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Old 20 September 2012, 07:36   #11
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So two 975cca/75ah Optimas would be good then? Only thing is that it suggests an alternator voltage of 13.8-15V, but ours outputs 55V..
that'll explain you replacing all your electronics then.
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Old 20 September 2012, 08:00   #12
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Originally Posted by gotchiguy
So two 975cca/75ah Optimas would be good then? Only thing is that it suggests an alternator voltage of 13.8-15V, but ours outputs 55V..
Careful Olly, engage brain before triping
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Old 20 September 2012, 08:12   #13
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I'd sort your charging problems before replacing your batteries....
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Old 20 September 2012, 08:59   #14
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that'll explain you replacing all your electronics then.
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Careful Olly, engage brain before triping
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I'd sort your charging problems before replacing your batteries....
Hmm....

Well the facts are as follows:

With the engine off the battery voltage is normal, 11.5-13.5ish. When the engine is switched on, even at idle then the voltage reading is always 55V. Now, I have absolutely no idea where the icommands are taking this reading from, it can't possibly be from the power supply they are receiving otherwise they would have blown up..

And certainly all the electronics only ever receive 12v because thanks to our myriad problems I have had to test them many times...

The wiring was done awfully when built but we are keen to get it right this time and do it properly. Should there be a voltage regulator between the engine an the battery then? Or am I missing something?

Battery taken out was a badly sulphated 700cca 100ah, condition not yet been tested
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Old 20 September 2012, 09:01   #15
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I'd sort your charging problems before replacing your batteries....
In fairness to Gotchi, the Etec alternator does output 55v, this is used internally by the engine for the EMM& Ignition circuits. It's then chopped up , smoothed& regulated to 13.8v for external battery charging etc.
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Old 20 September 2012, 09:41   #16
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In fairness to Gotchi, the Etec alternator does output 55v, this is used internally by the engine for the EMM& Ignition circuits. It's then chopped up , smoothed& regulated to 13.8v for external battery charging etc.
So is it the engine instruments that are reading 55v?
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Old 20 September 2012, 10:04   #17
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Do you know that your batteries were actually sulphated? If so, they could possibly have been saved (or part rejuvenated). Sulphation and its causes are complicated, but lack of use and bad charging can cause it. AGM batteries are more robust than SFL lead acids and I think can tolerate abuse a bit more from bad charging. However, I doubt they'd be a problem for your Etec to handle.
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Old 20 September 2012, 11:06   #18
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Quote:
So is it the engine instruments that are reading 55v?
Sort of, he has icommand guages that can be configured to read allsorts of data and Gotchi has his set to read the alternator voltage, which as Pickey says in an Etec is 55v. What he needs to do is tab through the gauge setup to find Battery Voltage this will then show the normal battery charging voltage.
Gotchi if you really want to make use of the Etec battery charging features you can fit the Auxillary charging lead and charge 2 battery banks independantly. No VSr's, relays or diodes.

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Old 20 September 2012, 11:07   #19
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So is it the engine instruments that are reading 55v?
I think what is happening is the i-commands are set to read "alternator" voltage which is 55v, this is a NMEA2000 sentence from the EMM, not a true voltage reading as such. Change this to "Battery" & it should read sensible numbers. If all else fails stick a voltmeter across the battery terminal on the solenoid & earth.
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Old 20 September 2012, 11:08   #20
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Sort of, he has icommand guages that can be configured to read allsorts of data and Gotchi has his set to read the alternator voltage, which as Pickey says in an Etec is 55v. What he needs to do is tab through the gauge setup to find Battery Voltage this will then show the normal battery charging voltage.
Gotchi if you really want to make use of the Etec battery charging features you can fit the Auxillary charging lead and charge 2 battery banks independantly. No VSr's, relays or diodes.

Keith
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