Fred, I would go along with the notion hat a single
Odyssey battery ( or any modern equivalent - but not a
conventional lead acid battery) is sufficient. It Has
worked well for me for 12 years. Never needs charging.
Starts first time in mid winter after being ignored for 3
months. I do not see the need for doubling up. Once had a
rectifier failure in the North Sea with perhaps 50 nm to
go to land, but it was not an issue. Got all the way back
to Gloucester without any drama! The engine carries on
(even my 914 which has its electric fuel pump driven
directly from the alternator and carries on in spite of
rectifier failure or indeed if you switch off both master
and alternator switches) and you don't absolutely need
any other form of electricity, although the battery has
ample reserves to run a radio and a GPS (if it doesn't
have it's own internal battery) for several hours. It is
possible to imagine some really complex form of failure
that could bring another battery into use, but I have
never heard of anyone having such a failure, and the
weight of an extra battery + wiring is a heavy penalty to
pay. Build light & fly further!
Regards, David Joyce, G- XSDJ
"kees de bussy" <keesdebussy@hotmail.com> wrote:
><keesdebussy@hotmail.com>
>
>Fred,
>
> I have an Odyssey 545 mounted on the rightside footwell.
>The 545 is a little smaller than the 680, has somewhat
>less cranking power and saves about 1.3 kg over a 680.
>Although its smaller capacity it cranks and cranks and
>cranks my 912s for years, even in freezing cold wheather.
>
>For what it is worth.
>
> Kees de Bussy
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=409646#409646
>
>
>
>
>
>
>
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