Skip to first unread message
Dacian Todea
Dec 12, 2020, 1:59:40 PM12/12/20
to electrodacus
Can you send a photo of the battery and connections ? The diagram looks OK maybe the real connections are wrong.
I seen some people with those popula blue LiFePO4 cells confused positive and negative terminals. For some reason the black terminal is positive and the light grey/white is the negative.
All SBMS0 are tested before shipping.
Mojobuslife
Dec 12, 2020, 2:54:03 PM12/12/20
to electrodacus
The LFP currently has 13.2V. Positive and neagtive are labeled.
Photos do not go better have only 20cm space above the LFP.
Dacian Todea
Dec 13, 2020, 2:57:36 AM12/13/20
to electrodacus
You mentioned a black LCD only and based on your photo that is not true. The SBMS0 is powered and there is one line of text on the LCD.
Your problem is that SBMS0 was in a very humid environment and water condensed on the main PCB and the water prevents the real time clock oscillator form starting thus it is stuck to the first line.
You will need to keep the SBMS in a warm and dry place for a day or so or open the SBMS0 and heat the 32.768kHz real time crystal with a soldering iron that way problem is fixed in a few minutes instead of a day or two in a warm and dry place.
Mojobuslife
Dec 13, 2020, 8:40:49 AM12/13/20
to electrodacus
i started it again this morning and sbms0 load and works.
then i connect this 2 shunt https://de.aliexpress.com/item/4000064162901.html
in 200A and 500A 100mV
200A PV shunt displays zero
500A Battery shunt display ~9 - 10A this is about my permanent load
can i adjust the shunts with values if yes where
Dacian Todea
Dec 13, 2020, 1:31:00 PM12/13/20
to electrodacus
Pay attention to the shunt sense wire polarity. The PVp will be on the side of the shunt where it is connected to solar PVn is on the side where it connects to Battery shunt. And for battery shunt ADC1p is where it connects to battery+ and the ADC1n is where it connects to PV shunt and Load.
The go to ADC menu on the SBMS and there set resistance value for the shunts 0.1V/200A = 0.5000mOhm and for the battery shunt 0.1V/500A = 0.2000mOhm then current shunts values will be correct.
Also SBMS0 needs to be able to turn off all charge sources and separately all loads. If it can do that then current shunt zero offset calibration that is done at power up will be done correctly as during boot the SBMS0 will have the charge sources and Loads OFF and thus zero current will flow through both shunts and so it will consider that as zero value.
Dacian Todea
Dec 13, 2020, 1:33:50 PM12/13/20
to electrodacus
Also forgot to mention that after you set the correct current shunt values you should go to Device settings and push the Save Device Setting button to permanently save the current shunt values else after a power cycle they will not be stored.
Message has been deleted
Patrik K
Mar 1, 2021, 5:40:59 AM3/1/21
to electrodacus
@Dacian,
Yesterday I was up to my cabin and were supposed to start up the system again.
In January, after 2 months of no sun, I brought my 8S LiFePo4 batterypack back home, as it was very low on charge.
Hence, my SBMS0 has not been up and running for 7 weeks and as the cottage has no heating, the SBMS0 showed the "humidity error" and couldn't be persuaded to boot up.
Now it is at home in a dry environment and I plan to install it in the coming weekend.
Is there any way to start the SBMS0 without attaching it to the battery (with the multiconnector), i.e. can I just connect 2 of the pins to a 12V battery to get it to boot up?
What I am trying to achieve here is a way to check that it is fully dry and will work when I get back to the cabin.
Regards
Patrik
Dacian Todea
Mar 1, 2021, 2:33:15 PM3/1/21
to electrodacus
Patrik,
You can connect pin 1 to negative and pin 12 (red wire) to positive of any supply 6V or higher and then the SBMS0 will boot up but of course there will be errors as there are no cells connected. But you will be able to see that it boots up.
Maybe have the SBMS0 installed in a sealed case if condensation is a problem at your location.
Patrik K
Mar 2, 2021, 5:29:14 AM3/2/21
to electrodacus
Sorry for being a bit daft ;-)
I didn't bring the connector/cable home with me.
Which contact is 1 and which is 12?
I took a photo for reference.
First I assumed that top left was 1 and bottom right was 12 (in analogy with the 16 pin connector), then I looked at photos with the connector in place and it looks like it is the other way around...??
// Patrik
Dacian Todea
Mar 2, 2021, 11:38:12 AM3/2/21
to electrodacus
Patrik,
No is the other way around. You can use pin 11 or 12 one of the two closest to the other 10pin black connector for positive and then pin 1 or even 2 for negative (those closest to bottom of the photo). The numbering system may not make sense as I needed to keep compatibility with other SBMS versions in the past. I assumed you had the cable as that will have been the easiest way to connect.
Reply all
Reply to author
Forward
0 new messages