Megarevo RxLNA Discussion

[paulwebb500]

Thanks everyone for contributing to the communal knowledge of this nearly awesome and cost effective AIO!

I'm about to pull the trigger on 3x 8kw units from Alibaba. Wondering if anyone has any experience positive or negative with any retailers they would like to share? I understand with any reseller the communication and support will leave much to be desired but it see this venture possible with the community support. I don't see the additional cost of purchasing through any North American distributors to be worth it.

Hopefully I can get these running in 3 phase mode eventually, but that might be a lot to ask at this point, so for now I'm good with 2 units in split phase parallel, and a third hot/cold spare. I'm going to be setting up a standalone current/voltage monitoring system on all electrical connections so hopefully that data can help troubleshoot odd behaviors and streamline bug fixes for us all. I've got 13kW of PV already, and 30kWh LiFePo eG4 rack on the way. Completely offgrid with a dirty THD generator which I hope not to use! It seems the 10kW MR is newer, anyone get one of those units yet? I imagine they are very similar with just beefier inverting components.

To those of you with months of experience with this unit so far - would you do it again today or shell out 3-5x more for something more established with better support? Thanks and looking forward to contributing.

I've bought from these guys on Alibaba....80 x 550W panels and 2 inverters at work, and then a 4kW system for home. Found them to be trustworthy and responsive after the order.

Paul Webb

Henan Livefun Solar Technology Co., Ltd.

Export Dept. Director: Karl Xu

Tel/Wechat/Whatsapp: +86 13673324979 Skype: cnkarlxu

Email: karl@livefunsolar.com Web: www.livefunsolar.com

Add: 8148, Ruida Rd., Zhengzhou, Henan, CHINA.

 

[Stefan Watson]

Has a anyone ran these units in parallel? I currently have a system in parallel that won't work. It keeps on saying Inv over vol. From the EPS side. I am trying to run off grid. On the grid side it uses the grid and refuses to use solar, even though i set it to self consume and have anti reverse enabled

Any amount of help would be appreciated

 

[NCSolarGarage]

I'm running 2 in parallel for about a year now. I am off-grid. Are you using BMS/Lithium battery or are you set to Lead-Acid? Does the inverter batt voltage show the same voltage your physically measure at the terminals? What is your actual measured PV input voltage?

 

[Anhpt]

Does anyone know what HOME LOAD does?

see photo below to see where is home load. Load connected at grid side, behind the CT, called HOMELOAD

 

[Anhpt]

Has a anyone ran these units in parallel? I currently have a system in parallel that won't work. It keeps on saying Inv over vol. From the EPS side. I am trying to run off grid. On the grid side it uses the grid and refuses to use solar, even though i set it to self consume and have anti reverse enabled

Any amount of help would be appreciated

in paralell system, if both use common battery, so the battery have to communmicate with master inverter by CAN port, battery type set is Lithium.
if not, 1 of these inverter has error "bus over vol"

 

[X propane]

Was it ever confirmed that the Megarevo is ul listed? Certified? 1741 Sa?

Does it apply for all the units? I'm on the fence for the 10kw. My wife and I want to relocate in the next 4-5 years. Hopefully we will have enough equipment to go off grid.

Thank you for your beta testing, Eric R.

 

[fromport]

Was it ever confirmed that the Megarevo is ul listed? Certified? 1741 Sa?

Does it apply for all the units? I'm on the fence for the 10kw. My wife and I want to relocate in the next 4-5 years. Hopefully we will have enough equipment to go off grid.

Thank you for your beta testing, Eric R.

This is the cerfication I found for

Model(s): R5KLNA, R6KLNA, R7K6LNA, R8KLNA, R10KLNA

 

[X propane]

This is the cerfication I found for

Model(s): R5KLNA, R6KLNA, R7K6LNA, R8KLNA, R10KLNA

Thanks, I'm curious how your inverter is set up if you have micro's, and string inverters.
Such as the ability to peak time shift? Assuming your on grid....

 

[fromport]

Thanks, I'm curious how your inverter is set up if you have micro's, and string inverters.
Such as the ability to peak time shift? Assuming your on grid....

Currently everything is in parallel connected to the grid.
Because of the limited power of pass-through i can not hook up my micro's to the MR for ac coupling. That plus the PV connected to MR itself would overload the internal relay/wiring and trip the 40 amp breaker that connects the MR to the grid.
I am thinking of putting a transfer relay in when power goes out the micro's will get switched from grid to the generator hook up of the MR.
In my thinking, when grid fails and because of the transfer time of the relay, the micro's will go to anti-island mode, so they will wait 5 minutes before getting back online. by that time the MR will be able to freq shift to regulate the AC coupled micro's.
As soon as the grid returns, relay switches back and after 5 minutes goes back to feeding the grid at full power.
I will have to try it out manually before investing in the transfer switch.

 

[X propane]

I only have micro's IQ7's Enphase. Hmmm, now I need to bug you a little more.....
You have 2 units? 8kw? So what is the pass through power limit? ( At this moment I'm thinking you have like 15kw of panels).
Hoping I will have no problem with a measly 6kw of panels.

I do like the idea of an auto transfer switch,
Just like a auto generator transfer switch. I was wondering they same thing just as a double safety to make sure there's not any back feeding in a grid down.

Are the sting inverters then powering the Megarevo? 2 separate systems that can feed the grid.

 

[X propane]

Are you powering at night off a battery bank also?

 

[fromport]

I only have micro's IQ7's Enphase. Hmmm, now I need to bug you a little more.....
You have 2 units? 8kw?

I have 2x MR 8K units, but only 1 hooked up atm with 24kWh batteries

So what is the pass through power limit?

According to the manual you put #10 wire between the inverter and the grid.

#10 THHN 90C wire is supposed to go up to 40 amp but all kinds of things happen when you put multiple wires together in a conduit including derating of the temperature. 75C -> 35 amps, 60C -> 30 amps.

The units (on-grid) ratings:


So once the batteries are charged and no load from house and full PV hookedup up (up to 12kW) it technically could push nearly 37 amps to the grid. The manual does not specify the rating of pass-through but I doubt is has a larger than 50 amp relay in it.
So you I have to asume you can not push 3000 watt /240 volt = 12.5amp AC coupled micro inverters connected to the GENERATOR hookup extra to the grid.

( At this moment I'm thinking you have like 15kw of panels).

That is about right ;-)

Hoping I will have no problem with a measly 6kw of panels.

6000/240 = 25 amps of micro inverter power around noon.

I do like the idea of an auto transfer switch,

Yep

Just like a auto generator transfer switch. I was wondering they same thing just as a double safety to make sure there's not any back feeding in a grid down.

That is already built in the MR.
When grid goes down, a relay opens the wires to the grid and the load is powered by PV panels and/or batteries and/or generator.

Are the sting inverters then powering the Megarevo? 2 separate systems that can feed the grid.

Don't understand the question.
I currently have:
12 enphase micro inverters
3 IQ8 micro inverters
fronius string inverter on a DC-solar trailer with additional

Are you powering at night off a battery bank also?

Yes
This is a graph of a couple of days ago:

at night batteries go down to just above 50% during the gets recharged, after that feeding into the grid.
During that day I put 75kW back into the grid and got 0.5kWh from my utility company

 

[X propane]

Don't understand the question.
I currently have:
12 enphase micro inverters
3 IQ8 micro inverters
fronius string inverter on a DC-solar trailer with additional

I see now, ? the DC solar trailer is powering the Megarevo. You are feeding the Megarevo through the AC Input, and not the generator input?

 

[fromport]

I see now, ? the DC solar trailer is powering the Megarevo. You are feeding the Megarevo through the AC Input, and not the generator input?

I have 2 PV strings hooked up to the MR:
PV2 : 2000 watt
&
PV3 : 3000 watt

My solar trailer (with fronius) is totally independant and a grid tied only.
When the power is out, it doesn't help.
Same for my micro inverters.

 

[X propane]

Man you got a lot of solar and components!! I have felt the pain of grid down for 7 day after an ice storm, then nice Sunny days after the storm with micro doing nothing.

Thank you for sharing with us your solar set up, and experience's so far!

I really want to feed our micro's into a Megarevo, to charge a small battery . To help off set the peak time our utility has recently imposed.

Next year more battery storage, and hopefully ad a small DC array.
Hopes and dreams......

Eric R.

 

[fromport]

Man you got a lot of solar and components!! I have felt the pain of grid down for 7 day after an ice storm, then nice Sunny days after the storm with micro doing nothing.

That is no fun!

Thank you for sharing with us your solar set up, and experience's so far!

I really want to feed our micro's into a Megarevo, to charge a small battery . To help off set the peak time our utility has recently imposed.

Next year more battery storage, and hopefully ad a small DC array.
Hopes and dreams......

Like I wrote earlier.
I think it is best to have the micros connected through a double pole relay.
The relay is powered by the grid and as long as the grid is up, you would like to have the micros connected to your main breaker panel, backfeeding to the grid.
Now you can maximize the PV strings to your MR.
When the grid goes away, the relay looses power, and switches the micros over to the gen input of the MR.
While switching, the micros will loose at least a few cycles so I hope they will go through the 5 minute "scan for grid" phase (they will find the MR generated power) and then start backfeeding.
If the MR should see the extra power coming in, batteries are full, not enough load to get rid of the power of the micros it should use a combination of freq shifting, voltage changes to convince the micros to stop producing full power. If you have older micros (like my Enphase M215) as soon as the frequency will be > 2 Hz difference, they will switch off. If you have iq7/8 micro's they will modulate and start producing less starting at 0.5Hz deviation from the standard frequency.
That would be my goal.
The only problem I can think off is if the relay switches too fast, not proviking the 5 minute timeout.
In that case a time delayed relay should be used with eg 5 second delay between switching status.

Only one way to find out.

 

[X propane]

Roughly $800 for. Auto transfer switch, I can handle that if I need there is a 75% chance this will all work?. If this is the same as the double pole relay your speaking of?

The MR settings would have to be corrected for a grid down situation? Like different settings than trying to do peak time shift? Or when it senses no grid power from ac side, and will hopefully know to modulate the micro's?

I know I'm asking a lot of somewhat silly questions, but I want a good understanding before I order the unit.

I already paid too much for the installed system we have now, because of lack of research on my part.

Thanks again this is very helpful , Eric R.

 

[fromport]

Roughly $800 for. Auto transfer switch, I can handle that if I need there is a 75% chance this will all work?. If this is the same as the double pole relay your speaking of?

yes
ATS == double pole relay with some extra electronics/features.

The MR settings would have to be corrected for a grid down situation? Like different settings than trying to do peak time shift? Or when it senses no grid power from ac side, and will hopefully know to modulate the micro's?

I know I'm asking a lot of somewhat silly questions, but I want a good understanding before I order the unit.

I already paid too much for the installed system we have now, because of lack of research on my part.

Thanks again this is very helpful , Eric R.

I have 2 AIO hybrid inverters currently: MR & the LuxPower.
The LP has a 200 Amp relay pass through.
In that case you can hookup the micros constantly to the GEN input on the inverter, no need for an ATS.
The LP will disconnect *everything* from the grid including your micro inverters when there is a grid failure.
It is 12kW AC (vs 8kW AC on the MR) rated.
It has true support compared to the MR,
Double the price for 50% more power, but you won't need the ATS (plus installation).
If I were you I would seriously consider the LP instead of the MR.

The LP is sold under different labels including EG.
For threads with more info:

New Lux Power LXP-LB-US 12k / GSL-H-12KLV-US with 200A AC Passthrough Current (US Market)

I was notified yesterday that GSL will be releasing their new 12K hybrid split-phase inverter with 200A AC passthrough for the US market. Production will be limited in September but will ramp up through October and November. Significant features to note: 12kW EPS output (surge: 14k 10 mins...

diysolarforum.com

&

EG4 new AIO rated 12K output and 18kPV aka "EG4-18Kpv-12LV"

https://signaturesolar.com/eg4-18kpv-hybrid-inverter-all-in-one-solar-inverter-eg4-18kpv-12lv/ Looks promising... Price seems reasonable

diysolarforum.com

 

[X propane]

Oh gee thanks, a whole nother inverter to research. This will help drive my wife nuts!

Do you already have the LP in operation?
Really Man, you seem to have all the cool gadgets, do you have an electric Maserati as well?

Seriously though thanks for your suggestions!

Eric R.

 

[fromport]

Do you already have the LP in operation?

I had it in production for a couple of months, with PV & grid tied only.
Mainly experimenting at the moment.

Really Man, you seem to have all the cool gadgets, do you have an electric Maserati as well?

I have driven 150k+ miles electric since 2010 (5 ev's so far, ordered my 6th on earth day)
Nothing exotic. I tend to go for bang for the buck.

Seriously though thanks for your suggestions!

I love making other people's life more complicated ;-)

 

[X propane]

I started reading the tread last night, got 14 pages on before I fell asleep on the couch.
Zzzzz.
So much better firmware? Also the support by itself is worth a few hundred $ more.
The information screen is far more appealing, when it doesn't look like it's straight out of 1985.

With whatever hybrid we choose, I have the obstacle if the ct's having to stretch 130 feet to our main house panel where the meter is.

 

[X propane]

I have driven 150k+ miles electric since 2010 (5 ev's so far, ordered my 6th on earth day)
Nothing exotic. I tend to go for bang for the buck.

Not a Tesla in the 6 EV's I'm guessing. I see them all over in the area I live in.
I myself have never even driven a EV.
My life style and choice's still require some fossil fuels.

 

[fromport]

I started reading the tread last night, got 14 pages on before I fell asleep on the couch.
Zzzzz.
So much better firmware? Also the support by itself is worth a few hundred $ more.
The information screen is far more appealing, when it doesn't look like it's straight out of 1985.

With whatever hybrid we choose, I have the obstacle if the ct's having to stretch 130 feet to our main house panel where the meter is.

That is not a problem since a CT uses current (milliamps) and is not influenced by voltage drop.
See https://docs.openenergymonitor.org/electricity-monitoring/ct-sensors/extending-ct-cable.html
I don't think 130 ft will be a problem, but I would solder the extension cables, do not use plugs!

Not a Tesla in the 6 EV's I'm guessing. I see them all over in the area I live in.
I myself have never even driven a EV.
My life style and choice's still require some fossil fuels.

We had 2 x Toyota Rav4EV's which was a tesla motor/battery in a Toyota vehicle.
Didn't have Fast Charging (did buy the 3rd party aftermarket upgrade).

 

[minerva]

I started reading the tread last night, got 14 pages on before I fell asleep on the couch.
Zzzzz.
So much better firmware? Also the support by itself is worth a few hundred $ more.
The information screen is far more appealing, when it doesn't look like it's straight out of 1985.

With whatever hybrid we choose, I have the obstacle if the ct's having to stretch 130 feet to our main house panel where the meter is.

Not sure if 130 ft is too much, but it is absolutely NOT irrelevant. I would be skeptical.

 

[X propane]

I don't think 130 ft will be a problem, but I would solder the extension cables, do not use plugs

Oh that's a relief thanks, I will check out the link you provided me for more research. This will aid in the overloading of my tiny brain.