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Posted: Wed Jun 23, 2010 9:29pm

Post Subject: split charger

Hi,could you please tell me what voltage drop I should expect through a split charging diode?.Our sterling power unit shows more over 1volt less at the out terminals than at the in terminal.Is this normal? Trevor


Posted: Thu Jun 24, 2010 8:19am

Post Subject: split charger

Dear Trevor, no, it is not normal but then it all depends upon where the Sterling Power unit is taking it's measurements. The normally quoted voltdrop across an ordinary split charge diode is between 0.6 & 0.7 volt. You see unless there has been some "easy fitting" I can see no benefit in measuring the voltages at either side of the diode. The important thing is the voltdrop across the WHOLE charging circuit and I can believe that anyone who fits a split charge diode would have insufficient understanding of the theory to also cause voltdrop on the wiring. My advice is to ignore the Sterling device and use a good quality multimeter set to volts. Take one reading across the diode and then another between the bank positive and the alternator output. Do it with the engine revving and first thing in the morning with flattish batteries. Repeat for the other battery bank. Then you will see where the voltdrop is. If you want to send me the readings and I may be able to advise on how to improve it. On charging circuits 0.1 volt is significant so you are trying to achieve less than 0.3 volt at maximum alternator output. Tony Brooks

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