Megarevo RxLNA Discussion

My first guess would be those two data points were gathered at slightly different times on a partly cloudy day. Do you find its consistently inconsistent?

Beene Brothers said:

My first guess would be those two data points were gathered at slightly different times on a partly cloudy day. Do you find its consistently inconsistent?

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Previous screenshots were taken at same time in the app.

Doesn't match most of the time. I just assume the inverter is limiting the available PV input for some reason that I don't understand?

Here's it is again just now... Where's the other 500w of Pv going?

@Markus_SignatureSolar ... Do you have any ideas for the difference?

The app is being worked on at the moment. They are trying to fix several things. This is probably affecting the readings you get

Markus_SignatureSolar said:

The app is being worked on at the moment. They are trying to fix several things. This is probably affecting the readings you get

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Just to confirm... Those 2 readings should match up then? (Total of PV's 1-4 and "Total DC Input Power")

Mpgrimm2 said:

Just to confirm... Those 2 readings should match up then? (Total of PV's 1-4 and "Total DC Input Power")

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I may have missed some posts above, I apologize. But have you verified you have the latest firmware on your wifi dongle? I posted earlier in this thread that there is more data available with the newer firmware, but I'm not sure if it would affect the accuracy of those numbers. I do know that the polling is slow, and it could be a result of the slow polling in changing shade conditions. I just checked my inverter (sun is low here) and those numbers are off by a few KW, but not as far as yours.

NCSolarGarage said:

I may have missed some posts above, I apologize. But have you verified you have the latest firmware on your wifi dongle? I posted earlier in this thread that there is more data available with the newer firmware, but I'm not sure if it would affect the accuracy of those numbers. I do know that the polling is slow, and it could be a result of the slow polling in changing shade conditions. I just checked my inverter (sun is low here) and those numbers are off by a few KW, but not as far as yours.

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I never thought about the fw on the dongle... How do you check it and how to update it? Not sure I have any instructions/info aside from the lines page or two in the EG4 manual

In the solarman interface, there is 'inverter' and 'logger' under the 'devices' tab. Click on logger tab, then your logger for the parameters. I don't know what the latest is, but 1.24 is when I noticed the expanded information.

NCSolarGarage said:

In the solarman interface, there is 'inverter' and 'logger' under the 'devices' tab. Click on logger tab, then your logger for the parameters. I don't know what the latest is, but 1.24 is when I noticed the expanded information.

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Here's what we've got... Not sure if I have v1.24 or v1.1.00 ?

Yeah, that is what i was referring to the _1.24.

Mpgrimm2 said:

Anyone willing to clarify what's I see via the monitoring app as to why realtime graphic shows 540w of solar production ... But the device statistics at the same time shows 1110w of combined PV input?
Why the difference? Where the rest going?
View attachment 155947

View attachment 155948

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@John4178 ... Found this in another thread ...

wattmatters said:

Do you have enough load? Or enough MPPT capacity?

MPPT controllers will only draw from PV based on available load. If there is only 2700 W of load (battery charge capacity + loads) then that's all the system will generate.

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Thanks @wattmatters for the info... Seems to help explain what I thought may be going on.

Here's a roll up/update of everything ...

Seems to finally be dialed in well on Dad's 8k setup (v22 fw) ...

Our EG4-8KEXP-240 (MegaRevo R8KLNA) Hybrid Inverter & EG4 LP4 Battery/PV Install
.

I acquired an RKLNA a few weeks ago and spent many hours reading through this and related threads to get the settings dialed in. My latest pressing issue is that the inverter seems to always want to charge the batteries, even past 100% and triggering their over-volt protection! Here are the specifics of my system:

• 4kwp of PV, 2 x 5kwh wall-mount batteries (Sungoldpower SG48100M) with BMS connected to inverter via CAN
• Main goals are backup during power outages and peak shaving. I have net metering and want to sell to the grid.
• Megarevo connected to a subpanel with a separate critical loads panel connected to Load 1. CTs on wires between inverter and subpanel breaker with arrows pointing towards grid
• Firmware v23 with the Advanced Mode menu
• Solar Assistant connected to data logger port (replacing wifi dongle)

As for settings, I've tried Self Consume and Peak Shift work modes, but so far they don't seem to ever discharge more than 20-30w from battery. That's only when I disable Grid Charge in Advanced Mode. Also, I've tried Sell First and SFC SellEn and I haven't noticed the difference between them. I have DOD set to the default 80%. If I enable TOU, I am able to get it to back feed up to 8kw from the battery, but that doesn't seem like the best solution. My understanding of Self Consume is that when solar does not meet the load demand, it should pull from battery and grid, right? It should definitely not continue to charge from grid all the time!

Also, something annoying that I've noticed is that the reported PV output is usually too high. I noticed this when I first hooked up PV with no loads behind it--the power output measured with an Emporia Vue CT and a clamp meter was 200-400w lower than what the MR showed. The discrepancy was the worst at lower current values.

Thanks in advance for any input you can provide on this issue (and many more to come, I'm sure!)

There is a new firmware released for the EG4 8k inverter, the firmware will be released on the EG4 website soon for download but I have linked it below as well as the updated manual. The ZIP file contains the new firmware, software, and a change log. If you have any questions or concerns please email support@eg4electronics.com and we will be more than happy to assist you.

Thread 'EG4 8k firmware update 09.19.23'
https://diysolarforum.com/threads/eg4-8k-firmware-update-09-19-23.69518/

Hey guys

Is it normal for the inverter fan to always be on? I'm concerned about the durability of those fans.
Not always are in high speed but always on.

Is anyone cleaning the fan in a frequency basis?

I have been running 1.5 years. I would venture to say that at some point the fans will need replaced. I assume, or hope, that by then to upgrade. I have yet to clean them. I think it would be a good idea to clean once a year, but that would also depend on the conditions where the inverter is mounted. This winter I will pull cover off and inspect.

JADG79 said:

Hey guys

Is it normal for the inverter fan to always be on? I'm concerned about the durability of those fans.
Not always are in high speed but always on.

Is anyone cleaning the fan in a frequency basis?

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I've only had mine for a couple of months, but I share your concern about the fans being on whenever the inverter is active. I've been putting the inverter in standby most nights by switching the battery comms to a port that's not connected. The primary reason for doing this is to reduce idle load and the lack of fan noise is a nice bonus.

I have upgraded my MR8K to the latest firmware that SS has announced for their EG4 labeled MR.
The software is clearly improved over my previous version.
Unfortunately the 1.5 manual does not have the same menu options as the 09.19.23 firmware release.
I documented the manual options that this version does have.
I replied to the original thread of the software release here: https://diysolarforum.com/threads/eg4-8k-firmware-update-09-19-23.69518/
I am currently experimenting with grid charging and TOU (Time Of Use) settings since there isn't an example available afaik.

nunit said:

Also, something annoying that I've noticed is that the reported PV output is usually too high. I noticed this when I first hooked up PV with no loads behind it--the power output measured with an Emporia Vue CT and a clamp meter was 200-400w lower than what the MR showed. The discrepancy was the worst at lower current values.

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Update on the inaccurate PV current readings: I started recording some data and put together this graph showing the discrepancy between what the inverter reported and what I measured.

At the low end (between 0-1.2a), the reported numbers are about 50% off my measured values. The discrepancy tapers off starting around 2a, and at 3.5, it goes to 0. Interestingly, at higher current values, I measure slightly higher than what's reported. I sampled at least 2-3 readings for each data point plotted. Also, the the voltage readings I took have always been very close to the reported values, so I now assume they're always correct.

I like to track PV production metrics (AC kwh) over time, so this throws off my metrics quite a bit. I understand that it's reporting DC power, so there will be some loss in the AC power output, but that should be on the order of 5%, no? I'm currently applying a fudge factor of 0.85 when I record my monthly PV kwh production metrics, so it would be nice to get a more accurate reporting of PV production in AC kwh.

I mentioned this to Megarevo Engineering via WhatsApp, including the graph above and they quickly dismissed it as "sampling error and linearity error". I'm hoping that some of you have noticed this issue with reported PV current/power. For example, if you have the CTs installed on the grid wires per the manual, then have you noticed a discrepancy in the PV power and grid output? This would be especially apparent during lower PV production periods (and when there's no charging/discharging of the batteries, of course). In the early morning, I often will see 600w of PV but 0 on the grid output. Better yet, if you have a clamp meter and can take some DC current measurements, I'd love to know if you're seeing similar results.

I buy the Megarevo to GSL and the 10kw battery from them too. I have the issue that the battery is exporting to the grid when reach 100% then start charging again in 96%. There is a setting in the BMS for Inter- SOC Threshold(%) at 96 to start charging again. But I don’t know why the BMS or the inverter is exporting from the battery. If I change the Battery Type to Lead Acid the system doesn’t export from the battery.

I have net metering so my settings are to sell. My TOU is disabled in the Adv setting to avoid that.

Any idea how to resolve the issue?

NCSolarGarage said:

With no grid, just battery and PV connected, when sun is not sufficient to power the inverter, the relays click and the screen turns off. The screen will then turn back on, show 'initializing' and seem operational. Then if I see PV get to roughly 300watts, the relays will click, the screen will turn off, say initializing, etc. Its almost like the inverter is switching its power source between battery/pv or something. Not sure. Perhaps I have some settings wrong.

I am running in self-consume, but I am unsure what DISC-POWER means, perhaps that is something to do with it? PV-POWER is set to 100%

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Hi there,

Did you solve this problem? and if so how did you fix it?

I am having the exact same issue.