| Battery Isolators [message #281962] |
Sun, 12 July 2015 21:11  |
Jeff Marten
Messages: 199
Registered: August 2013
Karma: 1
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Senior Member |
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Not technically GMC-oriented, but is applicable. I installed a typical (i.e. old school) battery isolator in the jetboat. I'm getting ~13.5v in to the isolator, and only ~12.4v to each battery. I'm assuming the rest is lost as heat through the diodes. I just ordered a Battery Doctor/Wirthco isolator. Anyone using something similar to enable getting house and starting batteries to a full charge? At only 12.4v, the batteries will never reach full charge. I'm thinking about replacing the old school isolator in the Gulf Stream with one as well.
1985 Gulf Stream 34' Sun Stream
1964 Falcon 'Vert
1980 Bradley GTE
1999 Chevy Tahoe
2005 Saab 93 Aero
1987 Suzuki Intruder 1400
1978 Glastron/Carlson CV23
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| Re: [GMCnet] Battery Isolators [message #281963 is a reply to message #281962] |
Sun, 12 July 2015 21:21  |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
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Senior Member |
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I believe the "sense" wire for the alternator needs to "sense" the voltage output of the isolator. There is normally a .6 to .7 Volt drop across isolator diodes. I believe the voltage output of the alternator to the isolator input needs to be around 14.5 to 14.8 Volts.
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~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ Since 30 November '53 ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ Member GMCMI and Classics ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
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> Date: Sun, 12 Jul 2015 20:11:40 -0600
> To: gmclist@temp.gmcnet.org
> From: jtmarten@msn.com
> Subject: [GMCnet] Battery Isolators
>
> Not technically GMC-oriented, but is applicable. I installed a typical (i.e. old school) battery isolator in the jetboat. I'm getting ~13.5v in to
> the isolator, and only ~12.4v to each battery. I'm assuming the rest is lost as heat through the diodes. I just ordered a Battery Doctor/Wirthco
> isolator. Anyone using something similar to enable getting house and starting batteries to a full charge? At only 12.4v, the batteries will never
> reach full charge. I'm thinking about replacing the old school isolator in the Gulf Stream with one as well.
> --
> 1985 Gulf Stream 34' Sun Stream
> 1964 Falcon 'Vert
> 1980 Bradley GTE
> 1999 Chevy Tahoe
> 2005 Saab 93 Aero
> 1987 Suzuki Intruder 1400
> 1978 Glastron/Carlson CV23
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