Good day
I have a RCT-AXMK2-5K-48V inverter with 2 x B3 Dyness (3.5kWh - 37A) Lithium Batteries and 6 x CNBM 6P 330W Polycrystalline Silicone Solar Panels (wired up in 2 x 3 panels) Solar System.

My inverter settings are as follow:
01 - SBU
02 - 70A
03 - APL
04 - SdS
05 - USE
06 - L?E
07 - t?E
08 - 230V
09 - 50Hz
11 - 30A
12 - 48V
13 - 51V
16 - SNU
18 - bON
19 -?EP
20 - LON
22 - AON
23 - byE
25 - FEN
26 - 51.8V
27 - 50.3V
28 - PAL
29 - 46.0V
30 - ONE
31 - SbE
32 - 30
33 - EdS
34 - 53.2V
35 - 60
36 - 120
37 - 30d
39 - AdS

I am new to Solar and do not really understand all the nitty gritty of Solar.

Can you please tell me if the settings in my Axpert Inverter are correct?

My system was installed a few weeks ago.
A week ago I noticed a red light on my bottom battery (Secondary)

I then switched off the Eskom power to inverter as welk as Solar panels so that everything is running off battery power only.

Everything went fine and the red light turned off on battery, but I got an error 04 when I switched on some extra items like kettle...

I then changed setting nr 29 to 46V which stopped the alarm.

Then, after a while (Battery Voltage at 48 V on Inverter LCD Panel), I switched on the Panels as well as Eskom to the inverter.
At first it stayed in Bypass Mode, then after a while, the bypass mode was off.

Then after a while, I started to get an error Code 04 with usage at 75%

Any help will be appreciated very much

On 2020/06/28 at 8:51 PM, Wickus said:

I have a RCT-AXMK2-5K-48V inverter with 2 x B3 Dyness (3.5kWh - 37A) Lithium Batteries and 6 x CNBM 6P 330W Polycrystalline Silicone Solar Panels (wired up in 2 x 3 panels)

That's a model with a 450 V max SCC, right? 120 V min MPPT voltage. So you'd want all 6 panels in series. Unless I misunderstand your wording, that could be the basis of frequent battery low (code 04) warnings.

6 x 330 W = 1980 W nominal is pretty light for a 5 kW inverter; they like about twice that number. Your other settings look OK.

On 2020/06/29 at 1:03 PM, Coulomb said:

That's a model with a 450 V max SCC, right? 120 V min MPPT voltage. So you'd want all 6 panels in series. Unless I misunderstand your wording, that could be the basis of frequent battery low (code 04) warnings.

6 x 330 W = 1980 W nominal is pretty light for a 5 kW inverter; they like about twice that number. Your other settings look OK.

Hi Coulomb

Thanx a lot for the reply.

Yes, you are right. 

It is the model with a 450 V max SCC and120 V min MPPT voltage.

So, you suggest that I must connect all 6 panels in Serie?

They are currently connected in 2 pairs (3 in serie )

The installer wanted to install it in 3 sets of 2 panels, but when we saw the minimum of 120Volt, we changed our minds to 2 sets of 3 panels.

8 hours ago, Wickus said:

So, you suggest that I must connect all 6 panels in Series?

Yes, 6S is ideal for this model. 2S3P would be ideal (assuming that they are 72-cell panels) for a 145 V max model.