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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2227   
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All, I now have very accurate voltage measurement in my TD5 which I have noticed reports a charging voltage of 14.8v when the engine is first stated from cold. This voltage seems to drop back down to 14.3v when the engine has warmed up.
This voltage really is too high and risks damaging batteries through overcharging. I am interested to know what voltage other peoples TD5 alternators produce when started from cold. I have attached a poll to try and find out. Cheers, Steve 02' 110 TD5 Double Cab Rebuild Thread |
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17th Jan 2018 10:36am |
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| ericvv Member Since: 02 Jun 2011 Location: Near the Jet d'Eau Posts: 5816  
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I think 14.3V is right on the mark of what it should be. At least for the Puma, but don't know why it would be any different for a battery in a Td5.
Eric You never actually own a Defender. You merely look after it for the next generation. http://youtu.be/yVRlSsJwD0o https://youtu.be/vmPr3oTHndg https://www.youtube.com/watch?v=_GtzTT9Pdl0 https://www.youtube.com/watch?v=ABqKPz28e6A https://www.youtube.com/watch?v=rLZ49Jce_n0 https://www.youtube.com/watch?v=XvAsz_ilQYU https://www.youtube.com/watch?v=K8tMHiX9lSw https://m.youtube.com/watch?v=dxwjPuHIV7I https://vimeo.com/201482507 https://www.youtube.com/watch?v=ZSixqL0iyHw |
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17th Jan 2018 10:54am |
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| miker Member Since: 13 Sep 2015 Location: Surrey Posts: 1763 
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Up to 14.5V when really cold, gradually drops down to around 13.8-14.0
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17th Jan 2018 11:44am |
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| Mash Member Since: 09 Feb 2015 Location: Guernsey Posts: 1674  
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14.5-14.8 is about right, the 24v systems I work on often produce 28.8 volts to charge the batteries with no ill effects. 90 wolf - Jasmin http://www.defender2.net/forum/topic39408.html
90 V8 - Maggie http://www.defender2.net/forum/topic42564.html 110 TD5 - Buggsy http://www.defender2.net/forum/topic59029.html 52HG25 lightweight https://www.defender2.net/forum/topic72342.html D3 Hse - Fiona Capri 2l S - Anna Think I might have a problem............ |
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17th Jan 2018 1:01pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 622  
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It is standard, that alternator output voltage is temperature dependent - when really cold the voltage is higher, and drops, when the alternator temperature rises. The same is with batteries - in when cold they need higher charging voltage for proper fast recharge after starting engine. It is because the chemistry in battery is slower in lower temperatures, so it need more energy (higher voltage) for work.
This is not a problem for short time after engine start, but for long run it is not good. And one remark - "standard cheap board voltmeters" are all but nu quite accurate, and in high or low temperatures it is even worse. IT is good to check their accuracy with some high quality voltmeter/multimeter, just to be sure, that they work correctly. The same problem is with cheap multimeters. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo  |
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17th Jan 2018 1:58pm |
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| sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1218  
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Where's your reference for 14.8V is too high? It's precisely the right voltage for charging a typical lead acid battery in most situations.
Reference, Google lead acid battery charging, that and a masters project in it  Ed
82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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21st Jan 2018 6:02pm |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443  
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Mine can often be seen charging at 14.8V both on the Nanocom as well as the monitor directly wired to the battery posts, seeing as the battery is still the factory fitted one it hasn't done it any harm. Mine was built in January 2002
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21st Jan 2018 8:25pm |
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