diy solar

diy solar

Megarevo RxLNA Discussion

NCSolarGarage said:
My units both use USB-C. I installed the update software, then plugged in the USB cable, and the com port shows up in my device manager. I use that com port in the drop down, and it works fine.
Click to expand...

First time I did that, my windows recognized the new USB device and fetched a driver from the internet and I got a message that the "usb serial port is now usable" (or something similar)
At that point COM3 was selectable and it seemed to work [TM]
NCSolarGarage said:
The only catch is that you need the .axf and .out files in the root directory of your drive or it won't see them.
Click to expand...
I had in directory few levels deep. Directory should not contain any special characters (like the chinese subdir it is extracted to) and NO SPACES.
But it works perfectly fine several levels deep ;-)

I am using a VM windows10 on a debian linux machine with the USB device forwarded to the VM.
 
DOD. is % you want your battery to discharge to. Grid is when there is grid connected. EPS is when grid is disconnected. return is where it will start to use the battery again after some charge has occurred.

My settings are 90% on grid and 95% on EPS. You may or may not want to discharge your battery that low. 80% would limit cell degradation if that is a concern. I think my return is 85%. So lets say you discharged 90% over night. The next morning you get an hour or two of charge and the battery is now at 80% DOD or 20% SOC, and you get a load greater then what PV can supply. The balance can now be used from the battery instead of grid.

Run settings I have yet to fully understand. The GSI manual mentions them but no instructions. I had issues when using what I think was react mode. Changed to PF mode and seemed to not have same issues. But take that with grain of salt.
 
I tried a different W10 machine and it worked o_O

It would be nice if return is not an absolute value, but relative to the grid status. For example:

grid discharge = 80
off grid discharge = 95
return = 20

grid discharges to 80, then charges to 60 (40 SOC) before discharging again
off grid discharges to 95, then charges to 75 (25 SOC) before discharging

I just set mine up like this, so we'll find out soon if that's how it works!
 
cmack said:
I tried a different W10 machine and it worked o_O

It would be nice if return is not an absolute value, but relative to the grid status. For example:

grid discharge = 80
off grid discharge = 95
return = 20

grid discharges to 80, then charges to 60 (40 SOC) before discharging again
off grid discharges to 95, then charges to 75 (25 SOC) before discharging

I just set mine up like this, so we'll find out soon if that's how it works!
Click to expand...
Return = 20% DOD would be 80% SOC. So if grid discharged to 80% DOD the battery would not return to discharge until it reached 80% SOC.

Should be 80% DOD with return set at 60% DOD if you want to have discharge set to activate at 40% SOC
 
After the firmware update I am still showing 0 load on GRID, even when it's definitely being used. Anyone else having this issue?

In this screenshot you can see 749 pv, 1610 charge, 268 consumption, meaning ~ 1.1 KW should be coming from grid (assuming I understand this correctly)
 

Attachments

  • flow.png
    flow.png
    37.3 KB · Views: 14
cmack said:
After the firmware update I am still showing 0 load on GRID, even when it's definitely being used. Anyone else having this issue?

In this screenshot you can see 749 pv, 1610 charge, 268 consumption, meaning ~ 1.1 KW should be coming from grid (assuming I understand this correctly)
Click to expand...
Solarman is lacking or more then likely the Megarevo does not send that data. Mine shows same thing. I think the CT that measures grid is inside the unit so only reading what is on the grid connection, not from the CT's.

Here is mine this morning. Battery reached the limit of DOD, so only a little bit of PV, and rest is from grid to the EPS panel.

Screenshot 2022-08-04 at 07-43-13 SOLARMAN Business.png
 
The Megarevo display also shows 0A always. So it doesn't have the right data in the first place as far as I can tell.

What software is your screenshot from?
 
@flygeek Have you made anymore progress on the modbus protocol? I've just started playing around with scanning the registers using python and umodbus with the PVSolarman5 script. It seems to be easier to access via IP & Serial# than making a cable. As you've guided me, I've found the battery info in the 8850 area, notable SOH at 8856, and battery voltage at 8857, etc. I'd like to get these integrated into something like home assistant or ideally just into graphana. But its going to take quite a while to match all the registers by comparing the returned data vs what the inverter is reporting on screen. Have you found a better source than the GOODWE document?

Looks like daily production at 12627 and daily consumption at 12631
 
Last edited:
I just installed HASS today, and I've been playing around all day trying to pull the numbers from the WIFI stick into the interface. I have found a few parameters, but today is my first day ever with Home Assistant, Python, Modbus, etc. LOL. Its been a looooong day. :ROFLMAO:
 
Is it just me or did the upgrade change the way self-consumption mode works?? It should prioritize PV, then battery, then grid. For me, it doesn't discharge the battery unless I shut off the grid. Before the upgrade this was working properly :/

Grid DOD: 80
Off Grid DOD: 95
Return: 20

ChargeV: 57.6
EndV: 44.8
OVP: 59.2

In the screenshot below battery discharges to 25% by about 8:30am then PV takes over the loads for a while and battery charges. At around 14:30 the battery is charged and PV is not sufficient to power loads, but battery is not discharged. We see a bit of discharge around 18:30 but this stops by 21:30. Next day (this morning) shows full SOC, insufficient PV, and still no battery discharge.

Before the upgrade my battery would discharge as expected, after the upgrade it behaves like this. Anyone have ideas why?
 

Attachments

  • grap2.png
    grap2.png
    41.2 KB · Views: 5
  • grap.png
    grap.png
    76.9 KB · Views: 5
NCSolarGarage said:
I just installed HASS today, and I've been playing around all day trying to pull the numbers from the WIFI stick into the interface. I have found a few parameters, but today is my first day ever with Home Assistant, Python, Modbus, etc. LOL. Its been a looooong day. :ROFLMAO:
Click to expand...
let me know when you make progress with that. i would be interested in that as well since I have HA running as well ;-)
Screenshot from 2022-08-04 20-24-23.png
 
cmack said:
Grid DOD: 80
Off Grid DOD: 95
Return: 20
Click to expand...

I have not tested this yet, but it is my understanding that these settings mean your battery will discharge to 20% SOC while using grid, but NOT allow battery supplement again until the battery recharges to 80% SOC.

Try changing Return to something like 75% DOD.
 
fromport said:
let me know when you make progress with that. i would be interested in that as well since I have HA running as well ;-)
Click to expand...

I managed to get it working last night. Unfortunately my wifi went down in the shop this am. I'm using P2P dish to get signal from my house, then a wifi router within. I won't be home til this evening to see why the connection went down. Sometimes when power goes out, the wifi doens't reconnect even tho it gets signal thru the P2P.

With that said, I have a few parameters updating on a 30 second interval.

1659706929446.png
 
NCSolarGarage said:
I have not tested this yet, but it is my understanding that these settings mean your battery will discharge to 20% SOC while using grid, but NOT allow battery supplement again until the battery recharges to 80% SOC.

Try changing Return to something like 75% DOD.
Click to expand...
The battery charges all the way to 100 and still doesn't discharge so I don't think this will solve my issue?
 
NCSolarGarage said:
I managed to get it working last night. Unfortunately my wifi went down in the shop this am. I'm using P2P dish to get signal from my house, then a wifi router within. I won't be home til this evening to see why the connection went down. Sometimes when power goes out, the wifi doens't reconnect even tho it gets signal thru the P2P.

With that said, I have a few parameters updating on a 30 second interval.

View attachment 105499
Click to expand...
I managed to get the custom integration of solarman included.
I was able to configure all that
Screenshot from 2022-08-05 08-56-18.png
But it is not showing up in my overview :-(
I really have love/hate relation ship with HA
 
You must log in or register to reply here.

Similar threads

Beene Brothers
Megarevo 8K Firmware Update
7 8 9
Replies
218
Views
17K
WrenchLight
W
D
EG4 8k/megarevo Hybrid inverter zero export
2
Replies
30
Views
4K
Mpgrimm2
Mpgrimm2
R
Blue Sun BSE6KL1 to Megarevo R6KL1
Replies
7
Views
668
Pale1290
P
wingedlizard
EG4 6000 bypass mode
Replies
8
Views
290
EG4TechSolutionsTeam
EG4TechSolutionsTeam
T
SOROTEC iHESS 3.6KW not reading CT-data from clamp
Replies
0
Views
163
Tkourou
T

diy solar

diy solar
Back
Top