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Relais/swtitch battery charger

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JPB View Drop Down
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    Posted: 27 July 2020 at 08:46
Dear all,

Does anybody know on which voltage the relais switches from charging the engine battery to charging the service battery when engine is running (not on shore power). 

Thanks!
Peter
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StavrosNZ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote StavrosNZ Quote  Post ReplyReply Direct Link To This Post Posted: 27 July 2020 at 10:18
I think you mean the voltage sensitive relay (VSR); typical disconnect voltage is 13.0 to 13.8v and connect voltage is typically 11.0 to 12.8v.

Some VSR’s are dual sensing so can be connected either way, some are single sensing so sensing post needs to go to engine battery.


Edited by StavrosNZ - 27 July 2020 at 10:25
Stephen
2010 H400 #691, Auckland, New Zealand
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Captain Cook View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Captain Cook Quote  Post ReplyReply Direct Link To This Post Posted: 27 July 2020 at 10:51
You can google the manual for the exact brand of your relay for further details, but the Calira Stromat "Ladestromsverteiler" which is fitted on my boat (the 50 (70A)model) switches the relay when the starter battery reaches 13,8V. At this point all battery banks will be charged.When the voltage drops below 13V,  the relay splits the battery banks again. These data are valid for Calira 120A as well.

On my boat the Hanse Yard had misplaced the cables, so the engine battery was connected to (I) on the Calira. It took me a while to discover this .
If you are connected to shorepower fairly often, this error may never be discovered.
It is very important that the engine battery (and the alternator/generator) is connected to (II) on the Calira, because (II) is the contact which closes the curcuit to (I) and (III) when the voltage reaches 13,8V.

I imagine, that it is clear, that when the alternator is connected to (I) or (III), only this single battery group will be charged, because (I) or (III) can NOT close the curcuit.

:Kjeld




Edited by Captain Cook - 28 July 2020 at 10:55
Freya Hanse400 #27 from 2006, 40HP Yanmar 3JH4E, Teak deck, 3-blade Flexofold, Aries LiftUp Windvane, Exturn 300, Jefa DD1,Simrad NX40,Icom M802(SSB)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JPB Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2020 at 10:41
thanks guys. 
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