HM-400 power values incorrect above 60% load?

[juepi]

Platform

ESP32

Assembly

I did the assembly by myself

nRF24L01+ Module

nRF24L01+ plus

Antenna

circuit board

Power Stabilization

Elko (~100uF)

Connection picture

• I will attach/upload an image of my wiring

Version

0.8.141

Github Hash

85f8540

Build & Flash Method

AhoyDTU Webinstaller

Setup

2 inverters, 1x HM-300 and 1x HM-400

Debug Serial Log output

No response

Error description

I have some strange behavior, no idea if something's wrong with my new inverter or if it is related to AhoyDTU:
I have just installed and added a new HM-400 inverter to my setup, replacing an HM-800 (deleted HM800 from config, rebootet, re-added HM-400).

Everything is working fine, except that the HM-400 seems to "limit" all the power data reported to ~257W AC (~270W DC), which equates to around 64% load.

Note: Inverter disabled when screenshot was taken, thus 0W AC output.

If i set the power limit higher, according to my SmartMeter more power is produced, although it seems to me that the percentage of the load does not match the produced power any longer. Settings inverter limits above 64% seem to cause higher power output than it should.

Both of my inverters seem to have the same Hardware and firmware versions:

Firmware Version / Build	1.00.14 (build: 2021-12-09 12:46)
Hardware Version / Build	5.12 (build: 28/2022)
Hardware Number	10101000
Bootloader Version	1.02

They also have the same grid profile, the HM-300 works perfectly well. I have to mention that both inverters are powered by a 8S LFP battery, so 25~28V at the PV input.

Wondering if someone had similar problems?

thanks,
Juergen

[juepi]

After running additional measurements it seems that also my HM-300 suffers from this problem.
I have found out that the root cause is probably related to the low DC input voltage, as quite a few other Hoymiles users reported such issues (in example OpenDTU-on-Battery Issue).

Closing this issue as it's most probably a "by design" issue not related to AhoyDTU.