SolarAssistant, SRNE Inverter and low voltage values in battery settings

Hello, my first post and question in this forum. I hope Beginners Corner is the right place.

I am using a SRNE HYP4850S100-H Inverter, 10x 550W Panels and a Huawei ESM-48100b1 Battery with SolarAssistant.

I chose the used Huawei battery because I hadn't enough time to order and wait for a new LiFePO4 battery in the last two weeks in Thailand when the above configuration was installed.

I have a "small" problem understanding the shown values for the various voltage settings in SolarAssistant:
The good: Battery is shown with correct values

The ugly:
Why do I see these low values for the battery voltages only (they should be 4x bigger)?
Is this a problem with the configuration in the SRNE Inverter with this specific battery (no direct communication possible with the Huawei)?
In Home Assistant I can see that the voltage values are changing over time (so it seems to be working anyway).

The bad:
I did not find any information regarding the no. of cells in this Huawei ESM Battery. In the Inverter I have to select 14, 15 or 16 cell Li battery. The nominal charging voltage is shown as 53,5V or 65,4V for this battery in different pdfs.

I send an email to SolarAssistant but on their site the recommend asking question here in this forum. So I try this too.

Thanks in advance for any hint or explanation.

Ban said:

I did not find any information regarding the no. of cells in this Huawei ESM Battery. In the Inverter I have to select 14, 15 or 16 cell Li battery. The nominal charging voltage is shown as 53,5V or 65,4V for this battery in different pdfs.

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It looks like this is a 15s battery. Charging to 53.5V (~3.57V/cell) should be fine.

Ban said:

Why do I see these low values for the battery voltages only (they should be 4x bigger)?

Click to expand...

Ignoring Solar Assistant for a minute... What does the inverter report for these settings if you use its interface? It's a 48V inverter, so you shouldn't even be able to set it to have those values.

Ban said:

Is this a problem with the configuration in the SRNE Inverter with this specific battery (no direct communication possible with the Huawei)?

Click to expand...

The inverter shouldn't need to communicate with the batteries.

Thanks!
a) I selected the 15s option already. But I wasn't really sure.
b) I can't tell right now. A problem with distances (The inverter is in our house in Thailand, and I stay in Germany right now). I need to ask someone there for help showing me the values (I already have a camera installed and might even see it myself).
And when I installed everything in the last two weeks I didn't see any strange values on the display.
c) That was the reason I decided to buy a second life battery. I assumed that the voltage information should be enough.

This is a known bug with SA / SRNE inverters, SA said they were working on a fix awhile back... Just multiply the 12V values by 4.
You won't be able to adjust them through SA, at least I can't with my ASF.

Welcome to the forum.

Many inverters have firmware that can be configured to operate the inverter at 12, 24 or 48 volts. Same firmware in each inverter with several "Constants" that define if the inverter battery voltage is 12, 24 or 48.

My SGP SPH10K48SP (SRNE Clone) for example has a modbus register SYSTEM_VOLTAGE_RATE_READ_ONLY = 0xE003 that has a value of 48. This value is set during inverter build/production. The software SGP provided (iPower.exe) also shows the various battery voltages as if the inverter were a 12 volt inverter even though the various battery values on the inverter configuration screen are correct.

I can read the various battery modbus registers and they all provide values for a 12 volt inverter. The values have to be multiplied by 2 for 24 volt systems and by 4 for 48 volt systems.

SA can either require the user to set the battery voltage on the "Configuration" screen or get the value from the inverter and use this for the multiplier.

One firmware source code is easier to maintain and fix than three. Just set a couple of constants during production and all is well.

Thanks. Simple explanation and until a solution in SA is available I will use my basic skills for these values.
Very nice to get answers so fast and with real explanations!

I just got a reply from the SA support:

You will see using the same inverter USB cable using the official SRNE software from a PC or laptop that the battery settings are reported in the 12V range and there is no way for us to change it.
You can try and find collaboration with the inverter supplier or manufacturer as to why they report the values this way.
In future we will look at adding a advanced multiplier setting so that it looks correct in SolarAssistant.

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So I will live with the workaround and hope for the multiplier setting in SA. But doesn't feel like a priority there.