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Megarevo RxLNA Discussion

JohnZEBSolar said:
I shut down pv, and battery, then do upgrade with only grid connect. My PV drops out then bounces very low over the next few hours/days
Click to expand...
I like to leave grid off, and upgrade with battery. Restart with battery, pv then grid. I am not so sure even turning the EPS breaker off unit it boot wouldn't be a bad idea. Then give it time to adjust as each source of power is turned on. The MR is touchy, cranky when trying to get everything going back on line. Sometimes takes a try or two. Why I hate to touch the thing.
 
I just updated the firmware. Seems to have gone with no issues. Booted up and no errors.

Turned everything off including EPS and grid breakers
Plugged in USB and booted with battery.
Updated and when finished hit the reboot button.
Turned battery off, let MR discharge, and then turned on battery
Once booted I turned on PV until I heard a click, then EPS breaker, and finally grid.

Only issue, if it becomes one, is that the draw from grid, after CT is now close to zero to feeding 7 watts into grid where before I averaged around 50-75 watts used from grid. Tried to adjust the CT ratio but no setting seemed to make a difference. I am assuming while that menu item was added it is not programmed to do anything yet. It also will not go below 1000:1. I don't like it to be so close that it feeds into the grid. Hopefully the reaction time has been improved.

I don't see anything indicating the generator function has been implemented

And final thing I noticed is that in Solarman I now have version numbers after Bootloader, CPU2, and Auxiliary.These versions we blank before
 
Hi,

I finished to install my 8kw Megarevo from GSL with a 10kwh lifepo4 GSL battery and net metering. So far so good for now.

Question

Does anyone know if there is a statistic of how many watts per day the inverter consumes or a formula that I can use to calculate that?
 
JADG79 said:
Does anyone know if there is a statistic of how many watts per day the inverter consumes or a formula that I can use to calculate that?
Click to expand...
I don't think anyone has numbers that would make sense.
If the MR just runs along the grid, I think there would not be a lot of power being used, maybe 30-50 watts.
If there is no grid and the grid is being generated from the batteries, I assume there is a much larger usage, maybe 200 watt.
Plus the load of course.
 
I keep fighting with my "peak shaving" settings.

I charged my batteries from the grid today.
I have the CT's installed, L1 CT on the L1 line, L2 CT on L2.
Arrows pointing towards the grid.

These are the settings at the LCD display:

Screenshot from 2023-01-10 17-38-10.png
This translates in my mind to: from 4PM -> 8PM it should supply all energy to the load from the battery and not from the grid.

This is what happens in real life:

Screenshot from 2023-01-10 17-42-41.png
At 4PM the unit starts to draw almost 8kW power from the batteries and converts everything to AC.
Screenshot from 2023-01-10 17-47-45.png
Screenshot from 2023-01-10 18-34-41.png

pushing 4370 Watt into the grid

I quickly switched to self-supply mode again.
But this is not what I want.
Anyone any idea what I might be doing wrong ?
 
fromport said:
Anyone any idea what I might be doing wrong ?
Click to expand...
Asked the question also to MR direct
Their reply:
You choose peak mode, it will charge according to the time you set, or discharge, you can choose self-use mode，During the day, the photovoltaic cells charge the batteries, and at night the batteries power the load
Click to expand...
So I showed them the stats of yesterday:
Screenshot from 2023-01-10 20-59-44.png
We had 10"/25 cm of rain in 30 hours (atmospheric river in southern cali)
Less than 1kWh of PV production with 6kW DC rated panels hooked up.
It was on self supply mode and we had a 2 hr power outage because of the rain but battery was already drained so had to cut energy in the house to bare minimum to make the batteries last.

So that is not an option.
Let's hope they come back with a better/different solution.
 
fromport said:
I keep fighting with my "peak shaving" settings.

I charged my batteries from the grid today.
I have the CT's installed, L1 CT on the L1 line, L2 CT on L2.
Arrows pointing towards the grid.

These are the settings at the LCD display:

View attachment 128953
This translates in my mind to: from 4PM -> 8PM it should supply all energy to the load from the battery and not from the grid.

This is what happens in real life:

View attachment 128954
At 4PM the unit starts to draw almost 8kW power from the batteries and converts everything to AC.
View attachment 128956
View attachment 128957

pushing 4370 Watt into the grid

I quickly switched to self-supply mode again.
But this is not what I want.
Anyone any idea what I might be doing wrong ?
Click to expand...
I'm fighting the same problem. As of now, all I can do is adjust the charge current to match the sun, but this obviously means on cloudy days im charging from the grid. I am trying a few things and will ask MR today. Ill report back if I find a fix
 
Interesting you guys are fighting charging from grid.

The MR has been working great since June. The other day I come in and my batteries are equalizing at 20% SOC. I assume that the charge voltage spiked for some reason. I changed to Lead acid and didn't notice any further issue. The next day I went back to Lithium and again no noticeable issue. What I have been fighting since is that when battery gets to set DOD it then charges from grid to the return setting. In the past once I reach the DOD setting the battery goes into standby until there is solar to provide a charge. I was hoping that a reboot, and while I am at it a firmware update, would return to normal. Still charging from grid even though I am in Self consume mode. Pulling my hair out why worked for months and all of a sudden want to charge from grid on it's own.
 
jsmetalcraft said:
Interesting you guys are fighting charging from grid.
Click to expand...

Not doing that, fighting full discharging INTO the grid.
My system is charging at night == lowest rate from utility.
I have 20kWh usable battery capacity.
Highest rate is from 2PM->8PM ==6 hours, 8PM->10PM = 2 hours medium rate
In my mind if the batteries were able to supply the loads during those 8 hours that would be great.
Instead: when you set the time, FANS kick in highest speed. Inverters starts to generate 8000 watt,
Whatever load my home is taking, the rest is put INTO the grid.
20/8=2.5 hours later my batteries are 100% usuable discharged.
5.5hrs to go drawing power from the grid at the high(er) rates
that makes absolutely no sense!
No buffer for power outage.

jsmetalcraft said:
The MR has been working great since June. The other day I come in and my batteries are equalizing at 20% SOC. I assume that the charge voltage spiked for some reason. I changed to Lead acid and didn't notice any further issue. The next day I went back to Lithium and again no noticeable issue. What I have been fighting since is that when battery gets to set DOD it then charges from grid to the return setting. In the past once I reach the DOD setting the battery goes into standby until there is solar to provide a charge. I was hoping that a reboot, and while I am at it a firmware update, would return to normal. Still charging from grid even though I am in Self consume mode. Pulling my hair out why worked for months and all of a sudden want to charge from grid on it's own.
Click to expand...
I don't understand what has changed.
Could you some examples with Soc in old and new situation?
 
Last edited:
I don't understand what changed either, unless hardware issue, but does not seem so.

No changes in SOC, other then we have not seen the sun much in weeks. I think last three weeks I have charged above 95% SOC three times. Once charged I can go almost two days before I reach 92% DOD. Played with it this morning with no changes. Discharges to 92% DOD and then charges with grid to 89% DOD Return setting and then discharges. Just a continuous loop.
 
Slvrsky07 said:
2.5 is a weird reading. I wouldn’t think the SOLARMAN dongle would work with less than 3.3v. Maybe measure between the ground pin and 5v pin?
Click to expand...
Sorry it took me a while. My pinout is exactly as you describe. 5v pin 1,gnd pin 4. 2.5v 2/3 to pin 4
 
JohnZEBSolar said:
I have 2 inverters (not in parallel), both are acting the same after upgrade. I believe this has happened on earlier projects, I believe it took several days to get going properly. I'm guessing you haven't had anything similar happen?
Click to expand...
I have 2 inverters, IN parallel, but I haven't seen that behavior.
 
Update: I was having issue with MR charging from grid when battery reached the Grid DOD setting. I switched to Priority mode than back to Self Consume. The issue has returned to almost normal, in that it does not start to charge 130 amps from the grid. But, I do have 1.5 amp draw from battery. It did appear it went into charge mode for 10 minutes last night. Not sure what triggered it. Anyway I can live with it for now.

So assuming that the 1.5 amp draw is idle current then the MR uses a bit more then 75 watts which would sound reasonable.
 
JohnZEBSolar said:
I'm fighting the same problem. As of now, all I can do is adjust the charge current to match the sun, but this obviously means on cloudy days im charging from the grid. I am trying a few things and will ask MR today. Ill report back if I find a fix
Click to expand...
I got this response back from MR

Screenshot from 2023-01-15 20-11-43.png

There are different ways to interpret this imo, but this is one:
It could mean that if you put setting 1-5-2 grid power from 100% -> 0% it would not feed back anything into the grid.
That is what I would want it to do.
I will try this setting in the next few days and will report. I am still in one of those atmospheric rivers so not much sunshine around here atm.
 
fromport said:
There are different ways to interpret this imo, but this is one:
It could mean that if you put setting 1-5-2 grid power from 100% -> 0% it would not feed back anything into the grid.
That is what I would want it to do.
I will try this setting in the next few days and will report. I am still in one of those atmospheric rivers so not much sunshine around here atm.
Click to expand...
So putting that setting to 0% is a bad thing [TM]
Even in self supply mode, it will not discharge the battery.
Early in the morning I set that "grid power" to 0% but kept the inverter at self-supply mode

Screenshot from 2023-01-16 21-30-12.png
PV charged the battery from 50% to 89% but the inverter kept feeding expensive GRID power to the loads instead of compensating the load with energy from the battery. At 5PM I put the value back to 100% and is started feeding the load from the battery again.

This unit would/could be such a great unit, if we only would get better software & support!
 
Last edited:
Take it for what it's worth. I played with the Grid % a little but not enough to be firm on my opinion.

Grid input % is based on the % load of the inverter. It's not linear in that it is when you reach you setting that it adds in grid to supplement the load. So with it set at 0% it would make sense that the output would be zero or near it? I need to try another setting, lets say 50% and monitor the results to confirm or other.

Here is a screen shot of the electric dryer running along with the other loads. I have mine set at 90%. It appears, that whne the MR reaches 7k watts of loads, 90% = 7.2k watts, it starts to draw from the grid to supplement the heavy load.
 

Attachments

  • Screenshot 2023-01-17 at 14-48-47 IotaWatt Graph.png
    Screenshot 2023-01-17 at 14-48-47 IotaWatt Graph.png
    63.5 KB · Views: 4
I have my Megarevo connected to the grid, self consume, net meetering and Load 1 to a subpanel, CTs are pointing to the grid in the main panel.
Grid DOD is 20% and Off Grid is 80%
Firmware ARM V1.03.12 and DSP V2.04.12

The system is exporting to the grid when battery reach 99-100% as expected but for some reason the battery is discharging at the same time as you see in the picture.

Is this is a normal behavior or there is something wrong with the setting or the firmware?


1674053861853.png

1674054073729.png
 
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