PD Converters and Water Usage

BFL13 wrote:
Where do you measure the 'converter voltage' with the converter wired to the battery? I can't with mine. I can measure at the converter's output terminals, but the voltage there is affected by the battery's voltage.

The wire joining the battery and converter would have the same voltage at each end if there were no voltage drop due to current flowing. Before the converter's 120v is turned on, you see battery voltage 12.x at the converter.

Turn on the 120v to the converter and boom, you get 13.x at the battery and something higher at the converter. You won't see 14.4 at the converter until the battery has come up very close to that.

So howinheck can you measure the converter's starting voltage at 14.2-14.4 with the batteries connected? Where do you put the meter on it?

The converter voltage is the voltage at the output terminals. Ideally you would expect to see the output voltage be at 14.4V or whatever unless limited by current, in which case the current would be 45A or 60A or whatever and the output voltage whatever voltage that corresponds to. (The claim is that the PD converters often are at neither the full output voltage nor the full output current, but fail to put forth their rated power at the "boost" setting. I have not run any specific experiments on mine in this regard; with luck this weekend I'll be able to finish wiring up a proper battery voltmeter and ammeter and finish up some other electrical upgrades I'm making, and then be able to do perform experiments in my "copious free time.")

The converter voltage and the battery voltage indeed differ only by the wiring voltage drop, which should be directly proportional to the charging current, assuming of course no significant other 12V loads than the battery being charged. If you determine the resistance of the wiring, it would in theory be possible to measure any two of the three measurements (current, battery voltage, and converter output voltage) and compute the third.