Megarevo RxLNA Discussion
- Thread starter jsmetalcraft
- Start date
I'm kind of surprised you unpackaged it, I would've been tempted to put the new inverter up FS after your previous experience!
flygeek
New Member
- Joined
- Nov 29, 2021
- Messages
- 32
I've updated to the latest (1.03.11 and 1.04.09) and apart from the initial glitch requiring a change in power locale - all has been good. It's been feeding data to the solarman console (pro.solarmanpv.com) reliably for about ten days.
One thing I did notice, however, is when I added a second string to the unit (I'm in an urban, flat roof environment) the unit rebooted after about a minute, but then recovered nicely.
My config is a 120Ah LifePO4 battery, grid-tied, Load1 fed into a transfer panel and Load2 on an isolated panel and 11x 340W Hanwha Q-Cell Duo panels across two strings (6 and 5). I'm on the grid, but don't feed back into it (Anti-Reverse is enabled).
Attachments
I have 3 fire extinguishers standby and wear glasses!
flygeek
New Member
- Joined
- Nov 29, 2021
- Messages
- 32
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).
fromport
Solar Addict
I now have 2 of the 4 mppt strings hooked up , each with a DC disconnect.
When I disconnect a string, nothing happens except loss of power of the string.
When I re-connect it however, it always needs to start over, not a cold start but a new find of the max power.
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 ?
I am always amazed by the startup graphs.:
There is a high voltage very early but it only starts producing amps when there is enough solar.
I live in a valley and both at the beginning and at the end of the day I have a lot of shading going on.
jsmetalcraft
New Member
- Joined
- Jul 7, 2021
- Messages
- 188
Here is the shot of mine. What I see is in the morning when the array voltage reaches 80+ volts it goes into the test. Looks like I get a voltage spike of 150-180 volts on the test. Then back to 85 volts. I do have the isolation test turned on.
flygeek
New Member
- Joined
- Nov 29, 2021
- Messages
- 32
@jsmetalcraft - now that you mention a morning spike, I see the same in mine, right around 5:30 when the voltage starts to pick up. @fromport - I noticed the same thing when adding a string - a soft reboot. I have a 4:2 PV combiner box outside and can flip the strings off and on if necessary.
I also need to get a bigger battery (my 280 Ah is at the cottage), you can see the unit cutting out the PV feed when the battery is full. Since I don't currently feed to the grid, the extra power has nowhere to go.
I also need to get a bigger battery (my 280 Ah is at the cottage), you can see the unit cutting out the PV feed when the battery is full. Since I don't currently feed to the grid, the extra power has nowhere to go.
Good morning, I am testing the inverter off-grid with one string solar panels and one lithium battery connected via CAN. For some reason, the inverter only charges using the solar panels for around 30 minutes and then stops giving error "bus over vol". If I do full restart of the inverter, it charges again for around 30 minutes before stopping again. I have firmware version ARM V1.03.11 and DSP V1.04.09. Anyone an idea what could be causing this?
Attachments
jsmetalcraft
New Member
- Joined
- Jul 7, 2021
- Messages
- 188
How many watts total is the array?
In 1. Setup>2. Grid STD>1. React Mode>What is your setting?
How many amps are you charging with?
Reason I ask is I have reported the issue with Bus over VOL and Bat over Vol. Been testing and I used Power Factor instead of React Power yesterday. Ran one day smooth as butter. Knock on wood.
As far as charging I had seen similar but only spikes where the charge would quit but picked right back up without any Warnings. I am about 400 watts over paneled on each three arrays. I covered a few cells on each array and seem to help. I also found that with V1.04.09 I can only get about 70 amps before I have drop outs. Before the update I had gone as high as 140 amps without issue. Ran 100-125 for months, again without issues.
Curious to see if we can narrow down some of these issues and understand some of the setting more fully.
The array power is only 2.2kW. So max charging would be 40A.
Our setting in
-> Grid STD> US-CA
-> Run Setting> React Mode> React PF> C0.100 (factory setting)
-> Run Setting> React Mode> React RP> 0 (factory setting)
Not sure how to use Power Factor instead React Power?
jsmetalcraft
New Member
- Joined
- Jul 7, 2021
- Messages
- 188
I chose Power Factor and then returned out of the menu.
Can you elaborate what you mean by using PF instead of reactive power?
NCSolarGarage
13.2kW Off-Grid
- Joined
- Sep 23, 2021
- Messages
- 213
I see the same morning spikes as everyone else. The unit needs 120v on the DC side to "turn on" the MPPT. It will then hold 85v and allow the current to increase until 1amp. At that point, it allows voltage to increase to find max power of the panels. This has been very consistent.
It does the same in the evening. Once power drops below 100w, it will reduce voltage to 85v and hold there while current tapers to zero.
It does the same in the evening. Once power drops below 100w, it will reduce voltage to 85v and hold there while current tapers to zero.
jsmetalcraft
New Member
- Joined
- Jul 7, 2021
- Messages
- 188
It's my assumption that the four choices are modes? So each is a choice or mode instead of settings that the inverter used from each one. I don't have a clue what QU Wave and QP wave are. In Reactive mode I feel and seem to notice it is the reaction time that the inverter uses to changing loads, especially with anti reverse. When a resistive load turns off I noticed the inverter over shoots and feeds into the grid for a bit. I was worried about this so had Reactive power to +10? I think. But it seemed like the power fed towards grid, and that fed into by grid, jumped around more. Back to PF mode it seems that while it still over shoots, overall the changes look much smoother when looking at external monitor.
Also I noticed that on the external monitor my PF has been more normal. Running in React Mode I would most of the time see .15 +/- on Grid coming in past the CT's. I thought that maybe the inverter does not sync with grid very well. Now it is .35PF @ 60 watts. My PF readings also were a bit wacky on the Grid input of the inverter when feeding towards the grid. Now I show 300 watts @ .90 PF. I even run two Reference transformers to get betting readings on the monitor. They helped with one plugged into the EPS panel and the other into the Main Panel.
jsmetalcraft
New Member
- Joined
- Jul 7, 2021
- Messages
- 188
Here is an example of a few months ago before the two Reference transformers.
Here is a shot of current operation.
Here is a shot of current operation.
Just to clarify, you set React PF> C0.100?
jsmetalcraft
New Member
- Joined
- Jul 7, 2021
- Messages
- 188
Yes, just left it as it was. a C0.100.
billyboy12
New Member
- Joined
- Apr 28, 2022
- Messages
- 17
Hello All, I am looking for a digital copy of the megarevo 8kw owners manual? Any suggestions?
billyboy12
New Member
- Joined
- Apr 28, 2022
- Messages
- 17
NCS; I am late to the conversation. I just installed my inverter and having this same problem. Kindly offer a solution if there is one.
NYCER
New Member
- Joined
- May 27, 2020
- Messages
- 29
NYCER
New Member
- Joined
- May 27, 2020
- Messages
- 29
NCSolarGarage
13.2kW Off-Grid
- Joined
- Sep 23, 2021
- Messages
- 213
I was lucky enough to obtain a copy of the latest firmware (Thank you!) and have confirmed that parallel function is now supported for these inverters. Unfortunately, I only have 1 inverter wired up right now since the parallel function was not available when I did the initial install. I'm going to try to get the wiring updated this week, so that I can test out the additional feature and report back.
Was there another update since the firmware update from last month?
Similar threads
