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
"I would prefer a 7345 output stage that kept the voltage on it's output terminals very close to 13.8 volts with 45 amps flowing ... like some in this thread say that certain other RV power supplies will do."
Phil, you missed my earlier point.
What happens so far as I have seen, is that the charger is only at max VA for an instant. All during the time it is at constant amps, both battery and charger voltages are rising till converter voltage reaches the high set point where it trips over to letting amps taper.
It does not put out full amps while at full voltage except for that one instant at the top of the rise. EG Vector 40a trips at 13.9v so at that moment it is at 556w. Just before that it was at 40a and 13.8v = 552w. Just after that, voltage keeps rising but amps fall, so you see 14.1 and 38a say, =536w
I have seen on here that people like Salvo expect the charger to be at full VA right from the start and the theory is that the PD converter can't do that while the others can. I don't have a killawatt to measure the actual VA draw of the charger for the whole of Stage 1. I don't know how it keeps its own voltage ahead of rising batt voltage as shown in the ugly graph earlier. All I know how to do is multiply the output amps by the charger voltage, so that is where I get the max only for a moment at the top.
Phil, you missed my earlier point.
What happens so far as I have seen, is that the charger is only at max VA for an instant. All during the time it is at constant amps, both battery and charger voltages are rising till converter voltage reaches the high set point where it trips over to letting amps taper.
It does not put out full amps while at full voltage except for that one instant at the top of the rise. EG Vector 40a trips at 13.9v so at that moment it is at 556w. Just before that it was at 40a and 13.8v = 552w. Just after that, voltage keeps rising but amps fall, so you see 14.1 and 38a say, =536w
I have seen on here that people like Salvo expect the charger to be at full VA right from the start and the theory is that the PD converter can't do that while the others can. I don't have a killawatt to measure the actual VA draw of the charger for the whole of Stage 1. I don't know how it keeps its own voltage ahead of rising batt voltage as shown in the ugly graph earlier. All I know how to do is multiply the output amps by the charger voltage, so that is where I get the max only for a moment at the top.
