parallax power supply 7345ru parts PWM
My 7345 is not charging the coach batteries but does supply 12power to all accessories. The transformer, fan and relays work fine. Think i need a PWM circuit for it. Contacted PP tec support and th...
Forum Discussion
Using the converter without the diode is like driving without seat belts on. How lucky do you feel? You'll probably see smoke if the sense wire opens and the diode isn't there.
This mod compensates for the positive cable voltage drop between the converter and battery. The converter may have a resistance of 8 mohm and your cable may have 10 mohm, for a total of 18 mohm. At 45A, you'll get a voltage drop of:
IR_drop = 18 mohm * 45A = 0.81V
In order to get 13.8V at the battery, you need 14.61V at the converter. It's been a long time since I've done this mod, but I think the diode will only raise the voltage 0.5V, however you really need 0.81V. You could try putting two diodes in series.
Sal
This mod compensates for the positive cable voltage drop between the converter and battery. The converter may have a resistance of 8 mohm and your cable may have 10 mohm, for a total of 18 mohm. At 45A, you'll get a voltage drop of:
IR_drop = 18 mohm * 45A = 0.81V
In order to get 13.8V at the battery, you need 14.61V at the converter. It's been a long time since I've done this mod, but I think the diode will only raise the voltage 0.5V, however you really need 0.81V. You could try putting two diodes in series.
Sal
