power for the ECU and for the fuel pumps. This power can come from battery or alternator. These comparisons to the carbureted Rotax engines are not valid. Your ignition system is completely different.</p>
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<p>Ken</p>
<p>Don,</p>
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<p>A "regular" Rotax has an ignition system that generates its own power. Your 912iS does not. Your 912iS must have power for the ECU and for the fuel pumps. This power can come from battery or alternator. These comparisons to the carbureted Rotax engines are not valid. Your ignition system is completely different.</p>
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<p>Ken</p> well part of the process is e…tag:zenith.aero,2014-11-18:2606393:Comment:3932552014-11-18T16:30:33.213ZDon Morriseyhttps://zenith.aero/profile/DonaldMorrisey
<p>well part of the process is education...I didn't realize a Rotax engine would keep running with battery removed so I feel a lot better about only having one (battery). Nevertheless I'm going to do some investigating on the TCW Tech backup, to see if the benefits may outweigh the cost and weight gain. Thanks to all for responding.</p>
<p>well part of the process is education...I didn't realize a Rotax engine would keep running with battery removed so I feel a lot better about only having one (battery). Nevertheless I'm going to do some investigating on the TCW Tech backup, to see if the benefits may outweigh the cost and weight gain. Thanks to all for responding.</p> You can't make an informed de…tag:zenith.aero,2014-11-18:2606393:Comment:3929102014-11-18T15:23:48.901ZKen Ryanhttps://zenith.aero/profile/KenRyan
<p>You can't make an informed decision until you know how much energy you need. It sounds like all you are concerned with is keeping the engine going so that probably means ECU + fuel pumps. Find out what they consume and compare it to any battery you are considering. It looks to me like the 2 amp and 4 amp devices you are looking at are designed for EFIS etc. not fuel pumps which might draw 4 or 5 amps (just a guess). I believe the Rotax 912iS already has dual (independent) alternators. If…</p>
<p>You can't make an informed decision until you know how much energy you need. It sounds like all you are concerned with is keeping the engine going so that probably means ECU + fuel pumps. Find out what they consume and compare it to any battery you are considering. It looks to me like the 2 amp and 4 amp devices you are looking at are designed for EFIS etc. not fuel pumps which might draw 4 or 5 amps (just a guess). I believe the Rotax 912iS already has dual (independent) alternators. If that is the case I would think that a decent sized battery like an EarthX dash 36 model would give you triple redundancy. I'm sure the Rotax monitor will tell you if you lose an alternator. If that happens shed unnecessary loads and head home. Seems to me that triple redundancy should be good enough, and an additional battery wouldn't serve much purpose. Where do you stop? Why just two batteries? Why not three or four? Why not add a wind generator and some solar panels. What does Rotax advise? If they are good with a single battery, I would be too.</p> Don,
I like the idea of a swi…tag:zenith.aero,2014-11-18:2606393:Comment:3929842014-11-18T14:40:44.936ZDavid J. Beaulieuhttps://zenith.aero/profile/DavidJBeaulieu
<p>Don,</p>
<p>I like the idea of a switching system with battery back up - whether you build it yourself or purchase off the shelf. For the type of flying I plan on doing - VMC, remote, single ship with electronic ignition and electric fuel pumps for the UL350iS it makes sense to me.</p>
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<p>I'd certainly go for the second battery (battery backup) of some sort versus dual alternator...</p>
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<p>Dave</p>
<p>Don,</p>
<p>I like the idea of a switching system with battery back up - whether you build it yourself or purchase off the shelf. For the type of flying I plan on doing - VMC, remote, single ship with electronic ignition and electric fuel pumps for the UL350iS it makes sense to me.</p>
<p></p>
<p>I'd certainly go for the second battery (battery backup) of some sort versus dual alternator...</p>
<p></p>
<p>Dave</p> Put in a low voltage pizo to…tag:zenith.aero,2014-11-18:2606393:Comment:3930812014-11-18T02:52:03.941ZJesse Hartmanhttps://zenith.aero/profile/JesseHartman
<p>Put in a low voltage pizo to get your attention. Remember you only have one crankshaft, camshaft , prop , radiator, ecu. How redundant are we really?</p>
<p>Put in a low voltage pizo to get your attention. Remember you only have one crankshaft, camshaft , prop , radiator, ecu. How redundant are we really?</p> Pat, The 912is is electricall…tag:zenith.aero,2014-11-18:2606393:Comment:3930752014-11-18T01:59:20.529ZDon Morriseyhttps://zenith.aero/profile/DonaldMorrisey
Pat, The 912is is electrically dependent, yes you have the amount of juice that's left in the battery but if it goes, it goes...it's all about redundancy. I've never had a battery failure either but they happen...and what happens if you don't notice right away for some reason.<br />
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Ken in answer to your question, I want as much backup as is reasonably available?..I'm not sure yet if it would work with the Rotax ECU's, it does state it will run a single light speed plasma ignition system. My goal…
Pat, The 912is is electrically dependent, yes you have the amount of juice that's left in the battery but if it goes, it goes...it's all about redundancy. I've never had a battery failure either but they happen...and what happens if you don't notice right away for some reason.<br />
<br />
Ken in answer to your question, I want as much backup as is reasonably available?..I'm not sure yet if it would work with the Rotax ECU's, it does state it will run a single light speed plasma ignition system. My goal would be to have enough juice to get on the ground...30 to 60 minutes.