Hello everyone. I hope I find you well. I have a 3kva 24v sunmagic inverter. My challenge is that it's switching to 12v charging parameter and doesn't charge at all in that setup. Could this be a firmware issue?

 

 

 

 

 

 

I don't think firmware should do that, after all, the label does not mention 12V at all, thus I'd think the unit may have a fault, but I don't know this unit at all, so I could be wrong.

Looking at the serial number 202010.... might indicate that the unit is barely or less than a year old, so hopefully it still is under guarantee and the supplier can help resolve the issue.

The smaller models (less than 4 kW) often have firmware that handles a variety of models, with different power ratings and battery voltages. At power-up, the processor reads one or two pins and based on the voltage found there, sets itself up for a particular power and battery voltage combination. It seems to be reading the wrong voltage in this case.

Another possibility is that it's a clone, and the clone makers have copied the wrong firmware, or not set up the resistors correctly.

Either way, it's not fit for purpose, so you should demand a replacement. At the very least, they could send you a new control card, which is where the power/voltage combination is determined. Though some smaller models have the control chip on the main board, in which case you'd need a new main board.

Good luck getting it fixed.

It's a shame if they have to junk that unit; all it takes to fix it is to replace one or two resistors that cost less than one US cent each. But which ones and which values? Unfortunately, schematic diagrams are not published.

9 hours ago, Coulomb said:

The smaller models (less than 4 kW) often have firmware that handles a variety of models, with different power ratings and battery voltages. At power-up, the processor reads one or two pins and based on the voltage found there, sets itself up for a particular power and battery voltage combination. It seems to be reading the wrong voltage in this case.

Another possibility is that it's a clone, and the clone makers have copied the wrong firmware, or not set up the resistors correctly.

Either way, it's not fit for purpose, so you should demand a replacement. At the very least, they could send you a new control card, which is where the power/voltage combination is determined. Though some smaller models have the control chip on the main board, in which case you'd need a new main board.

Good luck getting it fixed.

It's a shame if they have to junk that unit; all it takes to fix it is to replace one or two resistors that cost less than one US cent each. But which ones and which values? Unfortunately, schematic diagrams are not published.

Thank you!

9 hours ago, Kalahari Meerkat said:

I don't think firmware should do that, after all, the label does not mention 12V at all, thus I'd think the unit may have a fault, but I don't know this unit at all, so I could be wrong.

Looking at the serial number 202010.... might indicate that the unit is barely or less than a year old, so hopefully it still is under guarantee and the supplier can help resolve the issue.

Many thanks!

On 2021/04/15 at 9:21 AM, Wanda said:

Hello everyone. I hope I find you well. I have a 3kva 24v sunmagic inverter. My challenge is that it's switching to 12v charging parameter and doesn't charge at all in that setup. Could this be a firmware issue?

 

 

 

 

 

 

Hi Wanda, how you doing? I have the same question, did you sort this out? Drop me a message 0833961208