Over recent months I’ve developed two Arduino compatible programs. one for any Victron battery monitor, the other any Victron solar controller. These programs bring together all the following knowledge to receive, dissect, decrypt, decode and report the current device status and readings from the ‘a…

This is great and impressively well documented :rocket:. It also begs the question whether it’s feasible to make the output ve-direct compatible to enable BT wireless connections to a Cerbo GX. In read only mode and a manual transfer of settings to fill in the blanks not advertised.

Very cool @ChrisJ7903 and nicely documented project in GitHub. This post might find more like minded people in the modifications space, I’ll move it there now.

I’m working on a couple of loose ends for these 2 programs and I need some Victron expertise/help regarding the 0 .. 51A “Load current” field listed near the bottom of the Solar Charger table in your famous “Extra Manufacturer Data” document. [Solar_Charger_table] What current is this meant to re…

Hi @ChrisJ7903 The load current is the current on the load output of some MPPT chargers like the 75/15 ( 12 / 24 Volt | Victron Energy ). Your MPPT model does not have a load output, so the value should be 0 or 0x1FF (as there is no load output). With kind regards, Thiemo van Engelen

Hi Thiemo, OK that explains, thanks. I think I’ll add a switch into the SC code to turn Load Current reporting ON or OFF, then users can decide depending on their model. However I mispoke in my last post: now that I’m looking closely at my MPPT100/30 output when running the sketch, I see my Loa…

Hi Chris, The decoding seems to be correct. It would be useful to have the full advertisement data. Perhaps that shows something that might be going wrong. I will also try test this myself somewhere in the coming days. Regards, Thiemo van Engelen

Thiemo, This could be the data you’re after. Herewith a snapshot of the serial output from my development version of the SolarController program, running in VERBOSE mode. [SC_F_output] The data: line is the raw manufacturer data [26 bytes]. The output: line is the decrypted data [16 bytes]. Al…

Hi @ChrisJ7903 I must admit that the error is caused by my code that I contributed to your project. I changed the byte wise copy in a for loop to a call to getBytes(). The API is however poorly documented and it seems that when calling getBytes(buffer, len), it does not copy len characters, but it …

I’ve updated both BatteryMonitor and SolarController progams on GitHub: Added optional FILTERING for rejection of dud readings based on user nominated threshholds for each parameter for SC only: added LOAD_AMPS boolean to suppress loads amps reporting on unsupported models Improved callback handli…

Arduino programs to read Victron Bluetooth advertised data

Modifications

ChrisJ7903 (Chris) 5 June 2025 03:51 10

Thanks, that works!
I’ll follow it through to GitHub … (soon-ish)

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Arduino programs to read Victron Bluetooth advertised data

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