Hello everyone, I have two Tommatech Mplus 11 kVA hybrid inverters. I want to connect them in parallel. However, their software versions are different, and I haven't been able to find the software anywhere. Is there anyone who can help me with this?

Edited September 8, 20241 yr by Macarxp

What are the present (U1) firmware versions? 

First: u1 73.03, u2 112.14

secondary: u1 73.04, u2 12.21

The latest main (U1) firmware in that series is 73.78, available here:

https://powerforum.co.za/topic/20595-axpert-max-i-11kw-100v-sticking/?do=findComment&comment=197048

For unpatched factory firmware, choose file name dsp_73.78_original.inv . Or choose one of the patched versions for improved MPPT performance in cloudy weather.

Edit: However, it's not essential to have identical firmware, but the closer the better, and identical is best. So you could try paralleling them with the different firmware versions if you want, or if you have trouble updating the firmware.

Edited September 9, 20241 yr by Coulomb

My device is TommaTech. The software you sent is Axpert. Will this cause any issues?

42 minutes ago, Macarxp said:

My device is TommaTech. The software you sent is Axpert. Will this cause any issues?

Many of these inverters are rebranded Axperts; some are clones, a few are work-alikes. A quick search indicates to me that TommaTech are a genuine Voltronic rebranding, but I can't quickly find the label on the side that usually clinches this determination.

Either post a photo of the label here (preferably with some screws and the small sticker with the manufacturing date also visible), or check Do I Own a Clone? if you'd like to me more certain.

The photo I saw looked exactly like an Axpert E 11 kW model, and the 73.xx main firmware and y12.xx display firmware are correct for an Axpert 11 kW '28066 non-twin, so I think that there is little doubt that the indicated Axpert firmware will work.

s this exactly the photo you wanted?

10 hours ago, Macarxp said:

Is this exactly the photo you wanted?

Yes. Interesting. The serial number is wrong, compared to what I'm used to, there is no barcode, and the QR code has only the serial number.

But the rest looks totally legitimate, and sometimes bigger resellers are allowed significant variability of the sticker and serial number.

I've now gone from 98% sure it's legitimate to 90%. So there is still a very good chance that updating the firmware will work.

But if you don't like those odds, there is about a 98% chance that running with your existing firmwares should work.

I recommend checking the voltage difference in the outputs before final paralleling, by putting one multimeter lead on each output. The reading should be well under 20 VAC, preferably under 5 VAC.

Thank you for your interest🙏

Hello again. I successfully installed the 73.78 version you shared on the devices earlier, and I want to thank you very much for that. I have another device of the same model, but when I try to install the version 57.67 software you shared on this device, it gives an error. I would appreciate it if you could share the appropriate firmware for this device, preferably the 150V modded version

Salut i need New upload 

Sorry, I didn't notice this post somehow.

On 2025/01/01 at 12:53 AM, Macarxp said:

I successfully installed the 73.78 version you shared on the devices earlier, and I want to thank you very much for that. I have another device of the same model, but when I try to install the version 57.67 software you shared on this device, it gives an error.

57.xx seems to be the '2809 version of the 73.xx '28066 firmware. If you try to load 57.xx firmware onto a model that came with 73.xx firmware, the reflash tool will give an error, and the firmware won't be touched.

It's not clear to me what firmware and model combination you are talking about.

It should be possible to parallel inverters with 57.xx firmware with inverters with 73.xx firmware (beware, there are other totally different firmwares with 73.xx firmware, such as my ancient MKS 5kVA 4kW models now running patched versions of 73.00, and some VM IIIs. As long as they are both 11 kW Max E non-Twins, they should parallel OK, despite the different firmware versions.

On 2025/02/09 at 7:09 PM, fakih hamed said:

Salut i need New upload 

Welcome.

We need far more details about what you need, preferably including an existing firmware version number, and what you hope to get fixed by the newer firmware.