[engolling]

Can you post a picture of your setup, then I will try to show you what probably is happenig and how we can validate it by measuring with the multimeter.
If it is the case I'm expecting I can show you how to solve it.

I can also explain it on my setup but it looks a bit different because I have the XL6009 with voltmeter.

Regards,
Stefan

[laulau]

Can you post a picture of your setup, then I will try to show you what probably is happenig and how we can validate it by measuring with the multimeter.
If it is the case I'm expecting I can show you how to solve it.

I can also explain it on my setup but it looks a bit different because I have the XL6009 with voltmeter.

Regards,
Stefan

Hi,
I've installed a XL6009 with voltmeter since a few days.
   

[engolling]

Could you power up the system on the input with no load on the output attached and make the 6 voltage measurements described in the picture.
I also see that there are also some other XL6009 with display than the one I use

[laulau]

Could you power up the system on the input with no load on the output attached and make the 6 voltage measurements described in the picture.
I also see that there are also some other XL6009 with display than the one I use

I do not see the measurement point N ° 4 

1 B+B-  > 8.35V
2 Vin-Vin+ > 8.35V
3 Vout-Vout+ > 12.06
4??
5 B+Bm > 4.21V
6 BmB- > 4.13

[engolling]

Could you power up the system on the input with no load on the output attached and make the 6 voltage measurements described in the picture.
I also see that there are also some other XL6009 with display than the one I use

I do not see the measurement point N ° 4 

1 B+B-  > 8.35V
2 Vin-Vin+ > 8.35V
3 Vout-Vout+ > 12.06
4??
5 B+Bm > 4.21V
6 BmB- > 4.13

The 4th point was to check if you are reading carefully   ... no I just messed it up because I can not count until 4 .

All of the values are fine.

If I understood you right - everything works but if you are on battery it stops within one hour and switches off unti you supply it again.
Could you let it run on battery and do the 5 measurements about each 15minutes.
Maybe one of the cells is bad.

Regards,
Stefan

[werk_ag]

Sorry to step in...
Laurent, are you sure you did this important step, as described by Stefan:

With no load, measure the input voltage (not assuming the rated voltage of the power supply), and adjust the XL6009 output voltage to be lower 0.3 or 0.4V than input voltage?

After assembled, I forgot this step and just adjust the output voltage, forgetting that it should be lower than input voltage. This has caused strange behaviours, including high heating of the inductance on the charger module.

After what I read on the topic, and to prevent the risk of damage the devices connected to output, I added a second XL6009 to the output of the UPS (I know, loss of efficiency).
What I have:

Input: 9.1V
Output: 8.0V (set on the XL6009 installed on the board)
Second XL6009 Output: 5.0V (powering my test 4Pro DUE RX at workbench)

Its being working perfectly, not tried yet run it until full discharge of batteries. Maximum time I tried it without power in was 4 hours.

[laulau]

HI,
I have 12.1V with the PSU connected and 11.8V without (no load at the output)
B+B- 8.2V
10min later 7.7V 7.7 11.8 3.9 3.8
5min later 7.3 7.3 11.8 3.8 3.6
5min later 6.8 6.8 11.8 3.7 2.9  and it shut down 

[engolling]

Look at your cell voltages:

Cell 1: 4,2 --> 3,9 --> 3,8 --> 3,7V
Cell 2: 4,2 --> 3,8 --> 3,6 --> 2,9V

The protection board shuts down due to undervoltage.

Those cells are totally crappy.

[engolling]

Good morning to all,

I updated the first page of the thread with schematics and so on to build the v1.3 since it is pretty simple and can be done without any PCB.

It works fine as it is when using proper batteries and devices.
I think it is rather a fault / design problem of the small XL6009 module so it can not regulate its output properly if there is not a defined input voltage.
Regards

[laulau]

Look at your cell voltages:

Cell 1: 4,2 --> 3,9 --> 3,8 --> 3,7V
Cell 2: 4,2 --> 3,8 --> 3,6 --> 2,9V

The protection board shuts down due to undervoltage.

Those cells are totally crappy.

 Hi,
I've installed a new set of lithium cells and all is working fine for 3 hours now
Those Chineese low cost battery are really unreliable (to be polite)