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  #1  
Old 10-11-2010, 10:28 AM
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Default Having trouble keeping voltage set..

Hey

Installed my vcm not too long ago, pretty convenient. At first I used it on a 12v battery, just something while i was waiting on my xs d1400 to come in.

It was pretty solid with the 12v battery. On some days if it were cold out, the voltage would be very high, once at 15.2 at least. i want to say it was a little higher, (which i didn't think as possible because of the cap, but i could be wrong)

So id usually ahve to immediately set it lower.

When i got my d1400, i dropped it in right away, no major problems so far. my HID lighting works fine, amps are very noticeably louder lol. But as far as voltage goes, i feel i am ALWAYS adjusting it. This morning when i cranked it up, it was at 17.2. As always i set it lower asap. But it doesn't seem very consistant. sometimes ill set it at 16.4 - 16.6 and it seems to drop sometimes, or go up others. but im adjusting pretty often.. normal?

thanks

ps - the one thing that isn't working right is my stinger volt meter. It blinks and wont read about 16.5. it just blinks when i start to get over 16.0, then just says "H I" after 16.5. is there a switch for that?

and ive never let it get about 16.8. i checked and double checked so i dont mess this battery up.
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Old 10-11-2010, 05:35 PM
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Quote:
Originally Posted by reclessantics View Post
Hey

Installed my vcm not too long ago, pretty convenient. At first I used it on a 12v battery, just something while i was waiting on my xs d1400 to come in.

It was pretty solid with the 12v battery. On some days if it were cold out, the voltage would be very high, once at 15.2 at least. i want to say it was a little higher, (which i didn't think as possible because of the cap, but i could be wrong)

So id usually ahve to immediately set it lower.

When i got my d1400, i dropped it in right away, no major problems so far. my HID lighting works fine, amps are very noticeably louder lol. But as far as voltage goes, i feel i am ALWAYS adjusting it. This morning when i cranked it up, it was at 17.2. As always i set it lower asap. But it doesn't seem very consistant. sometimes ill set it at 16.4 - 16.6 and it seems to drop sometimes, or go up others. but im adjusting pretty often.. normal?

thanks

ps - the one thing that isn't working right is my stinger volt meter. It blinks and wont read about 16.5. it just blinks when i start to get over 16.0, then just says "H I" after 16.5. is there a switch for that?

and ive never let it get about 16.8. i checked and double checked so i dont mess this battery up.
The voltage from an alt will fluctuate depending on temperature and load. If the alt is cold, it will produce more voltage... if it is hot, it will throttle back it's voltage. Part of the reason for this fluctuation is to help protect the battery. When a battery is cool, it is OK to charge at a higher voltage (near 15v for a 12v batt), but when the battery warms up, the voltage needs to be cut back some to help keep the battery from over-heating. If a sealed AGM style batter gets too hot, it can warp, or swell the plastic case as the internal pressure builds. For this reason, it is important to keep a close eye on the output voltage of your alts when you are using external regulation.

The voltage will also fluctuate from load. As you drive and the battery gets topped off, the voltage will stabilize wherever you set the voltage to if you are not playing the system. Once you start pounding on the system, and pull more current than the alt can produce, the voltage will drop because you are exceeding what the alt can produce. At this point, if you adjust the voltage up to try and compensate, you will simply be raising the top end set point, and once your batteries get topped back off, the voltage will stop wherever you set the voltage. I would recommend setting the voltage at a safe level when the alt is hot and your batteries are fully charged, and use that as your reference point. Then only adjust the VCM to fine tune adjust your voltage, and resist dialing it up when your pounding on the system. By dialing the voltage higher and higher while your pounding on the system, you are not increasing the output of the alternator, you are simply raising the regulator upper threshold setting.

Hopefully I didn't ramble on too long that it got confusing... if so, just give us a call and we can help clarify if needed.
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Old 10-11-2010, 08:28 PM
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no that made sense, thanks so much.

yeah I usually set it onces im driving steady, if i needed to get it adjusted.

Not sure the best voltage to charge the d1400... when its over 16.1 ish the volt meter flickers bad (its off, only turns on when i turn the H/U on.. will change later though) and when its under 16.0 volts, the little "stinger" image/ word aboves the numbers flicks on and off. (the numbers dont come on, just the little image above it) but there isn't a problem when its under 16.

so i just set the vcm to 15.8/9 ish. is that ok? i get almost no voltage drop at full tilt, even at night, no dimming what so ever.

thanks
kyle
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Old 10-11-2010, 08:29 PM
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also, i need the i-bar, which one would work with this battery? the i-bar 555 is what i was looking at/ what would work the best for what i need.

thanks
kyle
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Old 10-13-2010, 04:40 PM
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The Stinger voltage display is probably not made to handle over 16.0v. I wouldn't worry about that too much. Ideally, you should charge at 16.5-16.8, but 16.1 is fine as long as it is getting a full charge to your batteries. The best way to tell is to check the voltage at the batt after they have been sitting for 24hrs. If they are fully charged and nothing is draining them, they should rest at 15.1-15.2v.

If you have a lot of connections to make, I would suggest the 555 I-BAR kit.
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Old 10-13-2010, 08:11 PM
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say i do set it at like 16.5-16.8, i know when i start up in the morning, the vcm will chare at probably well over 17. how bad is that for the battery, considering 16.9 is the cap?
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Old 10-14-2010, 09:16 AM
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That isn't a problem. Stock alternators will also charge high when they are cold. On a 12V system they usually charge in the 15.2+ voltage at start up. When the batteries are cold this is fine.
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Old 10-14-2010, 02:30 PM
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k nice that was what i was worried asbout lol
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Old 10-14-2010, 02:31 PM
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Actually stinger is pretty accurate up to 17.9v There is a dial on the back.
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Old 10-14-2010, 03:46 PM
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yeah i was curious if there was a switch, ill check
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