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Need to increase built-in Voltage Regulator limit by .5V

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peter(at)schwenn.com
Guest

Posted: Thu May 03, 2018 10:05 am Post subject: Need to increase built-in Voltage Regulator limit by .5V

AeroElectrocutors,



Rotax 912iS internal voltage regulator cutoff is 14.2.  Lithium-IRON (LiFePO4) needs 14.7 for full and timely charge.

I can't reasonably modify the internal regulator.

Is there a reasonable way to get 14.7V?

Thanks,

Peter Schwenn

P.S. Why would I want to use a lithium-iron battery? Don't Lithium-Ion batteries have a host of problems?

     In my experience they have just one: if fully discharged (approx: <10 V) they can be difficult and slow to recover. 

    They don't overheat or catch fire (as LiPo, LiCoO2,...can),  They contain nothing toxic or hazardous.  They needn't be charged slowly.  They can supply current rapidly.  They don't require a protective or heavy enclosure.

     All battery types differ in their requirements.  Lithium-Iron requires a special charger; for balancing cells, recovery from discharge, and NOT performing operations other types may require.



240-602-6931



6514 41st Av. U Park MD 20782

Eaa4 & Xenos N32XS (at) KCGS

N16XN under construction -

     Rivetless skins for Laminar Flow

http://www.schwenn.com

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user9253

Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan

Posted: Thu May 03, 2018 11:00 am Post subject: Re: Need to increase built-in Voltage Regulator limit by .5V

14.2 volts might be OK.  Van's Aircraft put the new 912iS in their latest RV-12 along with a Lithium battery.  Read what EarthX has to say:

https://earthxbatteries.com/engine-charging-systems-use-lithium-batteries

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_________________
Joe Gores

peter(at)schwenn.com
Guest

Posted: Mon May 07, 2018 1:40 am Post subject: Need to increase built-in Voltage Regulator limit by .5V

14.2 will charge a LiFePo battery but only about halfway and slowly. I use 3 Shorai LiFePo and an ultra light Micro (4ah) in a Ducati.  They all share the 4.7V requirement.  Since high rates of discharge and charge, and very low loss rate are properties of these cells, it doesn't make sense to use half the capacity - as it wouldn't for any battery.



[I appreciate the info for EarthLink aircraft LiFePo - they are the best, with a good controller built-in, and the fullest explanation of all details of charging.  Very expensive except that one is unlikely to destroy their batteries.]



240-602-6931





On May 3, 2018 04:43, "Peter Schwenn" <peter(at)schwenn.com (peter(at)schwenn.com)> wrote: 	  Quote: 	
		  AeroElectrocutors,



Rotax 912iS internal voltage regulator cutoff is 14.2.  Lithium-IRON (LiFePO4) needs 14.7 for full and timely charge.

I can't reasonably modify the internal regulator.

Is there a reasonable way to get 14.7V?

Thanks,

Peter Schwenn

P.S. Why would I want to use a lithium-iron battery? Don't Lithium-Ion batteries have a host of problems?

     In my experience they have just one: if fully discharged (approx: <10 V) they can be difficult and slow to recover. 

    They don't overheat or catch fire (as LiPo, LiCoO2,...can),  They contain nothing toxic or hazardous.  They needn't be charged slowly.  They can supply current rapidly.  They don't require a protective or heavy enclosure.

     All battery types differ in their requirements.  Lithium-Iron requires a special charger; for balancing cells, recovery from discharge, and NOT performing operations other types may require.



240-602-6931



6514 41st Av. U Park MD 20782

Eaa4 & Xenos N32XS (at) KCGS

N16XN under construction -

     Rivetless skins for Laminar Flow

http://www.schwenn.com

- 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:

http://www.matronics.com/Navigator?AeroElectric-List

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