Jonathan,
I have been using a Varley Redtop 25 racing battery which is 16AH AGM
(absorbed glass matt). This is virtually identical spec to the Odyssey
PC680 which many people use for a Rotax 912S. It has provided perfect
starting for 6 years. The battery is behind the baggage bay and uses 4
gauge battery cables. I have never seen more than 14.2 volts system voltage
and on a fully charged battery it is mostly at 13.8 volts.
Provided you have good connections and big enough cable, I don't think you
will have any problems with a new Rotax 912S, even with the older starter,
as long as the sprag clutch is in good condition.
Regards
Brian Davies
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of jonathanmilbank
Sent: 10 October 2013 14:40
Subject: Europa-List: Re: Battery questions
--> <jdmilbank@yahoo.co.uk>
My situation: this winter I'm upgrading from Rotax 912UL to 912S 100hp, but
keeping the installation in the Classic engine bearer and retaining the
original cowlings and firewall forward as far as possible. Therefore I MUST
keep the old shorter starter motor.
For C of G reasons, the battery must be mounted in the rear fuselage behind
the old (smaller) baggage bay and therefore the battery must be very safe
and immune from risks of overheating. At the moment I have a simple ride-on
lawnmower lead-acid battery, which might not have enough "oomph" to start
the higher compression S engine.
What I'm hoping you can tell me is which is the most common battery used in
UK LAA Permit Europas and referring to a friend's quote "I can't remember
what the system voltage is with the engine running, but the odysseys need
14.1 to 14.7v to ensure avoidance of both sulphation and overcharging",
should I be installing a different rectifier/regulator?
My 912UL engine only produces a maximum of 14.2 volts. Maybe I can manage
with the ride-on lawnmower battery, but I doubt it.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=410213#410213
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