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
FWC wrote:
Something doesn't seem right with the DC-DC charger or the measurements. In all cases it calculates out to being about 65% efficient. That is terrible efficiency, and in that case it should have been getting hot as the charger would be dissipating about 135W of waste heat.
Agree on the watts in vs watts out which didn't come out as I expected. However, those were the numbers I got the way I got them. Measurements have some "internal consistency" so IMO they are ok. eg the way the engine battery voltage tapered with higher engine bay temps.
I carried on after the test and recharged the batts with the converter and the Tri was working right, and I compared Tri voltage with meter voltage and came out ok. Don't know what else could be skewing things.
Somebody else with a Renogy could try his numbers for a comparison. A guy in the other thread said his input amps draw was lower with fatter wire, but I did not see that at all. He has a clamp ammeter while I have an old time car dash type, but it showed 30 amps and wasn't stuck needled. Beats me.
