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Phil White
Joined: 10 Jan 2006
Posts: 45
Location: Downers Grove, IL
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 Posted: Sun Jun 06, 2010 7:38 pm Post subject: voltage regulator level change? |
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I have purchased 2 Ford 166 regulators to provide external regulation
(and OV protection capabilities) for the 2 alternators in my
electrically dependent plane.
As I am using AGM batteries, I understand they prefer a higher
charging voltage than standard lead-acid types. Can one readily modify
the Ford regulators to provide the 14.5 V output level? Or, is there an
external circuit that I can insert between the alternator and regulator
(a voltage divider) that would accomplish this?
Phil in IL
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nuckolls.bob(at)aeroelect
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| Posted: Mon Jun 07, 2010 5:49 am Post subject: voltage regulator level change? |
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At 10:37 PM 6/6/2010, you wrote:
| Quote: |
I have purchased 2 Ford 166 regulators to provide external
regulation (and OV protection capabilities) for the 2 alternators in
my electrically dependent plane.
As I am using AGM batteries, I understand they prefer a higher
charging voltage than standard lead-acid types. Can one readily
modify the Ford regulators to provide the 14.5 V output level? Or,
is there an external circuit that I can insert between the
alternator and regulator (a voltage divider) that would accomplish this?
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There is quite a lot of no-value-added-worry-fodder
circulated by well meaning but ill informed individuals
who parrot "common knowledge" and tid-bits gleaned
from a host of data sources. One example can be found
at:
http://www.aeroelectric.com/articles/Alternators/Know_Your_Charging_System.pdf
The Big Picture experience and study of simple-ideas for
lead-acid battery technology demonstrates that the service
life of the battery in your airplane is MOST influenced by
how you use and maintain it . . . and LEAST influenced by the
alternator regulator's set-point.
There's a large body of information you may cruise
by going to my website at:
http://aeroelectric.com
and use the home page search engine to locate
articles referring to "charging voltage". While
you'll find several "preferred" charging voltage
set-points cited for various products, nobody
strays very far from the legacy lead-acid charging
set-point of 14.2 volts. Many an SVLA battery
has been STC'd onto type certificated aircraft
as a DIRECT REPLACEMENT for the flooded battery
product that the airplane was certified with.
None of those STCs call for re-adjusting
the alternator regulator.
The short answer is that there's no advantage to
be gained for modifying your regulators. The
SVLA/RG/AGM batteries will live quite happily in
your airplane at the stock VR166 operating set point.
Bob . . .
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