What are the modbus register values of the cerbo gx gui-v2 item DC Loads? [Screenshot_20251227-093000 (1)] I think this item cames up after a firmware update of my PYTES V5 batteries. Hint: The 625W shown in the screenshot are the power of the PYTES V5 heating pads.

[image] MSl1: But the main problem is, I cannot read this value via modbus. That’s a real shame. Hi @MSl1 The Modbus register for DC Loads it’s register 860, DC System Power.

That will only appear if you have enabled “has DC loads” in system settings. It is a calculated value by the GX.

It means, only the local gui has access to this value or can I access via modbus to this value, or values like V and A and compute the power by myself? And the PYTES V5 heating pads are a battery internal devices. How can the gx device “see” what happens inside the battery? It is not a BMS CAN p…

Do you have a shunt? If so what role is it configured to. If you check settings → system is “has DC loads” enabled? If so turn it off and the box will disappear. This setting behaves like so (from the manual) : Enable this for boats, vehicles and installations with DC loads and chargers - in a…

No shunt. Now I check the settings. Yes, if I disable the switch “Display DC Loads” the box disappears. My idea was: Read the “DC Loads” value via modbus and show it in my Home Assistant Overview. So I never had to call the gui-v2 extra in the browser. Now it fluctuates back and forth within a na…

Normally, when you check the “Has DC System” option, the DC Load value is calculated automatically by the Cerbo. These calculations sometimes match reality, but sometimes they are completely wrong. If you actually have DC-side loads and you care about accurate current consumption measurements, you …

Now, the system runs on battery, the DC Loads value is around 25W. This should be the power consumption of the cerbo gx device. [Screenshot_20251230-175555 (1)] Could be the right value. :upside_down_face: But the main problem is, I cannot read this value via modbus. That’s a real shame.

You can calculate it yourself by subtracting the current (A) readings between the battery and inverter , then multiplying by the bus Voltage for power.

Yes, I will inspect the relevant modbus registers. Then I’ll see what happens next. :grinning_face: A little problem is the fast fluctuation of the current (A) values. The results from the modbus become very inaccurate. But the level (~50W or ~700W) gives me the information I want. [Screenshot_2…

In the morning, the batteries reached my Minimal SOC of 30% and gone into state IDLE, the voltage difference remains. [Screenshot_20251231-063358 (1)] [Screenshot_20251231-063723 (1)] [Screenshot_20251231-063418 (1)]

Wanted: GX modbus register values of gui-v2 "DC Loads"

Q&A and troubleshooting

MSl1 31 December 2025 11:15 14

And is it the value I have looked for.

… The PYTES V5 heating pads have just started working.

Topic		Replies	Views
Issue with AC Readout on Cerbo GX DIY beginner , offgrid , gx_device , cerbo-gx	1	62	5 September 2025
Are there Modbus registers that I can write to to show AC Loads and Inverter / Charger status? EVCS diy , modbus_tcp , modbus	3	143	27 August 2025
Cerbo GX Inverter details not populating AC load or DC use DIY marine , diy , energy_meter , victron_community , cerbo-gx	0	62	17 July 2025
Node Red virtual Battery and virtual Inverter - problems with AC Load Q&A and troubleshooting diy , node-red , gx_device , cerbo-gx	0	54	14 January 2026
Modbus holdingregister für Victron Energy Venus GX Deutschsprachiger Bereich	2	171	8 March 2025

Wanted: GX modbus register values of gui-v2 "DC Loads"

Related topics