Battery with higher amperage than the alternator. Is it worth it? - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 02-23-2013, 03:11 AM Thread Starter
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Battery with higher amperage than the alternator. Is it worth it?

Dear All:

I believe this applies to any car not just mine, so I post it here in the general division. Sorry if it is the wrong decision.
- Smart Guy 12:54

I was wondering if it is worth it to use a battery with more amperage than what the alternator is rated. Right now I'm using a 80Ah battery, simply because the previous one was like so and the car was happy with it, so lets use this as an example.

Not sure how the electricity charging goes with cars, so my question is, are the extra 10 amps from the battery wasted?

No electrical problems except a very little dimming in instrumental panel's light and the A/C ventilation losses very little air pressure at idle. That with the head unit working. I notice this if I concentrate.

My plans are to add a second horn and possibly replace the mechanical fan with electrical.

Any thoughts? And thank you in advance.

Current vehicles:
1-MB W124 300e 12v 1992 +425k Km (daily drive)
2-Ford Crown Victoria 2009 (used when needed).

Previous vehicles:
Ford Crown Victoria 2001 (sold in early 2009)
MB W124 200 1986 (sold in late 2005)
MB W126 500 1986 (sold in late 2004)
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post #2 of 6 (permalink) Old 02-23-2013, 09:20 AM
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The extra amps mean that the battery will last slightly longer when the alternator is off. You're confusing amps with volts. A lower amperage alternator will take slightly longer to charge the battery. If you draw more than 70 amps the alternator won't keep up with the discharge rate and the battery will start to die. But you won't be pulling anywhere near 70 amps.
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post #3 of 6 (permalink) Old 02-23-2013, 11:17 AM
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Ah is capacity, while amps are the output.
It is like comparing gas can size to outlet hole that limits the pouring.
If you can't understand the difference, don't worry - putting slightly bigger battery will not affect the car work (as long as it fits in the compartment) while not having snow, you'd be OK with slightly smaller battery as well.
That if you use the car as design and not using it for running 2000 W stereo.
Your voltage drop on idle is weak alternator and no battery size is going to change that.
Have your alternator tested, maybe you have dead diode?

Last edited by Kajtek1; 02-23-2013 at 02:06 PM.
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post #4 of 6 (permalink) Old 02-23-2013, 02:29 PM Thread Starter
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Then it was a misunderstanding; confusing amps with volts and the capacity with the out put. Thank you for clarifying.

I'm planning to replace the mechanical engine fan with another w124 double aux. fan. Will the current 70A alternator, in a good condition, be enough to take care of old aux. double fan and the extra one replacing the mechanical fan? And both at full load? Every thing else is factory spec. except for the head unit only.

I'll check the alternator first of course.

Current vehicles:
1-MB W124 300e 12v 1992 +425k Km (daily drive)
2-Ford Crown Victoria 2009 (used when needed).

Previous vehicles:
Ford Crown Victoria 2001 (sold in early 2009)
MB W124 200 1986 (sold in late 2005)
MB W126 500 1986 (sold in late 2004)
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post #5 of 6 (permalink) Old 02-23-2013, 06:32 PM
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I know Saudi Arabia is pretty hot country, while electrical fans pump less air than mechanical ones, so the small alternator might be the last worry when your temperature gauge will go into red.
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post #6 of 6 (permalink) Old 02-23-2013, 10:53 PM Thread Starter
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I was thinking maybe less cooling but better consistent airflow and temp. at lower RPM's for the electrical even though it is gonna give hotter lower end coolant temp.

But, point taken.

Winter is ending now.

Current vehicles:
1-MB W124 300e 12v 1992 +425k Km (daily drive)
2-Ford Crown Victoria 2009 (used when needed).

Previous vehicles:
Ford Crown Victoria 2001 (sold in early 2009)
MB W124 200 1986 (sold in late 2005)
MB W126 500 1986 (sold in late 2004)
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