My Victron Message; Solar Charger - Portable PV 360W [278], Error code: #66 - Incompatible device encountered for parallel operation (e.g. old firmware/different settings) My MPPT ‘Smart’ equipment; I have 2 MPPTs, a 150/100 and a 100/50. Both are connected via VE.Can. My 150/100 MPPT rec…

[image] GP: 100/50 cannot be upgraded to v3.XX ? That it is too ol Nah, different units will have different FW versions, the larger units like your 150/100 have different FW files than the smaller units like 100/50, 100/30 etc. They don’t need to be -and in fact can’t be- on matching firmware…

[image] GP: Check each MPPT: Battery voltage (12/24/48) By check - did you select which voltage your system is and set it with a pin? [image] GP: Solar Charger - Portable PV 360W [278] Do you have this one panel connected to both mppts? [image] GP: 100/50. Both are connected v…

Sorry, I did initially consult AI, but copied and pasted it into a word doc. I simply wanted to be thorough in detailing my steps. I will post below a PDF of my diagram.

Maybe my MPPT 100/50 (sn HQ2110*****) is not a VE.Can model ? I said it was a VE.Can only because that is where I plug it into my Cerbo GX, beside my other MPPT 150/100. Is that why I can’t update the firmware to match my MPPT 150/100 (sn HQ2135* ). The Error code: #66 only begun today (I updated…

[image] GP: I said it was a VE.Can only because that is where I plug it into my Cerbo GX There aren’t any 100/50s that have VE.Can. You’re likely confusing VE.Direct with VE.Can, since VE.Direct ports (4-pin rectangular) are directly above the VE.Can ports (RJ45) on the Cerbo, and some users …

Yes, you are correct, I just checked, and both MPPTs and my Shunt are plugged into VE.Direct, not VE.Can. My error, thank you for pointing this out.

As requested by LX, I am reformulating my post as follow; I started getting the following messages (today May 7/26); Message; Solar Charger - Portable PV 360W [278], Error code: #66 - Incompatible device encountered for parallel operation (e.g. old firmware/different settings) My installation dia…

My Settings Vic & Batteries.pdf (2.6 MB)

I edited your SNs - this is a public forum, readable by anyone including scrapeable by bots and AI agents, so generally not advised to post full SNs here. What’s the OS version on your Cerbo? It being either outdated or possibly just installed a new update that’s buggy would be my first thought as …

Solar Charger - Portable PV 360W [278], Error code: #66

DIY

nickdb (Nick) 7 May 2026 17:47 2

There’s a 100/50 with CAN connectivity?

Never ever, ever, ask an AI a technical question.
If victron haven’t managed to create a reliable agent, a tech company sure won’t by trawling the internet.

From the docs and referenced on this very forum:

Topic		Replies	Views
Different firmware on MPPTs Q&A and troubleshooting beginner , offgrid , parallel , vrm , mppt_controllers	9	296	24 April 2025
Error code #66 Incompatible device warning after MPPT firmware update to v 3.16 DIY diy , domestic , mppt_controllers	19	1435	8 October 2024
#66 incomaptible device DIY diy , domestic , mppt_controllers , cerbo_gx	1	116	25 March 2025
Error #66 on 2 out of 3 MPPTs Q&A and troubleshooting beginner , mppt_controllers	11	151	25 January 2026
Old Blue and new smart MPPTS via VE.CAN, former stops charging Q&A and troubleshooting offgrid , professional , multiplus-ii , gx_device , cerbo_gx	11	242	28 January 2025

Solar Charger - Portable PV 360W [278], Error code: #66

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