For those of you operating under the LAA system there is a Standard Mod SM
14337 that gives details of approved Lithium batteries. Just a note of
caution when using batteries with a Battery Management System (BMS) that
automatically disconnects the battery if over or under charged. The Rotax
built in alternator produces avionics damaging voltages when the battery is
disconnected. An overvolt protection circuit should be fitted to guard
against this.
At the moment the Mod cannot be used for the 914 because it relies on a
working electrical system. The range of batteries will be updated as more
data becomes available from the manufactures. What has already become clear
is that not all lithium batteries are suitable.
Brian
G-DDBD
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Greg Fuchs
Sent: 09 September 2017 20:30
Subject: RE: Europa-List: Battery
Paul,
The ETX36C has been used successfully for years. The Rotax 914 charging
system needs to be slightly modified to bring the charging voltage into the
range the lithium battery likes (Jim and Heather brought that to my
attention). A diode on the 'C' terminal of the Ducati regulator is adequate
to fool the regulator into thinking the battery is at a slightly lower
voltage than it actually is and so it will up its charge voltage, placing
the battery into proper charging range. I think its 13.9 to 14.6 volts per
the data sheet, if memory serves.
This lithium battery has cell protection. It has internal circuitry that can
remove the battery from the circuit due to too low or too high voltages
(i.e. when it is overcharged or drained). A happily charged battery will
not disconnect from the airframe. It is wise to have a good metal battery
box for these in the unlikely event of a thermal fiasco. A thin Fiberfrax
layer can likely do wonders too.
The weight savings is amazing.. When you hold them in your hand, they feel
like a fake toy battery, but they will spin the engine right up for sure.
Greg
_____
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Paul McAllister
Sent: Friday, September 08, 2017 7:13 AM
Subject: Europa-List: Battery
Hi All,
My trusty Odessey battery has died and gone to heaven (or wherever batteries
go).
I am seeking peoples experience with the new style Lithium batteries, and in
particular what can be sourced in the US.
Thanks, Paul
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam
paign=sig-email&utm_content=emailclient> Image removed by sender.
Virus-free.
<http://www.avg.com/email-signature?utm_medium=email&utm_source=link&utm_cam
paign=sig-email&utm_content=emailclient> www.avg.com
|