I know you have quite an impressive equipment for testing color rendering, but I do not remember if you have an oscilloscope... Maybe yes, I recall some rigor stuff,too lazy now.... Sorry...
I was curious about the Vripple, on load, V drop etc...
I put in 4x Panasonic NCR18650B and 4x LG F1L after I tested that they had pretty much identical internal resistance and capacity. The power bank is configured in 4S4P and I inserted one Panasonic and one LG to each parallel pair so at least every series component was as close to identical as possible with this mixed set.
After successfully charging a Macbook Pro at 30-60 watts for about an hour and output about 41Wh (measured with a PortaPow), I tested the voltages of the individual cells as:
1S
1P 3.755 V (F1L)
2P 3.755 V (18650B)
2S
3.751 V
3.752 V
3S
3.753 V
3.753 V
4S
3.752 V
3.752 V
Cells properly connected in parallel auto-balance automatically. In fact, you can combine different cells in each parallel array successfully:
The smaller cells are 10+C rated vs the 50As at 4C. This means the smaller cells will only provide 10 - 12% of the torque during a long sustained load, but provide more than 25% extra cold start torque, which is quite good for a low gear ratio drill mostly used to behead bolts (LoL!).
There’s two USB ports on the thing. For reference, on the Omnicharge (similar adjustable power bank) I measured 126 mVp-p and 22 mVrms from its USB ports at 1A. On the QD188 USB1-port I got 310/90 mV, USB2-port was ridiculously bad at 1800/410 mV (yep, that’s 1.8 volts peak to peak). Not much difference between 1 and 2 amp load.
I don’t have a very good cable setup for measuring ripple from the dc out, but at 12V/1A the QD188 was about the same as the Omnicharge at 356 mVp-p and 106 mVrms.
edit: disclaimer, the batteries on the QD188 were almost empty when I did the test
edit2: was able to bring down the noise a bit on the QD188 USB2 (1800mV to 800 mV) by using a different usb power bank to power the ZL1100 load. Should probably use a resistor instead to eliminate all other possible source of noise.
or (the link below contains link to the item’s software download and manual; the software is still ‘beta’ or more likely ‘alpha’ stage; I tried downloading and running the software [without having the USB power meter] and the software is a mix of English and Chinese, on my English Windows 10)
[update: seems like there is a Power-Z KM001 and a Power-Z FL001; the Power-Z FL001 looks like a clone of the ZY1276; but YZXStudio seems to start to announce a new smaller sized ZY1275 that looks to be a clone of the Power-Z KM001 —- these are just my guesses based on the scant info (for now) I’ve seen while browsing around]
- or - (the description of the link below has more detailed references; the feedback section of the link above has an English translation of
the features comparison table)
For Power / Energy logging, I had a VoltCraft Energy Logger 3500 for a few years now, I wonder how it compares with the ZhuRui PR10 Power Recorder. But it seems the VoltCraft Energy Logger is not being sold anymore…
Thanks, I will be looking on some of these meters.
Now I also needs a real usb-c power supply with 20V 5A, anybody have a good idea where I can find one.
With power/energy meters I prefer to test currents ones, I have publishes a test of one more and I have one more in queue.
That is not what I am looking for. I has to be a USB Type-C charger with 100W, not a Quick charger or docking station (That delivers power on some other connector).
It do not need to, but for testing it would be nice to cover the full usb-c power range. I nothing better shows up I will probably start with the Apple.