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02-11-2016, 10:18 AM | #1 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,546
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Lithium batteries, overcharging and fire.
Ok, I know there have been many discussions on the subject of lithium batteries.
I've been tempted by the light weight and small size and so, despite still having some uncertainty, I bit the bullet and have fitted Magneti Marelli Li.Fe PO4 batteries to both the monster (M750) and my 650 Dommie. I remain somewhat nervous though, mainly about the prospect of them bursting into flames. And then today, on the "other" forum, someone posted a pic of a burnt out KTM. I have no details but a lithium battery was in the mix. The other day I noticed that it says on the case of my batteries that the charge rate should not exceed 15V. Now, that might not be a problem if your reg/rec is working correctly but we all know that these units are unreliable .. indeed mine has previously malfunctioned, boiled a lead/acid battery and burnt out the multiconnector to the alternator. My new reg/rec is hard wired, but I'm still not totally confident that the system is failsafe. And 15V doesn't sound like much of a safety margin. In my earlier considerations of lithium batteries, it was pointed out that the newer Ducatis such as the Panigale are fitted with Lithium batteries from new. However, I have no idea whether the charging circuit has been modified to suit, or if it is the same basic design as mine. And therein lies my question. In a similar vein, I find myself wondering if it is possible to fit a voltage limiting device which would operate in much the same way as a fuse does to limit current ? This would not be a second voltage regulator, but a failsafe limiter which would "blow" in the event of exceeding the charge voltage, or have some other mode of operation to ensure 100% that high voltage charging was impossible. You'll have to excuse my relative ignorance of electrickery here, I'm afraid. As a secondary issue, I'm wondering if there would be any advantage in wiring the headlamp to be on all the time, to soak up some of the excess. I have heard suggestions of it being wired directly from the battery in these cases, but that's all I know. I can't help wondering if this has something to do with the circuitry on the Pani etc. So, I confess my ignorance and humbly enquire of the forum experts. I thank you. |
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