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Megarevo 8K Firmware Update

Beene Brothers

Beene Brothers

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Location
Mansfield, TX
I've been talking with the folk at Megarevo and have the files to do the update but I think my computer and the megarevo aren't talking. It looks like when I plug the computer into the USB-c of the Megarevo I should get a COM port generated at the computer. But nothing comes up. In the update software it wants me to choose which com port and then hit upgrade.

I will ask them as well but figured if nothing else I can update the thread with what they say. Anyone upgraded the software on the Megarevo or EG4 8k hybrid yet?

Having an issue where mppt 3/4 under produce by 10x in cloudy weather compared to mppt1/2. They do fine in sunny weather.

Edit: Added upgrade files, after getting a data usb cord instead of one made for charging only it worked great. Doh! Not taking responsibility for you bricking an inverter due to these files. You can always ask Megarevo directly if you want to get them straight from the source.


Nice features I've noticed:

1. Can change the CT Ratio. I had put some 2500:1 CT's in instead of the original 1000:1. Now I can change the ratio to match. Possibly this could be used to adjust how much to zero out the meter? I'll have to play around with it.


Thanks!
 
Last edited:
Fourthbean said:
There is a possibility the USB cords I'm using are charge-only instead of being data as well. I have a cord at the warehouse I'll bring back tomorrow and try that.
Click to expand...
Would be interesting to see if the firmware update fixes your issue. I'm looking into these inverters for another project....Megarevo/BlueSun/EG4 8k which are essentially the same hardware for the most part.
 
Fourthbean said:
I was able to get my inverter updated. No issue following the directions after getting a data usb cord. I uploaded them to my website and put the link in my original post if you need them.
Click to expand...
Awesome. So, did the firmware upgrade fix the issue you were experiencing?
 
These are my firmware versions, but don't have a generator setup section, yet have a version number higher than yours??? I bought the 8k Dec 31st and received a week later. I've got PV and grid hooked up, and anti-reverse enabled. Yesterday, after changing grid and discharge power percent from 100 to 50, looking to get rid of the constant charge/discharge cycling, I found it was feeding the grid for a half hour before I shut it down. I changed the settings back to 100 and am back to where I was,


PXL_20230112_184412377.jpg
 
Fourthbean said:
I've been talking with the folk at Megarevo and have the files to do the update.
1. Can change the CT Ratio. I had put some 2500:1 CT's in instead of the original 1000:1. Now I can change the ratio to match. Possibly this could be used to adjust how much to zero out the meter? I'll have to play around with it.
Click to expand...
I have compared your version of the firmware with the one mentioned here:
diysolarforum.com

Megarevo RxLNA Discussion

What were the errors?
diysolarforum.com diysolarforum.com
The HybridInverter8KSNA_v1.4.13.B03D06.out is exactly the same (checked with MD5SUM)

The .AXF file on the link I mentioned above seems to be newer:

Different size:

3221692 hybrid_app_8K_V20.axf
Last modification: 12/09/22 16:08 (4:08PM)
md5sum: ffbbe0f988c3afc1203f40d80b4baa2b

vs yours

3221628 hybrid_app_8K_V20_20221208_2.axf
Last modification: 12/09/22 09:17 AM
md5sum: 60cb9c1636413586068ef9a0aab06a51
 
Last edited:
It seems the no-reverse peak shift mode now aims for zero export instead of 100W import. Which I appreciate! I didn't see a setting to change this though, which would be a step better.

There is a new setting, something about home loads. With it on I now see loads in Solar-Assistant on the graph according to how much the inverter is putting out or CT is seeing. Haven't nailed that down exactly. Nice as I have a more complete picture. Before I had to use Sense in addition to solar-assistant to see what the house was using vs. what my inverter was supplying.

Blue is new for me. In this photo you can see in yellow the PV I generated for the day. In blue is what power I used during the day, and red is what came from or went to the grid. At the moment the inverter is in off hours so I'm just pulling power straight from the grid. Battery shows that it's discharging since I have one battery with a Seplos that is being monitored here and a couple others with ANT BMS's, so power is probably flowing between batteries: 1676255495297.png
 
Shwetty said:
These are my firmware versions, but don't have a generator setup section, yet have a version number higher than yours??? I bought the 8k Dec 31st and received a week later. I've got PV and grid hooked up, and anti-reverse enabled. Yesterday, after changing grid and discharge power percent from 100 to 50, looking to get rid of the constant charge/discharge cycling, I found it was feeding the grid for a half hour before I shut it down. I changed the settings back to 100 and am back to where I was,


View attachment 134470
Click to expand...
OK so this is interesting. Here are my version numbers after updating. The 1.03.09 is from the factory and 1.03.06 is what I updated to this last week. It is definitely a newer version based on me having the parallel options now along with other settings. Don't know how they are versioning their software.
 

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Ok and back to the original reason to update firmware. It does appear to have worked as my output on cloudy days is similar from MPPT 1 to MPPT 4! You'll see that during this troubleshooting process I added MPPT 3 panels into MPPT 2 hence the flatline on MPPT 3. Hoping this helps significantly on those cloudy days where I need all I can get!

1676569659036.png
 
I am on OLD firmware and I see the same problem you described. I even tried moving strings between inverters to see if it was the inverter or a bad panel. Here's the strange part, the low output matches mppt with 2 in parallel! I didn't think it could be firmware!
 
Just to add context to my situation. Look at these, I thought my HA parameters were wrong. All strings are the same, and pointed in same direction on the same roof pitch.

mppt.png

This is after I rearranged so I could monitor the 'situation' easier.

MPPT.jpg

This one has an "outlier" but I think it was just an update issue when I took the screen shot.

unnamed.jpg

These values are low for a string, but as you said, it only seemed to happen on low production days. When the sun is shining, this is not an issue.
 
Last edited:
NCSolarGarage said:
Just to add context to my situation. Look at these, I thought my HA parameters were wrong. All strings are the same, and pointed in same direction on the same roof pitch.

View attachment 135131

This is after I rearranged so I could monitor the 'situation' easier.

View attachment 135132

These values are low for a string, but as you said, it only seemed to happen on low production days. When the sun is shining, this is not an issue.
Click to expand...
Yep that looks just like what I was running into! Thankfully it seems they fixed it in a more recent firmware update.
 
Beene Brothers said:
Ok and back to the original reason to update firmware. It does appear to have worked as my output on cloudy days is similar from MPPT 1 to MPPT 4! You'll see that during this troubleshooting process I added MPPT 3 panels into MPPT 2 hence the flatline on MPPT 3. Hoping this helps significantly on those cloudy days where I need all I can get!
Click to expand...
Thank you! I had a clear "aha" moment.
I have different sets of panels hooked up to PV2 & PV3 where 3 was the higher powered group.
When I just hooked PV3 up, I was only getting 50% of the expected performance (relative DC Watt compared to PV2)
At some point I updated the firmware and I never realized that firmware fixed that.
Since my arrays are flat, I thought the angle of sun improved (over a month) and offered more power!

Old firmware:
Screenshot from 2023-02-16 13-45-04.png
vs new firmware

Screenshot from 2023-02-16 13-43-14.png
 
fromport said:
Thank you! I had a clear "aha" moment.
I have different sets of panels hooked up to PV2 & PV3 where 3 was the higher powered group.
When I just hooked PV3 up, I was only getting 50% of the expected performance (relative DC Watt compared to PV2)
At some point I updated the firmware and I never realized that firmware fixed that.
Since my arrays are flat, I thought the angle of sun improved (over a month) and offered more power!

Old firmware:
View attachment 135175
vs new firmware

View attachment 135176
Click to expand...
Pretty choppy for both before the update too, was that a cloudy day or just rotten firmware you think?
 
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