BFL wrote:
I get about 90a draw by an inverter running a 1000w kettle or toaster.
"If the unit is drawing about 1000w it fits the watts spec. But those watts spec figures are suspect IMO. Eg the 1440 for the 100amper is way different from the previous spec of 1600 something , which made more sense. Also divide the watts by the 108 voltage and you don't get the amps listed either.
Another clue as to converter amps size is the set of reverse polarity fuses on it. EG a typical 55amper would have two 30a DC fuses. My 100amper PM3 has four 40a fuses. So I think a 75amper would have something in between.
Another possible clue is the size of the thermistor. The bigger converters have more of a thermistor. It is that black disc on two legs just in from where the 120v cord goes onto the circuit board near the 120a glass fuse. What is written on that thermistor? " (end)
Man, there you go reading my mind again! Freaky!!! Just yesterday I was looking around at the components, wondering if the numbers on them could help me identify what this thing really is? lol.
Yes, 9a does seem low. And the pm4-pfc you just linked to is said to be 93% efficient, while the pm4b is rated at 85%. So, at 16.5v max and 75a max, and 85% eff, using 120v as the denominator, that indeed works out to 12a, not 9.
I need to do another check once my clamp meter arrives to be sure. For all I know, the 1000w / 8a(recommended) inverter may have been freaking out a little, and perhaps limiting power to the charger? Or, perhaps I didn't hold the test charge long enough for the amps to rise all the way?
It appears I am somewhat reluctantly becoming the Sherlock Holmes of pm charger dysfunction... and I guess that makes you my trusty chinese sidekick, Watts-son. :) Or maybe it's the other way round? lol.
I will get back with whatever I find component wise.
xiè xiè ni de bang zhù
