High voltage

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: High voltage

For an unregulated charging system, as you have ie just a rectifier, the battery acts as the regulator. Only true quality lead acid deep cycle marine batteries will perform this task adequately. Maintainance free or gel batteries don't make the cut. Even some "deep cycle" are of poor quality. You want a battery with thick plates (interstate makes a superb battery). A poor lead acid deep cycle marine battery has thin plates and consequently this plates can shift. And the result is that your battery acts like "BAD" ground. This is most likely where your overcharging problem lies.<br /><br />So the solution is: spend the extra money on some good batteries or hook up a voltage regulator.<br /><br />If not....<br />There is short somewhere. The stators can't put out that much voltage, if so you have a solved a problem engineers in that industry have been trying to solve for years.<br /><br />You should be able to run all day without electrical acessories running, and not overcharge your battery.
 

dafox99

Petty Officer 1st Class
Joined
Jul 8, 2005
Messages
203
Re: High voltage

Yikes .. andy .. so that system doesn't even have a regulator?
 

duke3

Petty Officer 2nd Class
Joined
Jun 30, 2005
Messages
108
Re: High voltage

All gronds have been found OK. Also ground at the rectifier. The charging coils resistance is the same as in the manual. I can read 16V AC at idle speed at the rectifier-wirers from the charging coils. Also I can read 16V AC at the tach (grey wirer for pulse signal) to ground at the battery.<br />Resistance from ground at battery, to any ground at the motor, is less than 0,5 ohm.<br />The DC volt Im reading at the battery, hase been reading with my voltmeter-gauge, and my digital-voltmeter (same result !).<br />And the new 80 amp.battery is a battery from a new VW Passat diesel car, and cost 135 US$.
 

andy6374

Lieutenant Commander
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Aug 4, 2005
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1,617
Re: High voltage

Sure $135 is alot and I wasn't criticizing by any means. I ran into this problem before and finally ended up talking to the engineers who design the stator. And they told me of this battery "issue". I ended installing a regulator, but I recently got an interstate deep cycle marine battery and unattached the regulator and the system doesn't overcharge.<br /><br />They said explictly that car batteries won't work, neither will maintainance free batteries. They were right.
 

dafox99

Petty Officer 1st Class
Joined
Jul 8, 2005
Messages
203
Re: High voltage

Makes sense. If there is no regulator, the only things determining battery voltage is the resistance in the stator winding, the current/voltage out of the stator, the voltage drop across the rectifier, and the voltage and internal resistance of the battery. It looks like you've eliminated everything but the battery characteristics?
 

duke3

Petty Officer 2nd Class
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Jun 30, 2005
Messages
108
Re: High voltage

Well Andy6374.<br />Wrong battery seems to be my problem !!<br />But how high DC-voltage could you read at the battery, before you did install regulator and an interstate deep cycle marine battery ???<br />Also what AC-voltage could you read before your rectifier. ???
 

andy6374

Lieutenant Commander
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Aug 4, 2005
Messages
1,617
Re: High voltage

The high voltage problem was eliminated with either the voltage regulator or the good battery. I ended getting the battery because I wanted to see if the engineers were correct, but the regulator alone works just fine. I wasn't aware that all deep cycle marine batteries, weren't "true" lead acid deep cycle marine batteries.<br /><br />Before the battery or regulator I was getting 18-19 volts at WOT and 16-17 at idle speeds.
 

duke3

Petty Officer 2nd Class
Joined
Jun 30, 2005
Messages
108
Re: High voltage

Well andy6374.<br /><br />18-19 volts at WOT and 16-17 at idle speeds was also what I could read before I installed the new battery.<br />What can you read today at your interstate deep cycle marine battery without any voltageregulator. ?
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: High voltage

At WOT it never exceeds 15V. All depends on how charged the battery is. If it is fully charged you will see higher voltages.
 

andy6374

Lieutenant Commander
Joined
Aug 4, 2005
Messages
1,617
Re: High voltage

But, with the regulator it never exceeds 14.2 volts
 
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