EASUN SMG II 6.2 KW /48W does not accept all the available energy from the solar panels.

[Mattb4]

Your chart for PV current indicates ~3.5A. I do not see the battery charge current in the image due to your screen capture. If you are getting in 4A at 125vDC than your panels are only producing 500W at that time.

All your chart measurements tend to support a panel or connection based problem.

 

[remo.78]

I turned on the "Sun first" mode. Today the sun is not visible, it is cloudy. And here is the graph that the inverter shows. I suspect that the inverter is faulty. I don't see any other reasons.

 

[remo.78]

Press and hold ENTER button for 3 sec. and check which output source priority (Menu item 1) you have set. You should have anything except UTL mode set for solar power to be used first.

That's not how it works. You are measuring PV short circuit current, not inverter current. Don't do this across the battery - you will blow up your multimeter. To measure inverter PV current you need to connect miltimerter in series with PV circuit or 20A (red) terminal to PV+ (from panels) and Com (black) to inverter PV+ input and leave PV- wire as is connected to inverter PV- input.

I did just that and measured the short circuit current in this way.

 

[remo.78]

Your chart for PV current indicates ~3.5A. I do not see the battery charge current in the image due to your screen capture. If you are getting in 4A at 125vDC than your panels are only producing 500W at that time.

All your chart measurements tend to support a panel or connection based problem.

The connections are OK, I used quality MC4 connectors. Also, if there was a problem with the connections, there would not be a short circuit current close to the declared one measured at the inverter input.

 

[remo.78]

It turns out that the maximum power value in clear weather at 2:54 PM Voltage - 169 V, Amperage - 3.8 A. Total 169 * 3.8 * 0.78 = 500 W. The multimeter shows a short circuit current of about 9 A, voltage 169 V. I understand that the short-circuit current on the multimeter can have an error of 10%, but not such a monstrous one. I will buy another inverter from another company and check.

 

[Mattb4]

Your DMM can not possibly show voltage and Isc at the same time. If you had a panel tester it can.

I hope the new AIO solves your issue.

 

[TM48]

Before you spent more money....What does Solar Assistant's inverter screen say the current and voltage and wattage is? Do you not believe the data or do you just enjoy doing things the hard way?

 

[remo.78]

Your DMM can not possibly show voltage and Isc at the same time. If you had a panel tester it can.

I hope the new AIO solves your issue.

I took these readings from the inverter statistics history.

 

[remo.78]

Before you spent more money....What does Solar Assistant's inverter screen say the current and voltage and wattage is? Do you not believe the data or do you just enjoy doing things the hard way?

I just judge by the readings of the inverter. And I see by analyzing its readings that the inverter does not consume available energy from solar panels for whatever reason. And this does not suit me. It makes sense that I want to use the full potential of solar panels, not just 10% of it.

 

[hojnikb]

I just judge by the readings of the inverter. And I see by analyzing its readings that the inverter does not consume available energy from solar panels for whatever reason. And this does not suit me. It makes sense that I want to use the full potential of solar panels, not just 10% of it.

Hi, were you able to resolve your issue?

I have the same sort of inverter (Anenji) and i saw similar sort of power (% wise) at that time.

You must consider the time of the year and position of the sun. I'm not sure how USA differs from europe, but in my case (7.1kWp of panels, 15* south facing position) best peak i saw was ~4kW (maybe 4.5kW for a brief period) of power back in november. Which is pretty much in line (% wise) from other, more expensive installations in the area.

You having ~1.8kWp of peak power means you _could_ hit 800-900W at peak in this time of year. But given the low amount of panels and low voltage, MPPT for sure won't work as efficiently as it could if you had more of them or higher system voltage.

But worth a shot is checking your panels if all of them are ok and perfoming equally. And shading. It has a big impact on production.I'd say the inverter isn't at fault here. If there was something faulty at MPPT side, you'd get nothing.

 

[tomhanman]

It's always great to get to the end of a thread none the wiser! With all the attempted help received it's a real shame the OP couldn't first give clearer details and pictures in order to help those helping him. And second report back with how this concluded in order to help those arriving here later.

I found this because I am considering a set of three of these as a 3-phase 18kW installation. So I'd very much like to know it they're viable. Nevermind.

 

[SemiProffi]

Unfortunately, the level of this blog (and not only this one) is really low. Those who are looking for an explanation for their problems can be amateurs, but those who give answers and explanations must be at least semi-professionals.

I have a 3-phase solar system with iSolar SMP 5 kW inverters. Unfortunately, last year lightning destroyed one of my inverters. Of course, EASUN no longer offers these models. After comparing all possible data, I decided to buy easun-smg-ii-6.2-kW. I have been monitoring the operation of this inverter for several weeks and comparing the results with the iSolar SMP 5 kW. Right from the start, I noticed the same shortcomings as remo.78. I do not use smartphone applications. I read the data from all inverters with Arduino and analyze it using the monitor in Arduino IDE. To display the output power, I have a 3-phase W-meter on the inverter outputs.

Results:
1. Even with higher loads and favorable insolation, the PV voltage never drops below 365 V
2. With charged batteries and a higher load, the output power on the W-meter is always about 200 W higher than the PV power
3. The same difference of about 200 W is also at medium load when the PV voltage is around 400 V
4. At low load, the difference is "only" about 150 W

Explanation:
1. The smg-ii series inverters clearly do not have a boost unit that raises the PV voltage above the minimum required voltage of 360 V, which is necessary for the inverter to produce 230 Veff even with poor insolation
2. The higher output power by 200 W is very likely a (wide) margin of safety for the off-grid mode. This indicates that the manufacturer does not master the dynamic adjustment of the inverter's power to changes in load and illumination.
3. The declared efficiency of the inverter is 95%. The actual efficiency of the system due to these major shortcomings is 80 - 85%, although the PV power is sufficient
4. It is even worse at low load, when the efficiency drops to only a few 10%

Conclusion: in a residential building, larger consumers are active only for a limited time. Several smaller consumers represent a permanent consumption of a few 100 W when the efficiency is lowest. The average efficiency is, in my opinion, 25-30% lower than the declared 95%. Unacceptable! The problem is the data about the device, which the manufacturer does not provide, thereby misleading customers.

Conclusion after conclusion: some will probably argue with these findings and conclusions of mine, but I have stated my opinion.

 

[Patmos777]

Unfortunately, the level of this blog (and not only this one) is really low. Those who are looking for an explanation for their problems can be amateurs, but those who give answers and explanations must be at least semi-professionals.

I have a 3-phase solar system with iSolar SMP 5 kW inverters. Unfortunately, last year lightning destroyed one of my inverters. Of course, EASUN no longer offers these models. After comparing all possible data, I decided to buy easun-smg-ii-6.2-kW. I have been monitoring the operation of this inverter for several weeks and comparing the results with the iSolar SMP 5 kW. Right from the start, I noticed the same shortcomings as remo.78. I do not use smartphone applications. I read the data from all inverters with Arduino and analyze it using the monitor in Arduino IDE. To display the output power, I have a 3-phase W-meter on the inverter outputs.

Results:
1. Even with higher loads and favorable insolation, the PV voltage never drops below 365 V
2. With charged batteries and a higher load, the output power on the W-meter is always about 200 W higher than the PV power
3. The same difference of about 200 W is also at medium load when the PV voltage is around 400 V
4. At low load, the difference is "only" about 150 W

Explanation:
1. The smg-ii series inverters clearly do not have a boost unit that raises the PV voltage above the minimum required voltage of 360 V, which is necessary for the inverter to produce 230 Veff even with poor insolation
2. The higher output power by 200 W is very likely a (wide) margin of safety for the off-grid mode. This indicates that the manufacturer does not master the dynamic adjustment of the inverter's power to changes in load and illumination.
3. The declared efficiency of the inverter is 95%. The actual efficiency of the system due to these major shortcomings is 80 - 85%, although the PV power is sufficient
4. It is even worse at low load, when the efficiency drops to only a few 10%

Conclusion: in a residential building, larger consumers are active only for a limited time. Several smaller consumers represent a permanent consumption of a few 100 W when the efficiency is lowest. The average efficiency is, in my opinion, 25-30% lower than the declared 95%. Unacceptable! The problem is the data about the device, which the manufacturer does not provide, thereby misleading customers.

Conclusion after conclusion: some will probably argue with these findings and conclusions of mine, but I have stated my opinion.

Any news on your system?? I intended to buy a SMG III 6.2 Inverter but now I'm a bit scared to go ahead.......
I have one question : Is it possible to use an external MPPT charge controller with the Easun???

 

[SemiProffi]

I did a little searching to find out the difference between SMG II 6.2 and SMG III 6.2 but it is not possible to find out from the data provided by the manufacturer. In my opinion, there are no significant differences. As I already wrote, the problem is the data that the manufacturer does not provide. I think that the inverters offered by EASUN are just poor copies of Australian models (Voltronik...).
Questions for the manufacturer:
1. PV Array MPPT Voltage Range is 60 - 500 Vdc. What is the PV Array DC/AC Voltage Range?
2. Efficiency is defined as the ratio between Pout(AC) and Pin(PV). Why is this ratio not even close to (Peak Efficiency(PV to INV)) 0.96 but is between 1.05 and 1.20 at higher loads? It is even worse at low loads.

I don't know what your professional profile is. If my explanations are not clear to you, ask.

 

[SemiProffi]

Sorry, I missed your question. The MPPT charger in the SMG is not the problem. So using an external MPPT charger does not solve the shortcomings of the inverter itself.

 

[Patmos777]

Sorry, I missed your question. The MPPT charger in the SMG is not the problem. So using an external MPPT charger does not solve the shortcomings of the inverter itself.

Thank you