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Megarevo RxLNA Discussion

Slvrsky07 said:
It sounds like the inverter does not output to them since they are in the main panel and not the EPS or critical loads panel.
Click to expand...
So all the homes loads would have to be moved to the critical/subpanel for the inverter to cover them? SolArk/deye for example supply power directly to the main panel by using the inverters AC input instead as an output when the inverters operates as a grid tie inverter. This allows the inverter to supply all of the homes loads in the main panel. This allows for only a few critical loads to be moved to a subpanel to be powered offgrid, which is great because most people rarely have power outages and would be fine only have a few loads powered during the short duration outages..
the loads in the critical panel can still be powered by the grid tie inverter output and or the grid simultaneously via the connection from the main panel to the critical panel
 
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So that works fine if you only want to be grid tied. Also when the grid goes down there’s not a way to disconnect from your main if you also have batteries. So for instance, all the power is connected to your “grid” terminals on your inverter, this is connected to your main panel on a breaker. The PV will push back to the grid if load 1 and 2 are not demanding energy and your batteries are full. Now let’s say the grid goes down, the signal is not showing to the “grid” input and the inverter will disconnect all power to that terminal. Your whole mains panel is dead since there isn’t power from the power company and since you don’t have anything hooked to load 1 and 2, the inverter will shut down not having anywhere to put the PV energy. This is to prevent back feeding into the grid during a power outage and killing linemen.
 
Is the issue that your Load2 isn't working, or that it isn't "Smart Load"? I'm guessing you want Load2 to be powered only when there is excess solar? If this is the case, while not as elegant, you can probably set up a smart relay to turn the load on using 3rd party solution.
 
I have large induction loads such as my old Air conditioner on my main panel. I also have the grid breaker that goes to the inverter on the main panel. I have everything else that I want running in case of a power outage on the critical loads panel connected to load 1 on the inverter.

The PV supplies the loads on the critical panel, charges the batteries and anything else gets pushed to the main panel, used there or sells back to the power company.
 
Slvrsky07 said:
So that works fine if you only want to be grid tied. Also when the grid goes down there’s not a way to disconnect from your main if you also have batteries. So for instance, all the power is connected to your “grid” terminals on your inverter, this is connected to your main panel on a breaker. The PV will push back to the grid if load 1 and 2 are not demanding energy and your batteries are full. Now let’s say the grid goes down, the signal is not showing to the “grid” input and the inverter will disconnect all power to that terminal. Your whole mains panel is dead since there isn’t power from the power company and since you don’t have anything hooked to load 1 and 2, the inverter will shut down not having anywhere to put the PV energy. This is to prevent back feeding into the grid during a power outage and killing linemen.
Click to expand...
As I described, this is why a small critical loads panel would be installed to get through most peoples short duration grid power outages. The inverter would be switched to offgrid mode to supply power out the AC out to the critical panel
 
Slvrsky07 said:
The PV supplies the loads on the critical panel, charges the batteries and anything else gets pushed to the main panel, used there or sells back to the power company.
Click to expand...
I’d want the battery (if not enough pv power was available) to cover the loads in the main panel so i wasn’t paying for the grids power to cover those loads.. then also zero export with Cts on the mains to prevent battery from being exported into the grid
 
I find the only way it will export the battery to the grid is on peak shift mode on the way I have mine setup. I do leverage this at a low amp dump rate when my batteries are full and my wind turbine needs a place to put power. I also have my CTs hooked to the grid input and tried the anti reverse both ways and it still will export the batteries in that mode.

I do recall seeing a video on a Deye/ SA doing what you describe using the CT sensors but I don’t think it would work without having a way to disconnect the main during a grid outage. I think the only way would be to either buy a auto disconnect unit from like generac that would disconnect the power before the main and allow the inverter to act as the generator or move everything you need to be backed up a loads sub panel.
 
Slvrsky07 said:
I find the only way it will export the battery to the grid is on peak shift mode on the way I have mine setup. I do leverage this at a low amp dump rate when my batteries are full and my wind turbine needs a place to put power. I also have my CTs hooked to the grid input and tried the anti reverse both ways and it still will export the batteries in that mode.

I do recall seeing a video on a Deye/ SA doing what you describe using the CT sensors but I don’t think it would work without having a way to disconnect the main during a grid outage. I think the only way would be to either buy a auto disconnect unit from like generac that would disconnect the power before the main and allow the inverter to act as the generator or move everything you need to be backed up a loads sub panel.
Click to expand...
When grid power isn’t present the inverter would disconnect its AC input from the grid. No additional auto disconnect needed. are you saying there’s no way to stop the battery from being exported past the meter? You said the only way and then said it still will export
 
Cheap 4-life said:
When grid power isn’t present the inverter would disconnect its AC input from the grid. No additional auto disconnect needed. are you saying there’s no way to stop the battery from being exported past the meter? You said the only way and then said it still will export
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Correct, we are saying the same thing about the grid power, but what I am getting at is what you asked earlier about the SA going to the main panel. If you are grid tied, you should/ NEED a way to stop current from back feeding the grid when the grid power is down if you are connected to the mains panel. The inverter will disconnect the grid input but not loads output if there is PV or battery.

Self consume and Batt Priority shouldn't export the battery back to the grid. What I was saying was about peak shift, I couldn't get to stop exporting even with CT sensors installed and tried both anti reverse settings.
 
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Correction, the grid connection would go off and turn off the inverter or change it to EPS mode. You would need to also hook the loads side to your main panel with that mechanical disconnect to make sure the grid feed to the inverter and the main to the power meter are disconnected. Sorry that's what I was thinking originally but I made it more complicated.
 
Cheap 4-life said:
So with it set up the way you describe. How does the inverter cover the water heater load if the inverter only supplies power out to the EPS panel?
Click to expand...
With the grid up I supply power to both main panel and EPS panel. If grid is down I only power the EPS panel. So you would need to move anything that you feel is "critical" to the EPS panel. Leave heavy loads that are not needed during a power failure in the main panel.

I am working on a way to get a second water heater as a dump load. I have a device that reads battery voltage. It will control a relay when battery reaches a certain voltage and shut off when the battery voltage falls below a certain point. The con I see with lithium is that voltage is not as good as SOC as a source for triggering a dump load. The high power relay that the device controls is DPDT, so that both heaters will not come on at the same time which would be 9000 watts.
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jsmetalcraft said:
With the grid up I supply power to both main panel and EPS panel. If grid is down I only power the EPS panel. So you would need to move anything that you feel is "critical" to the EPS panel. Leave heavy loads that are not needed during a power failure in the main panel.

I am working on a way to get a second water heater as a dump load. I have a device that reads battery voltage. It will control a relay when battery reaches a certain voltage and shut off when the battery voltage falls below a certain point. The con I see with lithium is that voltage is not as good as SOC as a source for triggering a dump load. The high power relay that the device controls is DPDT, so that both heaters will not come on at the same time which would be 9000 watts.
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Click to expand...
Does the inverter use battery power to supply the main panel loads and critical panel loads at the same time?

I currently use my Outback fm80 charge controller to trigger a relay to allow the water heater to come on when the battery reaches float voltage. When battery is no longer floating (via adjustable charge controller settings) the charge controller no longer closes the external relay.. works very well, always heating the water heater for free..
 
Cheap 4-life said:
Does the inverter use battery power to supply the main panel loads and critical panel loads at the same time?

I currently use my Outback fm80 charge controller to trigger a relay to allow the water heater to come on when the battery reaches float voltage. When battery is no longer floating (via adjustable charge controller settings) the charge controller no longer closes the external relay.. works very well, always heating the water heater for free..
Click to expand...
Yes, as long as the SOC of the battery is above what you program. For example I have mine set at 10%. When battery gets down to 10% the inverter switches to grid, aka bypass mode. But should grid go down, it will power the EPS panel down to my setting of 5%.

The MR should have or has the capability to do the same as your Outback. Just that the lack of firmware development has yet to be implemented. Usually called smart load which uses load 2 or the Generator port. Even the Signature Solar manual shows a generator , but that function has yet to be enabled.
 
jsmetalcraft said:
When battery gets down to 10% the inverter switches to grid
Click to expand...
What happens if the battery is full but the loads in the main panel exceed the max possible output of the inverter? Will the inverter switch to bypass, or will the main panel simply use the extra power needed directly from the grid and the inverter keeps pumping out its max possible output?
 
jsmetalcraft said:
The MR should have or has the capability to do the same as your Outback. Just that the lack of firmware development has yet to be implemented. Usually called smart load which uses load 2 or the Generator port. Even the Signature Solar manual shows a generator , but that function has yet to be enabled.
Click to expand...
So what do you currently do when the main water heater needs to be heated?
 
Greetings who has the new version that can me of the megarevo 8k that can provide it. Thank you
 
Pale1290 said:
Greetings who has the new version that can me of the megarevo 8k that can provide it. Thank you
Click to expand...

This is what _I_ experienced with the attached November firmware:

I upgraded the first file, hybrid_app8K_V14_20220824_gen.axf after upload it rebooted the inverter -> looked good.
upgraded 2nd file HybridInverter8KSNA_v1.4.13.B02D01.out -> reboot -> [RED] FAULT

Load Ct Fault

This file name clearly has a version number in it: 1.4.13
*BUT*

When I looked up firmware version:
ARM V1.03.06 (was on and am now back on V1.03.12)
DSP V1.04.06 (was on and am now back on V2.04.12)
140100 130201 <- new fields that I have never seen before.

There is also a screen I have never seen before
--DIAGNOSE--
000158 000000
000011 000004
008000 000002

It saw the grid, saw PV volt but refused to feed back into the grid.
In the end I downgraded to my previous version and everything started working again as expected.
Re-flashed your new version one more time:
Same again: red FAULT light and 24 LOAD CT FAULT

checked all settings, went back to my old version and it is working again.
Click to expand...

Please respond with your experience.
 

Attachments

  • 8kw-inverter-upgrading-software_2022-11-18_1523.zip
    15.5 MB · Views: 31
I just upgraded mine yesterday. I got the load ct fault like you did. I powered completely down and when it booted back up all was working but I see it added the generator feature. Mine was exporting extra PV to the grid as before.
 

Attachments

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fromport said:
This is what _I_ experienced with the attached November firmware:



Please respond with your experience.
Click to expand...
This is what it gives. It says there are no files
 

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Pale1290 said:
This is what it gives. It says there are no files
Click to expand...
Try to move the .axf and .out file to your desktop. Rename the file to something simple like 1.axf and 1.out. Right click on that steam application and run as admin. Upload to the program.
 
fromport said:
This is what _I_ experienced with the attached November firmware:



Please respond with your
Click to expand...
I did what you told me but still the same. only added the DSP: V 1.04.9 before it was V 0.00.0
 

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Slvrsky07 said:
Try to move the .axf and .out file to your desktop. Rename the file to something simple like 1.axf and 1.out. Right click on that steam application and run as admin. Upload to the program.
Click to expand...
I'm using Windows 11. I don't know if that has anything to do with it.
 
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