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02-22-2017, 04:37 PM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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Battery Overcharging in Flight
I went up this afternoon for a while and got a battery voltage warning of 14.5-14.6 volts. I cycled the alternator regulator off and back on, and it went right back to the same indication. I have a (wait for it....) PlanePower alternator. Should I just bite the bullet and order a B&C alternator and regulator now and avoid what appears to be inevitable problems? Or is there something I can do to resolve this?
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RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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02-22-2017, 04:58 PM
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Join Date: Oct 2005
Posts: 704
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Have you verified that the voltage reading is correct?
Rob Hickman
N402RH RV-10
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02-22-2017, 05:16 PM
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Join Date: Nov 2013
Location: Prescott, AZ
Posts: 1,613
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What kind of battery? My 680 runs that voltage all day long...
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"Kindness is never a bad plan."
exemption option waived. Donation appropriate.
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02-22-2017, 05:33 PM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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I shoulda done more research. It's a PC-680 and from what I read after I posted (see? don't do that) apparently it likes up to 14.7 volts, so I'll just watch it and see if I see any significant fluctuation. I just had an old mindset from the old flooded cell batteries. Thanks! 
__________________
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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02-22-2017, 05:34 PM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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Quote:
Originally Posted by N402RH
Have you verified that the voltage reading is correct?
Rob Hickman
N402RH RV-10
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No. I'm just getting the reading from the VP-X into my Skyview.
__________________
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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02-22-2017, 06:06 PM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,092
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Probably OK
What flightlogic said. My B&C (same as a 680, I think) requires 14.6 +/- 0.2V.
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(2020 dues paid)
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02-22-2017, 06:43 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,767
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As others said, an Odyesse battery should be fine. But if you're concerned, double check the alternator field line for any voltage drops. The PP uses that as the sense line, and its internal regulator will up the output if there are drops on that line.
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02-22-2017, 08:19 PM
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Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,187
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Maybe you should sell that PP alternator to me real cheap and buy a B&C so you can sleep better? :-) Larry
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Larry
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02-23-2017, 08:42 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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Quote:
Originally Posted by LARCO
Maybe you should sell that PP alternator to me real cheap and buy a B&C so you can sleep better? :-) Larry
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When it fails for real, I'll let you know! 
__________________
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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02-23-2017, 08:45 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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Quote:
Originally Posted by BobTurner
As others said, an Odyesse battery should be fine. But if you're concerned, double check the alternator field line for any voltage drops. The PP uses that as the sense line, and its internal regulator will up the output if there are drops on that line.
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I'm no electrical guru, so this question will probably be stupid, but if the battery was a few years old and was beginning to have problems holding a charge, would this possibly be manifested with this level of charging current? The battery is a three years old plus or minus, but had not flown until late last November and it's been sitting in the hangar without being used for a couple of months due to the bad weather and wind.
__________________
RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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