FoxESS Community - Owners & Installers Forum

Hi there,

I installed 2 LV5200 as part of a Solar install in Feb 2023.
All was good and they operated as expected.

I then got 2 more in Oct 2024. They are all purple labels.
While all the LED seem to be functional on #3 and #4 they only have a single flashing LED in operation. Is this a firmware issue, I have read somewhere about a dormint BMS where the individual charged the batteries up directly using a 48V PSU, although I don't think this is it.

I do have the capacity as I have done tests charging and discharging from 20-90% using a specified rate of charge from the inverter.

They currently appear as Pylontech on a Sofar HYD-6000-EP. I took a voltage measurement this evening on the output of the 4th battery and it read 54V (the system was charging at the time, SOC was showing 92%).
I know you can't really mix batteries and bms but if I was to purchase the 2m cable that goes from the Master to the Inverter, not the link power cable between batteries. Would it be possible or could the output voltage from battery #4 be used to power a 48V DIY Lithium battery.

I also have 4 sockets 230V that are connected to the EPS of the inverter and this supply power if the inverter goes off grid. That would be another option to plug in a charger with a high current output.
The 4 batteries would then act like a buffer charging the plugged in DIY one. Thanks for any comments

If it's working as expected capacity wise, I wouldn't worry too much. You could confirm if the light sequence is correct by looking at the manual.
Remember these have been out of production for a number of years so there isn't a great deal of owners left as high voltage batteries took over the market.

Thanks, I do seem to have the capacitiy alright there must be something slightly different on the last two in positions #3 and #4. I was trying to update the Sofar inverter software the other night but it was failing so I abandoned it.

Had a bit of trouble getting the batteries online again, might appear for a few minutes but only 300Ah then disappear from the inverter etc, which is only 3 and them go into alarm mode with LED flashing for the sequence for a communication failure. However the dip switches were set for 4 so that was probably some of the issues. All good now again. I think it might be something to do with the sequence of how I was rebooting them or the inverter or not allowing enought time etc.

The LV5200 batteries have a discharge / charge of 100A. I measured it and there was 57V across the pins of the output of battery #4 (last battery).
If I attached a cable (same type as from inverter to master) could I power another battery in parallel such as a DIY type 48V ? Would there be any current issues ? I think while the BMS on the inverter might only read the fox batteries as they were connected via a can cable, would I be correct in that the existing and new additions would charge and discharge in proportation to its other re capacity ...