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#31
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"To improve the quality of battery charging on BMW vehicles, the charging voltage on approved BMW chargers has been increased to 14.8 volts." |
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#32
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Explain. The charging rate is the amperage the charger is flowing to the battery.
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#33
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P.S. That charging quote you posted sounds quite off to me. "Battery charging must be performed using an approved battery charger (recommended charging unit: Deutronic DBL 430) at a constant voltage up to max. 14.8V." I though charging at a constant voltage went out years ago when smart chargers can into being. It is generally accepted in everything I have read that the bulk of the charging (up to 80% of full charge or thereabouts) should be done at constant current, and that only the last 20% should be done at constant voltage. Charging a highly-discharged battery using constant voltage sounds like a good way to fry a battery. Last edited by Penguin; 03-01-2010 at 03:29 PM. |
#34
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Not a translation problem as the document was written in perfect English and is a direct quote from a BMW document. I think you are confusing how a relatively simple $50 trickle charger works with a full size programmable charging system. If you've ever used a Deutronic system you'd know they are bulletproof, incredibly sophisticated and worth the $1000 retail price.
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#35
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However much it costs, words are words. And it makes no sense whatsoever to charge a battery using only a constant voltage mode. So obviously there must be something wrong with the words, as it is unthinkable that such an expensive and sophisticated charger would "charge at a constant voltage." P.S. I have an Electrical Engineering minor with my Mechanical Engineering degree, and have been working with electricity and electronics since I was 7 years old. So no, I am not confusing a trickle charger with a "full size programmable charging system." |
#36
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I guess it's not charger per se. It's device to keep voltage at solid 14.7 during programming.
P.S. Penguin, can you give me example of device that capable of doing what I need for programming? http://www.baumtools.com/pdf/Regulat..._DBL800_14.pdf |
#37
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Battery Chargers and Charging Methods
"Basic Charging Methods
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#38
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If you open link I posted above it states:
Regulated power supply AND charger. So, I guess I need "supply" portion of it. Can I get that cheaper then $925? Thanks! |
#39
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It appear the power supply in your link is designed with this in mind and is designed as both a battery charge and as a regulated power supply. It should work, assuming it can provide the required amperage (all regulated power supplies have a maximum amperage rating, beyond which they cannot maintain the voltage.) |
#40
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Placing a large R-C (resistance-Capacitance) across the power supply/charger terminals can remove power supply noise and provide a limited amount of voltage stability, but the problem with using that on a smart battery charger, rather than a regulated power supply, is that there is always the risk that a momentary increase in load would drop the voltage enough to put the charger back into the start of a constant current mode. The CTEK 7002 has a power supply mode which might work... but if I were to try that, I would probably do a little calculation and put a big capacitor and a resistor in series across the power supply terminals to provide some additional ripple suppression. Check-out the CTEK 7002 power supply mode specs and compare with the regulated power supply in the link you provided. P.S. I just checked the CTEK 7002 specs, and they say it has up to 4% ripple. This is unacceptable, IMHO, and it would take a rather large R-C to drop it enough, i.e., I wouldn't try it unless I had an O-scope to measure the actual ripple after adding the R-C network. P.P.S. I found this adjustable power supply for $200: Pyramid Regulated Power Supplies Unfortunately, they do not give ripple and voltage stability specs. But it might be worthwhile checking with them, to tell them what you'd like to use it for and get the specs and their opinion on suitability. Last edited by Penguin; 03-01-2010 at 04:20 PM. |
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