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
BFL13 wrote:
Input voltage was 10.42, now it is 11.28v. No change in output no way to know the draw (assumed still 30 amps)
this is the main issue here, your making assumptions. untill you have a way to measure input and putput voltages and currents at the same time you will never be able to get a factual and defendable result.
it only stands to reason if your output current and voltage stays the same but you raise you input current by almost one volt that your input current is going to reduce.
power in = power out + losses is a standard and your losses should be remaining the same or what we can consider the same if your output isnt changing.
the problem is to do it properly you would need shunts that have external power and two voltage meters not triametrics that use powr themselves and are "close"
I also expect like other that the ground set up is playing a roll, the manual specifies a 6ga wire for the positive and ground wires min, for your run it probably should follow the 4ga recomendation from your truck battery to the charger depending where the batteries are.
Steve
