Hi Powerforum team

I have a yet to be completed install, where i only have my inverter and batteries currently operational, but no panels.

Consists of an 8kw Sunsynk inverter, and a stack of 4 Pylontech US3000C batteries.

Solarman app reports only a 50% charge after a few days of AC charging, although the LED's on the batteries indicates otherwise.

Is there possibly a wrong configuration here, or maybe a firmware incompatibility?

If there is any other screens required, please let me know

 

thx guys!

 

regards

 

 

Edited July 30, 20214 yr by ErwinK

19 minutes ago, ErwinK said:

Hi Powerforum team

I have a yet to be completed install, where i only have my inverter and batteries currently operational, but no panels.

Consists of an 8kw Sunsynk inverter, and a stack of 4 Pylontech US3000C batteries.

Solarman app reports only a 50% charge after a few days of AC charging, although the LED's on the batteries indicates otherwise.

Is there possibly a wrong configuration here, or maybe a firmware incompatibility?

If there is any other screens required, please let me know

 

thx guys!

 

regards

 

 

I have the same inverter and 4 pylontech us3000 batteries. 

My screens below. 

Did you balance the batteries for connecting them to the inverter? 

More 

6 minutes ago, Achmat said:

I have the same inverter and 4 pylontech us3000 batteries. 

My screens below. 

Did you balance the batteries for connecting them to the inverter? 

Thank you. that looks more or less what i thought it is supposed to be . about 145a charge for 0.5C, and capacity double that.

installed by installer, thus i don't know w.r.t balancing . Does that not occur automatically due to BMS?

busy discharging them tonight with a simulated power failure to see if that might correct the situation, but i think updating the settings is a next step.

 

think it is currently on a 20% safe value for DOD. want to first confirm matching firmware before pushing to 10%.

 

 

24 minutes ago, ErwinK said:

Thank you. that looks more or less what i thought it is supposed to be . about 145a charge for 0.5C, and capacity double that.

installed by installer, thus i don't know w.r.t balancing . Does that not occur automatically due to BMS?

busy discharging them tonight with a simulated power failure to see if that might correct the situation, but i think updating the settings is a next step.

 

think it is currently on a 20% safe value for DOD. want to first confirm matching firmware before pushing to 10%.

 

 

What you can do is to connect them one at a time to the inverter and charge each one individually. Then disconnect them and connect them together to let them balance which should take a few minutes. You can then connect them all together to inverter again. 

Or you can use this method in the video below.

 

Edited July 30, 20214 yr by Achmat

2 hours ago, Achmat said:

What you can do is to connect them one at a time to the inverter and charge each one individually. Then disconnect them and connect them together to let them balance which should take a few minutes. You can then connect them all together to inverter again. 

Or you can use this method in the video below.

 

ok will give it a try . power test gave an estimated 3kwh in 3 hours and then switched off. doesn't corelate settings 100% i believe, but will try balancing and updating settings. 
thx for inputs so far

An update on this -> Tested system capacityon friday night, whihc came short by about 8 hours.

updated settings as per Achmat's screenshots above on Saturday, but then notice batteries was not receiving charge. (Also gave the battery stack a full power cycle, just to be certain they ar epicking up the master correctly.

Enabled Grid Charge option under Batter settings -> Charge, and immediately saw power going to batteries. -> Odd part is i am relatively certain the batteries charged the first time after installation earlier this week

after getting a a full charge, tested a pwoer failure again last night, and managed 12 hours from 8pm to 8am , using about 55% of SOC, which matches my planned values roughly.

Not sure what the "Grid signal" option is under charge settings,  but didn't seem to initiate charging in my current setup.

Happy for now however, as i really hope to have solar panels installed in the next month or two, once the Body Corporate gets the neccesary permission for me to perform installation on the unit's roof. with solar installed, charge settings from grid will be disabled as i would prefer this to occur from solar only.

 

thank you for the guidance Achmat!

 

On 2021/07/30 at 7:48 PM, ErwinK said:

Hi Powerforum team

I have a yet to be completed install, where i only have my inverter and batteries currently operational, but no panels.

Consists of an 8kw Sunsynk inverter, and a stack of 4 Pylontech US3000C batteries.

Solarman app reports only a 50% charge after a few days of AC charging, although the LED's on the batteries indicates otherwise.

Is there possibly a wrong configuration here, or maybe a firmware incompatibility?

If there is any other screens required, please let me know

 

thx guys!

 

regards

 

 

Hello

Just click 'Batt Capacity' window with the cursor and increase the cumulative capacity of the 4x batteries by means of the control buttons on the panel.  Do the same for the different amperages as per the settings in the installation manual or the batteries.  You can control the other settings Batt Charge and Shut Down tabs in a similar way.

Regards

I and many others have Sunsynk 8K with Pylontech over charging the Batt

Mine is overcharged to 53,66 volt and holds it there for all the afternoon (Batt charged at 11:00 )

No grid feedback

Plylontech US3000B spec is

 

Bulk is 53.2 V

Float is around 51 V

Many uses don't know this and will damage  Batt over time

 

This my BMS values from my ICM monitoring software

This will kill the batt over time charging it at 53.66 volts continuously

Even if you look at the BMS info on the inverter it says charging voltage and also indicates its current charging voltage of 53.66 volts

Sunsynk need to bring the charging voltage Down to 52.6 volts to preserve our pylonech batt.

From a diff sources :

Pylontech are all 15S.
Charge voltage is MAX 53.3
If you look at the values indicated by the BMS,
you will see that it clearly says 53.3 max voltage.
And it is not normal for the inverter to keep the
batteries at 53.4 for x hours. When everything is working normally,
the voltage rises and falls at normal rates.

From Victron 

When DVCC is enabled, the battery (via the CAN-bms) is responsible for the charge voltage. The Pylontech battery requests a charge voltage of 53.2V. We have however found that in practice this is too high.

The Pylontech battery has 15 cells in series, so 53.2V equates to 3.55V per cell. This is very highly charged and makes the system prone to go overvoltage.

It should also be noted that a LiFePO4 cell stores very little additional energy above 3.45V.

For this reason we opted to override the BMS and cap the voltage at 52.4V. This sacrifices almost none of the capacity and greatly improves the stability of the system.

We need to get the attention of the Pylontech uses so we can get this sorted by Sunsynk soonest

 

Regards

 

Colin

Hi Guys, Not sure if I may continue on this thread? Please advise if not.

Anyway, I have a 8 kW Sunsynk single phase inverter and seven Pylontech US3000 batteries and 24 x 320W panels.

What is the maximum charge and discharge currents supposed to be? Is it correct to calculate 7 x 37A = 259A?

If that is correct, what is the safest Amps for the inverter and batteries because this seems very high to me?

I replaced a Deye inverter with this Sunsynk and the feedback I got was that the Deye had over current faults which caused it to blow up the CB's.

Your kind assistance will be much appreciated!

Regards,

 

Rudie

11 minutes ago, RudieB said:

Anyway, I have a 8 kW Sunsynk single phase inverter and seven Pylontech US3000 batteries and 24 x 320W panels.

What is the maximum charge and discharge currents supposed to be? Is it correct to calculate 7 x 37A = 259A?

If that is correct, what is the safest Amps for the inverter and batteries because this seems very high to me?

Can you spec the panels (Voc, Isc etc), and confirm if the plan is to run them in series/Parallel or a combination series-parallel

The 8kw sunsynk can accept per MPPT 22Amps (2 mppt inputs)

Edit: to add that the more critical parameter is the voltage range on the PV input. this should never be crossed. Whereas the amps would be clipped/limited by the sunsynk inverter. So going slightly above the limit (lets use 22amps) will not damage the inverter.

• Solar Input
  Max power input – 10400W
  Max V DC input – 370V (100V~500V)
  Max current input – 26A+26A - Some have reported this was lowered back to 22Amps or even 20 in an updated firmware.
  MPPTs – 2
  MPPT Range – 125~425V

24 x 320W panels

7 x 37A = 259A (The amps would not be added if run in series only)

Edited July 27, 20232 yr by Garthox
Added additional info on inverter limiting amps

Hi Grthox,

Not sure about Voc etc but I do know the panels are wired in three strings. I will try to lookup the panel specs. All I know they are JA Solar 320W monocrystalline panels with all black frames. That's as far as I know. Will this impact the maximum charge and discharge currents limits? Sorry I'm just a user and nowhere technically inclined with regards to this subject matter.

My fear is just that with the experience with the Deye inverter they told me the charged and discharge currents were too high. I therefore replaced it with the Sunsynk and settings as per my installer should be the same?

Regards,

Rudie

 

Found the pdf for the panels as attched.

JA SOLAR PANELS.pdf

Edited July 27, 20232 yr by RudieB
Uploaded file

11 minutes ago, RudieB said:

Hi Grthox,

Not sure about Voc etc but I do know the panels are wired in three strings. I will try to lookup the panel specs. All I know they are JA Solar 320W monocrystalline panels with all black frames. That's as far as I know. Will this impact the maximum charge and discharge currents limits? Sorry I'm just a user and nowhere technically inclined with regards to this subject matter.

My fear is just that with the experience with the Deye inverter they told me the charged and discharge currents were too high. I therefore replaced it with the Sunsynk and settings as per my installer should be the same?

Regards,

Rudie

Okay cool, so checking google quick we have;

JA Solar 320W Poly 5BB Solar Panel - Assuming this one for the sake of the checks

Weight: 22.4kg
Depth: 40mm
VMPP: 37.28V
IMPP: 8.58A
Voc: 46.12V

 

3 strings would be 8 panels in series each

this gives: String voltage of 46.12v x 8 = 368.96v (within the MPPT input range)

String amps would be 8.58A each string.

But the three would be in series parallel, just not sure if they would all be on one MPPT or not.

Giving 25.74A (I need to leave this comment Im making to be confirmed).

But that 25.74A (is with in the online 26Amps limit from sunsynk) but if this was lowered in the firmware to 22 or 20A we just need to confirm that this is not too high that the inverter clips down 

 

This is assuming 3 strings are all parallel on one mppt, but they could be split 2 and 1.

 

Something i didnt ask before, is the sytstem all installed, and you are checking. or planning ahead.

If installed could you take a pic of the menu, showing the schematic (like the below)

 

My understanding is you should be fine, but lets get a second opinion, from those more informed than me

 

Edited July 27, 20232 yr by Garthox
I really need to proof read before posting lol

24 minutes ago, RudieB said:

Hi Guys, Not sure if I may continue on this thread? Please advise if not.

Anyway, I have a 8 kW Sunsynk single phase inverter and seven Pylontech US3000 batteries and 24 x 320W panels.

What is the maximum charge and discharge currents supposed to be? Is it correct to calculate 7 x 37A = 259A?

If that is correct, what is the safest Amps for the inverter and batteries because this seems very high to me?

I replaced a Deye inverter with this Sunsynk and the feedback I got was that the Deye had over current faults which caused it to blow up the CB's.

Your kind assistance will be much appreciated!

Regards,

 

Rudie

Your 8kW Sunsynk inverter is capable of charging and discharging up to 190A to and from the batteries at approx 48V. Your batteries should be able to handle that, since the bank can charge/discharge 7x37A = 259A.

Your bottleneck will be in the inverter. If you want to avoid running the inverter at its limit when charging from grid or discharging batteries, you could limit the charge/discharge rate to let's say for example 160A.

Note, though, that with (24x320=7680)W of solar panels attached, your available charging capacity from solar will never exceed 160A, and most of the time it will be  lower as the seasons and days change. It's only with grid charge that you could get close to the inverter's limit.

All subject to the implicit assumption that your wiring and protective devices support this current.

This comment is not related to the PV input Voltage to the MPPT, but to the charger's output Voltage to the batteries.

 

2 minutes ago, GreenFields said:

Your 8kW Sunsynk inverter is capable of charging and discharging up to 190A to and from the batteries at approx 48V. Your batteries should be able to handle that, since the bank can charge/discharge 7x37A = 259A.

 

Hi @GreenFields - just for my info

What are these in reference to (maybe i'm being  little dof and not piecing this together correctly)

7x37A = 259A. - What is the "7" here

10 minutes ago, Garthox said:

Hi @GreenFields - just for my info

What are these in reference to (maybe i'm being  little dof and not piecing this together correctly)

7x37A = 259A. - What is the "7" here

In the original post it was said that this setup has seven batteries installed.

2 minutes ago, GreenFields said:

In the original post it was said that this setup has seven batteries installed.

haha, oh geez, i skim read it and glanced right over the "seven" batteries. I was looking for a 7

Sorry for that 😂

Hi Guys, 

My setup is a Sunsynk 10KW inverter with 4 x Pylontech Batteries (1 x US2000C and 3 x US2000). My settings on the inverter are as per Achmats above with some changes on the charge and discharge Amps. My issue is that my LiBMS on the Inverter just shows 0's. Any advice?

58 minutes ago, PhillipvdM said:

Hi Guys, 

My setup is a Sunsynk 10KW inverter with 4 x Pylontech Batteries (1 x US2000C and 3 x US2000). My settings on the inverter are as per Achmats above with some changes on the charge and discharge Amps. My issue is that my LiBMS on the Inverter just shows 0's. Any advice?

This happens when comms are not setup properly between the inverter and the batteries.

Thanks, would this be a cable issue or dip switches on the batteries? My dip switches is all set to off. Now on the cable I have just made up a cable to blank off PIN 1,2,3 on the battery side, all in on the inverter side, don't see that will be an issue if its blank of the battery side?

Edited August 5, 20241 yr by PhillipvdM

Even with this cable change the issue seems to persist

10 minutes ago, PhillipvdM said:

Even with this cable change the issue seems to persist

what protocol is the inverter set to? Did you switch off then on the batteries after the dip and cable changes?

Protocol 0. Dips are set to off on all and I have switched the batteries off, issue still seems to be the same. I have found another article now that says the cable needs to be set as per the image below: 

 

1 hour ago, PhillipvdM said:

Protocol 0. Dips are set to off on all and I have switched the batteries off, issue still seems to be the same. I have found another article now that says the cable needs to be set as per the image below: 

 

Above works, all fixed now