8x18650 power bank with adjustable dc out. Does not come with batteries. The construction looks cheap as hell, but I’m interested how would it fare in your tests.
Or would it be too similar to the 6x18650 Qidian you tested earlier?
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.