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
Hard to say what value the "efficiency" has, and whether that or how much of that is internal to the DC-DC.
If the object is to get full constant amps out and keep the draw on the input low enough to not over-task the alternator, then all you need to know is how much is too much for the alternator.
If you can meet that spec with 80% efficiency, why go to 90%? How much gas do you save while driving the truck for a few hours by having 90% vs 80%?
Comparing efficiency using watts as in above posts, with just using amps is sort of interesting. EG, in my fat wire test it was 78% at best, but 20/24 (if 24 is valid!) using amps is 83%.
The 91% above was with 24/28 amps = 86% So if the purpose of the exercise is about the amps then using watts might be less useful as an indicator. Too many factors in motion all at the same time!
It does seem like you can over-do it beyond what you need to meet the objective though. Do the easy stuff first and see if you are already there before doing the hard parts.
If the object is to get full constant amps out and keep the draw on the input low enough to not over-task the alternator, then all you need to know is how much is too much for the alternator.
If you can meet that spec with 80% efficiency, why go to 90%? How much gas do you save while driving the truck for a few hours by having 90% vs 80%?
Comparing efficiency using watts as in above posts, with just using amps is sort of interesting. EG, in my fat wire test it was 78% at best, but 20/24 (if 24 is valid!) using amps is 83%.
The 91% above was with 24/28 amps = 86% So if the purpose of the exercise is about the amps then using watts might be less useful as an indicator. Too many factors in motion all at the same time!
It does seem like you can over-do it beyond what you need to meet the objective though. Do the easy stuff first and see if you are already there before doing the hard parts.
