Tim(at)MyRV10.com
Guest
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 Posted: Sun Feb 26, 2006 5:56 am Post subject: Baclup Battery monitor - Aux batt charge |
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| Quote: | > The problem with diodes is they all have a forward volt drop, standard
> diodes are about 1 volt drop. So if your system charges at say 14.2
> volts, your second battery will only see 13.2V.
Which is a major issue for recharging the standby battery
to 100% of capacity.
> I believe the Shotkey (sp?) diode has a much lower drop...Althouigh I
> don't know what it is.
>
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I trimmed much of the thread for brevity on this single issue.
I'm now flying in my RV-10 with a schematic as shown here:
http://www.myrv10.com/N104CD/electrical/N104CD_Electrical_Schematic_Rev5.pdf
By using a couple of different diodes, (one was Eric's schottky),
I've now got a system with a couple of benefits:
* charges the aux battery through a schottky with a lower Vdrop at all
times.
* Powers the E-Bus from the Avionics bus, whenever the avionics bus is
on.
* Powers the E-Bus directly from the aux battery when E-Bus is on.
I use the E-Bus switch during startup to start the EFIS and EIS before
I crank the engine, and I get no Voltage drops rebooting my E-Bus items.
After engine start, I fire up the avioinics bus, and the rest of my
stuff comes online. I then shut OFF my E-Bus feed switch and if you
trace back the wiring, you'll see that I don't lose power during the
switch because of the diodes, and, I get the benefit of a diode-free
path from the alternator to the Aux battery. So, even though the
charging circuit is there with the schottky, I'll get the benefit
of getting 100% voltage to the aux battery for a full charge.
The rest of the system works great for me too. Some breakers,
some fuses. I do use a keyswitch with my Lightspeed and a Mag,
which works great, but I couldn't illustrate the switching of the
circuit using the keyswitch model, so I drew it as switches and it's
innacurate.
The Aux Alternator section is currently not installed. I'm waiting
for Plane-Power to come out with their aux alternator to save a bunch
of cost. It would be a nice thing to have, but actually with the
large set of aux batteries and the wiring that I have, it's nearing
overkill to add that to the system unless I plan not to land when
I have a problem.
Sorry to chop the thread. I've changed the subject line to accomodate.
Tim
Tim Olson - RV-10 N104CD - Flying
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