Hi, 

so I have an 8kw sunsynk inverter and 3 x 5.12kw sslb1 sunsynk batteries. I have 16 470watt Jinko solar panels. 8 on 1 mppt and 8 on the other. System has been running flawlessly since august last year.

 

recently I have been having a problem where one of my batteries ( middle one) beeps.. after checking out the manual and forums and googling I think it’s an over voltage alarm.. because when I start to discharge the batteries the beeping stops.

the inverter gives me no warming signals or faults. All my charge voltages are set on the inverter as specked from the manual. 
 

does anyone know of a solution? 
 

I actually don’t want to charge my batteries to 100% anyway but I can’t figure out how to do it because it charges to 100% regardless of the mode it’s set on the inverter. 

Hi Derek,
i just got my sunsynk 8kw last month.
only 2 x 5.1kw batteries.
Sorry for the noob question but why not charge it to 100%?
I'm still playing with the percentages to get it to not charge the batteries too much during the night after loadshedding so that theres plenty of capacity for the panels to get it to 100 the next day. I don't want to do something that will take years off the batteries life, i'm no pro on this so i'm open to advice.
with stage 6 i've changed the SOC % to 80% as the 4H loadshedding multiple times a day is a bit much.
our municipality will be punished soon with extra loadshedding due to non payment to eskom so i might have to get a 3rd battery

 

Hi, @Loman I’m also no expert but I have watched a few videos on how much strain the cells take once they have passed 90%… so because my system is oversized at the moment my whole house runs off the batteries from 5pm at night and at 7am in the morning my batteries are only at 75%…

so for one I don’t need all that capacity so if I can take some strain off the batteries by charging it to 90 or 95% then possibly it will prolong the lifespan and maybe sort out my overcharge alarm. 
 

Even if I change my inverter in the mode setting to charge to 90% , with the panels during the day it still charges to 100% and then trickle charges through the day. I was thinking I need to change the charge voltages in my battery settings but I’m not sure what’s the best settings or if that’s even the right thing to do.

 

bottom line is I need to sort out my beeping alarm and only charge the batteries to 90%… I also read it could be a firmware issue but have not clue if I can update the firmware of the batteries. 

Edited January 12, 20232 yr by Derek Ramos

hope you get that sorted

23 hours ago, Derek Ramos said:

Hi, @Loman I’m also no expert but I have watched a few videos on how much strain the cells take once they have passed 90%… so because my system is oversized at the moment my whole house runs off the batteries from 5pm at night and at 7am in the morning my batteries are only at 75%…

so for one I don’t need all that capacity so if I can take some strain off the batteries by charging it to 90 or 95% then possibly it will prolong the lifespan and maybe sort out my overcharge alarm. 
 

Even if I change my inverter in the mode setting to charge to 90% , with the panels during the day it still charges to 100% and then trickle charges through the day. I was thinking I need to change the charge voltages in my battery settings but I’m not sure what’s the best settings or if that’s even the right thing to do.

 

bottom line is I need to sort out my beeping alarm and only charge the batteries to 90%… I also read it could be a firmware issue but have not clue if I can update the firmware of the batteries. 

Are the batteries communicating with the inverter using CAN or RS485?

If it is then this will override any charge settings you put into the inverter, these settings will be ignored.

As long as you don't exceed 3.65v per cell your battery will be fine and you can expect many years of use out of it.

The only way to achieve wat you want is to turn off the battery / inverter communication and use voltage settings to try and charge to lower voltages, but beware that it is virtually impossible to estimate SOC using voltage settings, so you might think you are charging to 90%SOC while you are actually only hitting 80%SOC.

It only one battery is giving you an alarm I would think that it is an issue with that battery as opposed to the inverter, charging circuit, wires and connections etc.

Can you see what the BMS is reporting using PBMS tools ? This will be the only way to self diagnose wat is happening.

 

 

12 minutes ago, I84RiS said:

Are the batteries communicating with the inverter using CAN or RS485?

Hi @I84RiS

its using CAN

13 minutes ago, I84RiS said:

If it is then this will override any charge settings you put into the inverter, these settings will be ignored.

Okay that makes a lot of sense..

 

14 minutes ago, I84RiS said:

The only way to achieve wat you want is to turn off the battery / inverter communication and use voltage settings to try and charge to lower voltages, but beware that it is virtually impossible to estimate SOC using voltage settings, so you might think you are charging to 90%SOC while you are actually only hitting 80%SOC.

Thanks I don’t think I’ll be doing this

 

15 minutes ago, I84RiS said:

Can you see what the BMS is reporting using PBMS tools ? This will be the only way to self diagnose wat is happening.

I haven’t tried to do this and I don’t know how to do this… but I’m going to do some research on it. 
 

thank you for your reply.. was very helpful 

I read something on the sunsynk forum where multiple people have this issue, apparently I need to get someone to come and upgrade the firmware and also there is a setting that makes the battery beep when it’s fully charged that needs to be taken off.. kind of makes sense because when the SOC changes to 99% the beeping goes away, and it’s the same for multiple uses…somehow I don’t think it’s a battery issue but a firmware and settings issue.. I will keep this post updated incase anyone has the same issue

1 hour ago, Derek Ramos said:

Hi @I84RiS

its using CAN

Okay that makes a lot of sense..

 

Thanks I don’t think I’ll be doing this

 

I haven’t tried to do this and I don’t know how to do this… but I’m going to do some research on it. 
 

thank you for your reply.. was very helpful 

I read something on the sunsynk forum where multiple people have this issue, apparently I need to get someone to come and upgrade the firmware and also there is a setting that makes the battery beep when it’s fully charged that needs to be taken off.. kind of makes sense because when the SOC changes to 99% the beeping goes away, and it’s the same for multiple uses…somehow I don’t think it’s a battery issue but a firmware and settings issue.. I will keep this post updated incase anyone has the same issue

To use PMBS tools is easy, you can download the software (a few battery manufacturers and resellers list it on their websites). You also need a Battery to USB cable. I am not familiar with the Synsynk batteries, so can't help with the exact cable you need. I am sure someone on this forum will know. It is a very handy tool, even if you don't have issues it is very useful.

I tend to agree with you, it is likely a firmware issue that should be solved with an upgrade to the latest available firmware (I have seen this before on a different battery, there a firmware upgrade fixed it). 

On 2023/01/13 at 8:29 PM, I84RiS said:

To use PMBS tools is easy, you can download the software (a few battery manufacturers and resellers list it on their websites). You also need a Battery to USB cable. I am not familiar with the Synsynk batteries, so can't help with the exact cable you need. I am sure someone on this forum will know. It is a very handy tool, even if you don't have issues it is very useful.

I tend to agree with you, it is likely a firmware issue that should be solved with an upgrade to the latest available firmware (I have seen this before on a different battery, there a firmware upgrade fixed it). 

Thank you so much, I haven’t had time to get on this yet but I will do it soon. Thank you for your help.

You probably have unbalanced cells in that battery. I'm not sure what kind of balancer the SS bms's use but you can try keep the batteries at 100% SOC for 24 hrs and see if that helps. (not easy with current load shedding) 

On 2023/01/13 at 6:46 PM, I84RiS said:

The only way to achieve wat you want is to turn off the battery / inverter communication and use voltage settings to try and charge to lower voltages, but beware that it is virtually impossible to estimate SOC using voltage settings, so you might think you are charging to 90%SOC while you are actually only hitting 80%SOC.

Hi @I84RiS,

Is there anything wrong only charging to 80%SOC?

I understand you will have less capacity, but will this dammage the cells in any way compared to 90%SOC?

Clive.

Edited June 13, 20231 yr by Clive