Normal Voltage values

dcarver · Nov 5, 2008

Hey guys,

I searched. Then searched some more.

I need help.

I recall Ionbeam had posted a chart of normal, or expected voltage values for a motorcycle charging system.

I currently have a DL650 in a shop for 'poor charging, e.g. 13.2 volts max' and they are telling me this is 'acceptable' and 'within range'. I recall Ionbeam saying with minimal load the voltage should be ~14.4 to 15.5 at road speed?

Anyway, if you search gurus could find that post or validate what I believe to be true I'd sure appreciate it.

Thanks In Advance,

Don

ionbeam · Nov 5, 2008

Wet cell (traditional battery) or gel cell? You could be ok at 13.2 volts. A standard wet cell battery would like to see 13.2- 13.4 volts for minimum charging voltage but not more than 15.6 volts.

LMK what your battery is and more info will follow

dcarver · Nov 5, 2008

ionbeam said:
Wet cell (traditional battery) or gel cell? You could be ok at 13.2 volts. A standard wet cell battery would like to see 13.2- 13.4 volts for minimum charging voltage but not more than 15.6 volts.
LMK what your battery is and more info will follow

Thank You Ionbeam! It's a sealed, e.g. 'maintenance free' lead acid, 10 Ah.

Model YTX12-BS. Per the factory service manual, output at 5k rpm should be 14.0 - 15.5 volts.

15.5 seems kind of high... I'd be more than happy to see 14.3 or above!

I recall you had generated a table of happy volts zone, kinda happy volts zone, not so happy and ruh oh!

Thanks again...

Don

Capt. Bob · Nov 5, 2008

dcarver said:
I recall Ionbeam had posted a chart of normal, or expected voltage values for a motorcycle charging system.
Don

Don,

This isn't the original post but it should link back. These are the values I use with my Datel. Clicky

dcarver · Nov 5, 2008

name='Capt. Bob' date='Nov 5 2008, 05:42 PM' post='513814']Don,

This isn't the original post but it should link back. These are the values I use with my Datel. Clicky

(ionbeam @ Apr 4 2008, 07:21 PM) Excerpted from a previous thread
With a good charging system, and a healthy, properly charged battery I would offer these guidelines for sustained voltages:

≤12.8 volts at the battery terminals – the charging system is over taxed, the battery is being discharged, and the stator is in danger of being permanently damaged.

12.8 to 13.2 volts – entering the danger zone, the battery is no longer being trickle charged and the stator is being taxed to the limits.

13.2 – 13.7 volts – sustainable, the stator is taxed but the battery is being charged.

13.7 to 14.5 volts – schweet

That's what I was looking for! Saved to the hard drive for posterity!..

Of course, Ion, if you care to elaborate, I'm all ears, kinda like SkooterG! :yahoo:

lnewlf · Nov 6, 2008

Datel seems to be the meter of choice so I'll put one on to keep an eye on my head to toe Gerbings liners. I fried two alternators on my FJ1200 [364 watts] with this outfit. Datel offers several meters- which part # would be the best one??

tx

Capt. Bob · Nov 6, 2008

lnewlf said:
Datel seems to be the meter of choice so I'll put one on to keep an eye on my head to toe Gerbings liners. I fried two alternators on my FJ1200 [364 watts] with this outfit. Datel offers several meters- which part # would be the best one??tx

I used: DMS-20PC-DCM Red Digit Meter. It's the LED model but I see it fine in sunlight. Clicky

They also make it in an LCD model for the "new wave types".

Good luck.

ionbeam · Nov 6, 2008

Capt. Bob said:
I used: DMS-20PC-DCM Red Digit Meter. It's the LED model but I see it fine in sunlight. Clicky
They also make it in an LCD model for the "new wave types".

Good luck.

The Datel two wire LED meters are plug 'n play and is the recommended way to go.

The LCD type needs to be selected with the back-light feature. Perhaps the real deal breaker for the LCD type is that they need a 5 VDC source to work, though the LCD would look OEM. If anyone has an interest in the LDC meter I can get them setup with a voltage interface.

I don't think we will be hearing from dcarver for a while, I just sent him a week long troubleshooting process :lol:

Auburn · Nov 6, 2008

What LCD display meter do you recommend? I have a 5 volt supply that I think I can adapt to feed the meter with.

ionbeam · Nov 6, 2008

AuburnFJR said:
What LCD display meter do you recommend? I have a 5 volt supply that I think I can adapt to feed the meter with.

Datel has a two wire LCD meter without a backlight, this would install just like the LED model. This meter would be fine by day but unusable at night.

Datel also offers two different size LCD meters with backlighting, there is the small meter and the larger meter. Both these meters require a 5 VDC supply and some jumpers between the pins to fix the location of the decimal point. I would suggest that you consider a bezel kit for these meters.

You could power the backlight meter using a three pin LM7805 regulator but the regulator would probably draw more current than the LCD meter! You shouldn't use resistors as a voltage divider because the motorcycle voltage varies from 12.6 to 14.7 volts and the resistors would be unregulated.

Normal Voltage values

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