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Date: Sun, 17 Feb 2013 21:14:25 -0500
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Subject: Re: [LML] Re: strobe light power draw
From: Charles Brown <browncc1@verizon.net>
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Main bus is fed by both alternators and the battery; no isolation.  I =
know that Regulator 2 is too high (28V at the moment), and I'm going to =
adjust it; but it wasn't doing that when I bought it; neither was the =
original Regulator 2; so I'm also looking for a common factor that seems =
to have made two successive Regulator 2 units start kicking in when they =
shouldn't. =20

OK, two votes say the Whelens probably have a cyclical draw; if anyone =
knows different or has any hard data, please squawk.  What I've observed =
is Alt 1 amps going up and down 3-4 amps, and I guess that's normal.  =
Thanks guys.  -- CB

On Feb 17, 2013, at 5:03 PM, Colyn Case wrote:

Charley,

I haven't examined the Whelen strobe controller but it wouldn't surprise =
me if it had more draw right after the flash.  =20

What is the setup between alt 1 and alt 2?   Do you have them both =
feeding the same bus?  If so, maybe increasing the spread (e.g. make alt =
2 .2 V lower than alt 1) will keep #2 from cycling on and off all the =
time.    (I have a 2 bus system and run some items off of alt 2 and =
others off of alt 1 with critical systems fed by both through diodes.   =
The diodes mean I have a soft failover if alt 1 fails but the spread =
means that alt 1 carries the load normally for those items that are fed =
from both sides.   The separate busses mean I find out as soon as it =
happens if alt 2 is weak...and then I can go to cross feed).

Colyn