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Mauledriver(at)nc.rr.com
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 Posted: Tue Sep 15, 2020 6:25 am Post subject: Installed new battery, Bus voltage went up over 15volts |
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I am running a Z-14 electrical system with dual batts/alts/buses. I
recently changed out an old Odyssey 680 for a new one after 4+ years of
service because it's fully charged, no load voltage fell to 12.5
volts. I swapped the battery positions as I put in the new one per my
normal procedure.
On the 2nd leg of the first flight after the swap I noticed that the bus
with the new battery was running slightly over 15 volts. Normally it
runs between 14.5 and 14.7. After some switching of avionics and other
components, I took it off line.
Is there any obvious reason a new battery would cause a bus to suddenly
run at a higher voltage when at cruise and presumably the power is being
supplied by an alternator and the voltage controlled by an B&C
regulator? 15 volts is too high a charging voltage for an Odyssey per
their user doc.
My inclination is to adjust the regulator but I don't recall having to
do this with past battery changes or swaps (the regulator is really hard
to access so there's that too).
Thoughts and opinions welcome.
Bill "everytime I get comfortable with a system something new pops up"
Watson
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user9253
Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan
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| Posted: Tue Sep 15, 2020 10:55 am Post subject: Re: Installed new battery, Bus voltage went up over 15volts |
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Make sure the voltage regulator has a good ground connection and that
the voltage sense terminal has the exact same voltage as the battery.
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