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Megarevo RxLNA Discussion

Yes, It enables parallel function which I was "promised" when I bought my inverters from GSL. Well, happy to say they have delivered.

Firmware 2.04.11
 
You're supposed to be able to update through the solarman website, but there are never updates posted there on my update page. GSL is able to push the update if you provide your ID#.
 
NCSolarGarage said:
You're supposed to be able to update through the solarman website, but there are never updates posted there on my update page. GSL is able to push the update if you provide your ID#.
Click to expand...
So you updated via Solarman? If so how did it go and did it reboot or how do you get or keep the router powered if it's connected to the inverter?
 
jsmetalcraft said:
So you updated via Solarman? If so how did it go and did it reboot or how do you get or keep the router powered if it's connected to the inverter?
Click to expand...
Never thru Solarman, I have yet to see an update on there. GSL did push an update for me, but it failed because I didn't have grid backup
 
flygeek said:
I happened to be in the basement around 5:30am this morning and I noticed that the unit rebooted about six times in a row for the testing. The power didn't go out to any of the panels (or if it did, it was very quick).
Click to expand...
The 5:30 am test will not effect your load if you are grid connected.
 
May have been asked. Last time I read through the thread I didn’t have a Megarevo on the wall.

Now I’ve got an 8k mounted with a 100ah battery, for now. I set the charge current to 50a per the battery specification but I don’t see a place for discharge limit. In self consumption mode it will trip the bms trying to pull too many watts to push to the house.

I suspect a seplos bms will fix this. Or at least a 200a rated battery. But has anyone seen a setting for limiting output from battery without limiting the solar?

My main purpose right now is peak shifting.

Thanks!
 
Fourthbean said:
May have been asked. Last time I read through the thread I didn’t have a Megarevo on the wall.

Now I’ve got an 8k mounted with a 100ah battery, for now. I set the charge current to 50a per the battery specification but I don’t see a place for discharge limit. In self consumption mode it will trip the bms trying to pull too many watts to push to the house.

I suspect a seplos bms will fix this. Or at least a 200a rated battery. But has anyone seen a setting for limiting output from battery without limiting the solar?

My main purpose right now is peak shifting.

Thanks!
Click to expand...
I think the megarevo, when using Lithium, uses BMS programming for discharge. I know that what ever I have set on Seplos it reads on the inverter screen. Same with charge voltage. I have 140 amps and never get that high. Look through the lead acid settings where there are many more settings, I can't remember if there is discharge setting. You may have to run in Lead acid mode.
 
jsmetalcraft said:
I think the megarevo, when using Lithium, uses BMS programming for discharge. I know that what ever I have set on Seplos it reads on the inverter screen. Same with charge voltage. I have 140 amps and never get that high. Look through the lead acid settings where there are many more settings, I can't remember if there is discharge setting. You may have to run in Lead acid mode.
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I may have forgotten to say. Yes I’m in lead acid mode right now, just couldn’t find the max discharge setting. Found the max charge setting. Of course I had it set to 25a and it was charging at 20a but that’s a separate issue. Ooof. I knew I was getting into a mess buying this thing. Just wish it had better output telling you what was going on in its head.
 
Has anyone seen the ability to charge the battery from the grid for peak shift or do I have to charge from pv? With it in “charge” mode overnight it doesn’t charge. During the day when it’s in “discharge” it wants to just charge, doesn’t seem to want to charge at the same time as supply Solar to the grid for zeroing out the meter. Ran out of time to play with it today.

I have it setup so that with a charged battery and the CT’s connected it will discharge the battery and leave 100-300w coming from the grid. Which sounds right. But when I throw Solar into the mix it was just charging the battery but not supplying to the grid.

Right now I don’t have anything on the eps. Just trying to use it for zeroing out the meter 5am to 8pm.
 
Fourthbean said:
Has anyone seen the ability to charge the battery from the grid for peak shift or do I have to charge from pv? With it in “charge” mode overnight it doesn’t charge. During the day when it’s in “discharge” it wants to just charge, doesn’t seem to want to charge at the same time as supply Solar to the grid for zeroing out the meter. Ran out of time to play with it today.

I have it setup so that with a charged battery and the CT’s connected it will discharge the battery and leave 100-300w coming from the grid. Which sounds right. But when I throw Solar into the mix it was just charging the battery but not supplying to the grid.

Right now I don’t have anything on the eps. Just trying to use it for zeroing out the meter 5am to 8pm.
Click to expand...
I have not ran in Peak Shift mode.

2. When grid, battery is available (pv disconnected)
A. On charge time, grid will charge battery.

Maybe your time settings are not set right? I know when I first got the unit, I played with it some and trying to figure out the time settings was a bit daunting. I don't have use for it so never mastered it and am not much help.
 
jsmetalcraft said:
I have not ran in Peak Shift mode.

2. When grid, battery is available (pv disconnected)
A. On charge time, grid will charge battery.

Maybe your time settings are not set right? I know when I first got the unit, I played with it some and trying to figure out the time settings was a bit daunting. I don't have use for it so never mastered it and am not much help.
Click to expand...
Funny. Just checked and sure enough it’s charging now that it’s after 8pm…

Guess I’ll see how it runs tomorrow.

Thanks!
 
flygeek said:
For your Megarevo owners out there (I just got my R8KLNA last week):

I was able to get the BMS protocol communication structure. Here is a link to the Google Sheet that I created: https://docs.google.com/spreadsheets/d/10kNWjWOMPvYuVP-sE-3YHWA0HRo4d2jKk1wABqbj9J4/edit?usp=sharing

I had to translate some Mandarin, but it seems pretty straightforward. I've also attached a PDF of the Excel sheet too.

Apparently, the unit firmware is also supposed to update automatically via the Solarman logger interface (WiFi plug-in adapter).

Thanks to @minerva for pointing out the battery config has to be Lead-Acid until the BMS protocol is figured out. Coming from the technology world, it's a little horrifying how archaic and non-standard the communication protocols are (it reminds me of electronics class twenty five years ago).

Will close my other topic to avoid confusion.
Click to expand...
So glad to know I'm not the only one who thinks their communication protocols are archaic. I mentioned this to the support staff and thought I would be BBQd at the stake!
 
I noticed on the latest firmware, Lead-Acid mode now allows charge voltage up to 58v and OVP to 60v, this was previously 56v/58v I believe. Battery End Volt is now down to 40v, from 44v previously.
 
NCSolarGarage said:
I noticed on the latest firmware, Lead-Acid mode now allows charge voltage up to 58v and OVP to 60v, this was previously 56v/58v I believe. Battery End Volt is now down to 40v, from 44v previously.
Click to expand...
I'm glad to see they widened that, the original parameters looked a little restrictive for some applications.
 
Have you noticed the new behavior of finding the MPP in the beginning and at the end of the day ?

Old:
mppt_old.png
Mppt input voltage is kept high till enough amps are being produced and than a small drop is allowed.

New:
mppt_new.png
As soon as the sun comes up, the voltage goes up 300+ volt (in my case).
At some point the voltage on the mppt inputs is lowered to 85 volt and pulling more amps till at some point they allow the voltage go up .
Mirrored behavior at the end of the day.
Voltage drops to 85 volt again till sunset.

I found it interesting to see the behavior.
I went from old:
ARM V1.03.03 DSP V0.00.00
to NEW:
ARM: V1.03.11 DSP V2.04.11
 
Last edited:
I think it has been doing that for the past two firmware versions, at least on my unit. For me, its 85v until it reaches 1A (or roughly 100w), then it allows V to increase. At the end of the day opposite, it drops to 85v once its down to approx 100w, then lets the amps taper to zero.

I only have 1 string hooked up so far, approx 3000watts rated.
 
NCSolarGarage said:
I think it has been doing that for the past two firmware versions, at least on my unit. For me, its 85v until it reaches 1A (or roughly 100w), then it allows V to increase. At the end of the day opposite, it drops to 85v once its down to approx 100w, then lets the amps taper to zero.

I only have 1 string hooked up so far, approx 3000watts rated.
Click to expand...
I got my inverter in January of this year and it came with the ancient firmware.
I was just playing with it but it stopped using one of my MPPT inputs suddenly.
Even though there was voltage/power available on the input, I had to flip the DC switch off, wait a few seconds and turn it on to activate the second string.
This is the day I figured that out:
Screenshot from 2022-07-22 06-37-58.png
After that day I had to do that routine every morning in order to get both mppt inputs to work again.
That was my trigger to install windows on a VM with the sole purpose to do a firmware upgrade :-(
Next time I order something, i will ask them to upgrade to the latest firmware in the factory.
 
I just realized or noticed that the self test thing in the morning is finally disabled even hooked to grid. Not sure if it took place with firmware update, or in reading the manual from GSI it says you must hit the enter key before the new setting is saved. I might have been hitting the back button instead. Just something to keep in mind. This is in reference to the setting to disable it.

Over all the unit has been fairly stable over the past few weeks. Only one bus over vol. Seems to happen when there is a very low load (500 watts?) and in afternoons when there is plenty of PV available. Been hot so the mini split runs from 10am to 8pm pulling 900-1500 watts all day so might be what is solving over vol warnings.
 
B94D0752-C4C8-4D0E-95BB-A8F84A10B3B6.png

I was having trouble with a single 5kwh battery. Yesterday upgraded to 10kwh and the results are fantastic! Batteries charged overnight on cheap power and I’ve been running all day at a slight deficit supplemented by the 8.3kw of rooftop solar. Only 2kw connected to this inverter. The rest is on a purely grid tie inverter. You can see in my sense monitoring my solar/battery is following my consumption since 5am. I may not have enough Solar to get me all the way to 8pm when cheap power starts but that will be the next step.

Very cool!
 

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MNRosado said:
I am hounding them about this issue. This is a critical fault, and it should be a priority fix. But nothing yet. I am running a Deye (1.5 yrs) and a Sol-ark 8k (2yrs) neither have ever shut down.
Click to expand...
You can disable this. I have a GSL Hybrid Inverter, which seems to be the same with only a couple changes. Mine was also doing this test everymorning at 6am and shutting down the whole system while performing the test. to turn it off:

SETTINGS - 5. RUN SETTINGS - 9. ACTIVE REP. - 6. Lack Current - Disable 7. INSULATION D - DISABLE
 
MNRosado said:
You, know Flygeek something similar happened to me but with the PV not charging. PV would not begin charging my LiFePO4, unit was in Lead acid mode since, at the time there was no Canbus on my BMS.. Finally i switch from lead acid to Lithium waited a few seconds and switch back to lead acid and all of a sudden it started charging with PV. Been working fine ever since. I guest the software is bugging and has difficulties releasing the last command.
Click to expand...
I had to switch my battery setting from Lithium to Lead Acid prior to the firmware update. The firmware update allowed me to be able to use Lithium mode and configure my 4 lithium batteries successfully with the Megarevo.
 
fromport said:
From what I understand, each mppt is converted to some "DC middle bus" and from there the AC is generated.
If that bus has a sudden increase of available power, it seems to need to "think about it".
Could it be that at 5:30am it was just enabling a new string ?
Click to expand...
Here is an explanation from the manufacturer about why this "test" happens at early in the morning:

In the morning, when the PV voltage is low, the inverter will perform an insulation test when the PV voltage is detected. When the insulation test is performed, the inverter will stop inverting, so the power will be cut off for one minute in the morning.
If there is an AC power grid, the inverter will switch to bypass power supply during insulation detection, and the load will not be powered off.
 
Here is something I noticed today. When I last updated I got these valleys where the PV would drop and spike right back up. I turned down the charge amps to 65 and that seem to minimize the effect. I haven't seen these issue for two weeks. This morning I was playing around and enabled the insulation test. This after noon I noticed the drops...well until I disabled it.

From 14:04 insulation was enabled. At 14:18 the peak was me turning on the lights and disabling it. As you can see from that time on I did not have any issues.

Reason I enabled it was sometimes I have issue with inverter picking up and charging battery when I run it down to 10% SOC which is where i have is set at when grid is available. 90% DOD grid and 95% DOD EPS. I change remaining capacity on BMS and it instantly goes into using full available PV to supply loads and reaming charge battery.


Screenshot 2022-07-31 at 14-32-26 IotaWatt Graph.png
 
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