Renogy DC-DC Test Results-UPDATE 4 (Better!)
Updates 23 June--new test with Renogy input exposed for voltage readings Update 25 June more readings Update 4 - 27 June-- fewer amps with fat wire were noted this time! ----- I have the 20 ampe...
Forum Discussion
Might be this. I was not able to take the input voltage directly from the Renogy's terminals (no access to that end of the Renogy), but took that voltage outside the camper where I had the ammeter inserted. So that left a bit of 7-pin wire still from there to the Renogy and the ammeter.
So there could have been a voltage drop from the ammeter to the Renogy, making it still do 30 amps, but then how to explain the big improvement in output amps I got by using the fatter wire from the engine batt to the ammeter?
You use the total R on both paths in the circuit and each path can have sections of higher or lower R. It would reduce the R on that part of the path with the fatter wire as shown by the reduced voltage drop as seen on that part. Also when I did the neg path got even less drop by reducing total R even more.
Hard to believe that remaining bit of 7-pin and the 7-pin connectors could have so much R, but I have not measured that. I did get way better output amps though, so I am not convinced that was it, but can't prove anything with no measurement on that part of the pos path.
If the total R was still enough to make the Renogy pull 30 amps, how did it notice a higher input voltage so it then did its 19.x output amps?
So there could have been a voltage drop from the ammeter to the Renogy, making it still do 30 amps, but then how to explain the big improvement in output amps I got by using the fatter wire from the engine batt to the ammeter?
You use the total R on both paths in the circuit and each path can have sections of higher or lower R. It would reduce the R on that part of the path with the fatter wire as shown by the reduced voltage drop as seen on that part. Also when I did the neg path got even less drop by reducing total R even more.
Hard to believe that remaining bit of 7-pin and the 7-pin connectors could have so much R, but I have not measured that. I did get way better output amps though, so I am not convinced that was it, but can't prove anything with no measurement on that part of the pos path.
If the total R was still enough to make the Renogy pull 30 amps, how did it notice a higher input voltage so it then did its 19.x output amps?
