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PylonTech US3000C with RCT-Axpert


TheOracle
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I'm about to upgrade my old batteries to a PylonTech US3000C. I have a RCT-Axpert 5K inverter(I have attached the label for the inverter). Would appreciate if someone could help with the following:

I assume I must upgrade the firmware, is the dsp_LF1_74.40e pf1 the correct one? 

Do I have to install the communication cable between the battery and inverter. 

Other than for monitoring, do I need the icc software? 

Which Amp dc fuse is recommended between the battery and inverter?

 

 

 

 

 

IMG_20210602_093017.jpg

Edited by TheOracle
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2 minutes ago, TheOracle said:

I assume I must upgrade the firmware, is the dsp_LF1_74.40e pf1 the correct one?

No. For your model (same as my two), you need the LFP flavour of patched firmware version 73.00e . It's not mandatory to update the firmware, but it will make life easier.

4 minutes ago, TheOracle said:

Do I have to install the communication cable between the battery and inverter. 

.No, because you don't have an RS-485 port or the removable display processor to talk to the BMS.

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16 minutes ago, TheOracle said:

I have set the bulk charging voltage at 53.2 and Float at 52.2

Is that fine? 

I take it that the US3000C runs the same as the US3000B.

In that case, the generally recommended values (here in the forum) are Bulk 52.5V and Float 51.8V.

You can find the detailed explanations for those values somewhere here in the forum.

I have been running with these values for 2 years without problems.

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18 hours ago, wolfandy said:

I take it that the US3000C runs the same as the US3000B.

In that case, the generally recommended values (here in the forum) are Bulk 52.5V and Float 51.8V.

You can find the detailed explanations for those values somewhere here in the forum.

I have been running with these values for 2 years without problems.

I am running those settings as well and they are perfectly suited for US2000;US2000B;US2000Plus;US2000C;US3000A;US3000B;US3000C;UP5000

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  • 2 weeks later...

My system ran fine for the last two weeks since I installed the new battery, but the last two days the inverter stopped with an error 52 (bus voltage too low). It works fine again after I restart it. 

Both days it happened around 12 o'clock during the day, once the battery is almost fully charged. 

I never had this issue on my old batteries. 

I didn't upgrade the Axpert's firmware. 

Any advice would be appreciated. 

Edited by TheOracle
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1 hour ago, TheOracle said:

the last two days the inverter stopped with an error 52 (bus voltage too low). It works fine again after I restart it. 

Both days it happened around 12 o'clock during the day, once the battery is almost fully charged. 

Are you running the 52.5 V bulk/absorb setting (setting 26)? If so, as an experiment, knock it down a notch to 52.4 V and see if that helps. Otherwise, change it to 52.5 V, as 53.2 V is way too high. My guess is that the battery is disconnecting due to excessive battery voltage. It will disconnect at 54.0 V, and Axperts have a propensity to overshoot the set voltage.

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20 minutes ago, Coulomb said:

Are you running the 52.5 V bulk/absorb setting (setting 26)? If so, as an experiment, knock it down a notch to 52.4 V and see if that helps. Otherwise, change it to 52.5 V, as 53.2 V is way too high. My guess is that the battery is disconnecting due to excessive battery voltage. It will disconnect at 54.0 V, and Axperts have a propensity to overshoot the set voltage.

Thanks for the suggestion Coulomb!

have changed setting 26 to 52.4 (it was on 52.5), I will monitor and see if it helps. 

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1 hour ago, TheOracle said:

I have now also upgraded the firmware.

Congratulations.

1 hour ago, TheOracle said:

The inverter console say my version is now LF1.73.00E. Is that correct?

Technically, the firmware is the LFP flavour of patched firmware version 73.00e; the "1" comes from the "U1" settings label for main firmware versions, when they are non-patched. Other firmware versions have labels U2 through U4; only U2 on your model (and only when there is PV power available to power the Solar Charge Controller).

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  • 3 weeks later...
2 hours ago, anunnaki said:

Can he connect his batteries without upgrading his inverters from 73.00C into newer firmware  version?

If he has the LC flavour (for Lead aCid and other non-LFP chemistries) of patched firmware version 73.00c, then he would be well advised to switch to the LFP flavour, but it's not strictly essential. He might as well go to version 73.00e while he is updating.

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