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12-08-2010, 07:26 PM
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Join Date: Nov 2009
Location: RI, MA
Posts: 38
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How much voltage is too much?
I just installed a new (Mark Landoll) alternator. It is putting out 14.7 or 14.8 the info that Odyssey (PC 680) says keep it under 15v but am I too close doing any damage?:
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Steven Goldin KTAN ( south of Boston) 
RV 12
RV6-A sold
VAF 2464
401-338-9747
sgoldin1@gmail.com
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12-08-2010, 08:03 PM
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Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,351
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220 or even 120v would be too much  but I think you are OK with 14.7 only keep an eye on it. Also how are you checking your voltage and does it remain the same voltage with various RPM? Some regulatros are adjustable.
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Mehrdad
N825SM RV7A - IO360M1B - SOLD
N825MS RV14A - IO390 - Flying
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Last edited by Bavafa : 12-08-2010 at 08:05 PM.
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12-08-2010, 08:10 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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I'd be ok with that, are you measuring with an accurate digital voltmeter?
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
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RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
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12-08-2010, 08:49 PM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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Quote:
Originally Posted by Walt
I'd be ok with that, are you measuring with an accurate digital voltmeter?
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And at the battery.......
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12-08-2010, 08:51 PM
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Join Date: Jan 2007
Location: Stuart, FL /Hartford, CT/Virgin Gorda,BVI
Posts: 3,122
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steve, i think you can tweek that external regulator with the adjusting screw.
hows the wx in the north?
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RV6-A 5,200+ hrs, R-44 1,600 hrs, Helicycle 320 hrs, gyro sold,35,000 miles flown in 2015 
Stuart, Fl / S WINDSOR,Ct / Virgin Gorda, BVI - under major repair from hurricane damage
VAF #840 EAA AOPA FAC FABA QB SPA
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12-08-2010, 11:46 PM
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Join Date: Dec 2006
Location: Arroyo Grande, CA
Posts: 938
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I've found that if you go over 14.2V at the battery that you will use more water if it's that kind of battery. The regulator I designed and built holds the voltage to 14.0V. If you have a temperature probe connected to the battery case feeding a regulator that compensates for battery temperature then it will provide the proper voltage but that kind is seldom seen.
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12-09-2010, 09:07 AM
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Join Date: Nov 2009
Location: RI, MA
Posts: 38
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thanks info
The regulator is internal so no adjust, the monitor is EIS from Grand Rapids, the voltage does not change with RPM very steady. So I guess I will leave for now.
Thanks
Steve
__________________
Steven Goldin KTAN ( south of Boston) 
RV 12
RV6-A sold
VAF 2464
401-338-9747
sgoldin1@gmail.com
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12-09-2010, 05:09 PM
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Join Date: Aug 2005
Location: OKC, OK
Posts: 687
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Over voltage protection
Back in the mid-90's a friend of mine had a Landoll alternator on his RV6. The built in regulator failed and the voltage went high, uncontrolled. No telling how high the voltage got, but it fried quite a lot of things in his panel instantly.
I'd suggest putting in some kind of over voltage protection, unless the newer Landoll alternators/regulators have that incorporated these days. Cheap insurance...
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12-10-2010, 10:22 AM
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Join Date: Nov 2009
Location: RI, MA
Posts: 38
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OVP
ordered from perihelion design OVP anyone ever use one?
__________________
Steven Goldin KTAN ( south of Boston) 
RV 12
RV6-A sold
VAF 2464
401-338-9747
sgoldin1@gmail.com
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12-10-2010, 03:40 PM
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Join Date: Nov 2006
Location: Lewistown
Posts: 161
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pc 680 paper work
if i remember correctly in the pc 680 paper work they give voltages for charge. and if I remember correctly 14.8 is perfect, anything less is less than 100% charge. My odyssey battery charger charges at 14.8.
Noel
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