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SOC at 78c, sunsynk 5.5KW inverter and 4x Pylontech US3000c


HannesZ
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28 minutes ago, YellowTapemeasure said:

How long has it been sitting on 78%?

The Pylontechs usually sit for a long time at around 80%, and then quickly reach 95 and then 100%.

 

Most of the day. Its not taking any power. That is what is strange. 

 

Two of the 4 shows 5 SOC leds while the other only flash the running led intermittently. 

System is new. Turned on yesterday so I'm still getting to know it. 

Thanks for the answer. I'm still not sure evething is all good, 

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13 minutes ago, HannesZ said:

Most of the day. Its not taking any power. That is what is strange. 

 

Two of the 4 shows 5 SOC leds while the other only flash the running led intermittently. 

System is new. Turned on yesterday so I'm still getting to know it. 

Thanks for the answer. I'm still not sure evething is all good, 

OK, so all that I do know is that something interesting is happening with Pylontechs at around 80%. Your setup seems to be correct, so it's not that, but you do have control of the batteries in the best possible hands, the Pylontech master battery BMS. There may be a reason why it is not drawing a charge current, it is a new system so it could be busy balancing the other 3 batteries, which could take everything from 1 day to 1 week to complete (the latter has been reported by some members).

If I were you, I would leave it alone and monitor, if everything is still the same after 1 week, then contact the supplier.

In the meantime, why not take some pics of your setup and share them? We have many Sunsynk / Pylontech fans here who love pics, especially the panels. More is better 🙂

Edited by YellowTapemeasure
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It will take a few days for the batteries to settle.

Download batteryview.exe and putty and then you can look at each cell to see what its doing.

You probably need to stop the charging, keep the batteries in parallel for a few days for them all to equalise and then to charge.

You will find some cells will go "over voltage" and "High Voltage" and then after a few days they will all settle down.

With my newly aquired US3000 B, it took 4 days for 1 battery to settle own.

It also helps to discharge them to say 50% and then recharge a few times.

Edited by FixAMess
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Only thing I can think of is that the batteries are not balanced. There's a YouTube video on the correct way to balance pylontech batteries the first time they are setup. You should let them balance overnight or a couple of days before connecting them to the inverter. 

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2 hours ago, Achmat said:

Only thing I can think of is that the batteries are not balanced. There's a YouTube video on the correct way to balance pylontech batteries the first time they are setup. You should let them balance overnight or a couple of days before connecting them to the inverter. 

OK I will give it a few days and see how it goes. 

 

I honestly can't see how one can have it charge/balance before connecting to the inverter. 53v dc is not something one usually have access to.

 

But let see how this goes over the next few days. I really hope eskom don't come with there shedding again soon

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9 minutes ago, HannesZ said:

OK I will give it a few days and see how it goes. 

 

I honestly can't see how one can have it charge/balance before connecting to the inverter. 53v dc is not something one usually have access to.

 

But let see how this goes over the next few days. I really hope eskom don't come with there shedding again soon

Batteries will be stored at 50% SOC but there can be differences. One battery could be 60%, another at 55% and the other two at 50% SOC. 

If you connect them to each other, the BMS will balance each battery to be the same SOC. You can still do this by just disconnecting the cables going to the inverter and switching all the batteries on. 

 

https://youtu.be/hTM-YMFiyns

Edited by Achmat
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4 hours ago, HannesZ said:

Darn. I should have done that. Well no change now so it has a week to sort it self out. 

As Achmat said, you can do it now too. Perhaps wait for the batteries to reach around 75% from solar and then disconnect them from the inverter until the sun begins to set. 

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  • 6 months later...

Just wanted to find out. When connecting the Pyontechs US3000c to the Sunsynk 5KW. I selected the lithium option under battery settings as well as CAN option and BMS_Err setting. All seems to work fine and also noticed the perceived pause at 89% when charging.

1. On the page where lithium is selected, at the bottom left what is the Activate checkbox for? mine is unchecked but still works fine.

2. Does it matter what the Float, absorption and equalisation are set to? Or does the BMS handle everything .

Even though i suspect it is not being used, mine is set to : Float: 51.8V

                                                                                        absorption: 52.5V

                                                                                         equalisation: 53V (I also understand that equalisation is more for lead acid type batteries)

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