Hi all

I have a clone Axpert 4KW, purchased from TheSunPays along with 2 of their 48v 100ah LiFePO4 batteries.

For obvious reasons I would like to have the BMS communicating with the inverter. According to TheSunPays, the inverter runs the voltronic protocol.
Now, the battery has a 6pin RS232 Coms connector and the inverter an 8pin RS232 Coms connector.

Would it be possible to have these communicate with the inverter?

TheSunPays hasn't been of much help, first we are told we need to buy a Pylontech cable from Centurion Solar, then we need a different inverter, then the different inverter cant communicate with our batteries so we would need different batteries.
Out thinking was that because both batteries and inverter are being sold as kits from TheSunPays, we were under the impression that its compatible, however they have now told me that they never advertised it as 100% compatible. We really dont know what else to do and we have invested over R100k in the system with solar panels.
Any suggestions would be awesome.

On 2020/07/29 at 6:58 PM, Bl4d3 said:

Hi all

I have a clone Axpert 4KW, purchased from TheSunPays along with 2 of their 48v 100ah LiFePO4 batteries.

For obvious reasons I would like to have the BMS communicating with the inverter. According to TheSunPays, the inverter runs the voltronic protocol.
Now, the battery has a 6pin RS232 Coms connector and the inverter an 8pin RS232 Coms connector.

Would it be possible to have these communicate with the inverter?

TheSunPays hasn't been of much help, first we are told we need to buy a Pylontech cable from Centurion Solar, then we need a different inverter, then the different inverter cant communicate with our batteries so we would need different batteries.
Out thinking was that because both batteries and inverter are being sold as kits from TheSunPays, we were under the impression that its compatible, however they have now told me that they never advertised it as 100% compatible. We really dont know what else to do and we have invested over R100k in the system with solar panels.
Any suggestions would be awesome.

Sunpays leaves a bad taste in the mouth.. clearly they missinformed you and sold you incompatible equipment. Thats why I always recommend main stream product buying cheap is not always the best option however there are many Axpert Gurus here maybe one of them can pull a rabbit out of the proverbial hat.

Hi, I have an Mecer Axpert MK II 5kW inverter with 2 x 48V Lithium Iron batteries. I do not use the communication cable as it was confirmed several times now that this Inverter does not communicate with an external battery.

Fortunately the batteries do have their own BMS, so you set one as the Master, the other as follower and a comms cable between the batteries (only).

On the Axpert the battery type is set to 'user' (setting 5), and then check the battery specs for setting the charge amps, charge Voltage and Float V.

Is your setup complete and the batteries used as a DC input at least ?

Greetings 

Jaco P (Bloem)

I am going to upgrade from a Must 24v system to a Navasolar PV1800 48v system and 2 48v navasolar 15cell batteries. What voltage did you set your setting 20 and 21 to?

Edited March 8, 20251 yr by Jarrod

On 2025/03/07 at 11:52 PM, Jarrod said:

I am going to upgrade from a Must 24v system to a Navasolar PV1800 48v system and 2 48v navasolar 15cell batteries. What voltage did you set your setting 20 and 21 to?

Hey Jarod, did you get this system?

I did the same setup, but went with 2 x Pv1800 in Parallel. Having a few issues. Have you had any issues?

Hi I changed setting 1 to sol and setting 20 to 48v and setting 21 to 48.2. Setting 17 53.5v and 18 to 53v seeing as the batteries are 15s. I only use solar to charge . I have 6 canadian solar 550w panels. I'm running this system separate from my eskom db and had a electrician wire up the system to its own db all coc of course. I have a few dedicated inverter plugs points around the house running different things. Normally even now in winter my system is fully charged by about 13:30 depending on weather conditions and heater or aircon usage.

So far it's been good. No complaints from my side. Although I did buy 2 inverters I decided only to use 1 and keep the other one for spare. I would probably get flamed on this forum for not using coms cable but so far for my use it's been good. If more info required on my settings just ask👍

Edited May 1, 20251 yr by Jarrod
Added offer to help with settings