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
With 11.x input voltage compared with truck battery voltage of near 14, that shows a considerable amperage flow on that circuit. When I had the ammeter in there it said it was 30 amps, but of course I can't say what it is without the ammeter in there Still a big voltage drop, so got to be lots of amps, ammeter or not.
I don't have to defend anything since I did make clear the input watts situation did not come out as expected, and I don't know why.
You can install yours and see what you get. The owner's manual says input amps will be 50% more than output amps at max amps, so expect 60 when yours is doing 40. It does say the unit will "perform better" with less voltage drop on the input side. It does not say that better performance will mean fewer amps.
There is also heat. The unit's fan comes on. Some watts are involved there. FWC mentioned a possible current limit for input, but AFAIK that should be applied to the truck battery end not the receiving end at the Renogy --not too clear on that.
A lesson learned was to by-pass the 7-pin connectors for both pos and neg. Those connectors work for the signal lights but sure have high R for the 12v charging wire pins. If we still had the 5er, I would look at that even with no Renogy involved, where 7-pin charging is so lame.
I don't have to defend anything since I did make clear the input watts situation did not come out as expected, and I don't know why.
You can install yours and see what you get. The owner's manual says input amps will be 50% more than output amps at max amps, so expect 60 when yours is doing 40. It does say the unit will "perform better" with less voltage drop on the input side. It does not say that better performance will mean fewer amps.
There is also heat. The unit's fan comes on. Some watts are involved there. FWC mentioned a possible current limit for input, but AFAIK that should be applied to the truck battery end not the receiving end at the Renogy --not too clear on that.
A lesson learned was to by-pass the 7-pin connectors for both pos and neg. Those connectors work for the signal lights but sure have high R for the 12v charging wire pins. If we still had the 5er, I would look at that even with no Renogy involved, where 7-pin charging is so lame.
