Analysis:

When AC side is down, it may cause inverter no finding of grid voltage.

Investigation:

Dissemble the output port of inverter, use a multimeter to find out if the voltage between live line and neutral line is 220V, if not, we can assume there is no problem with inverter, and outside AC side, you need to test the air breaker, disconnecting link, overvoltage protection and things like that.

Analysis

Low power generation can be caused by many reasons, weather, temperature, shade, inverters, panels orientation, panel angles and so on.

Investigation

Weather: fog, rain, cloud, bad weather cancause low power generation.

Temperature: high or low temperature can reduce the panel’s efficiency, and lower the power generation.

Shade: should check the site environment first, including trees, power pole,water tank, clothes, bird droppings, front panels covers back panels, one of the character of panels is once one panel covered, it will lower the whole system’s efficiency.

Panel orientation: check if the orientation is the best angle, the highest solar generation point is from 11:00AM to 2:00 PM.

Panels: different solar panels can not be connected to the same string and same MPPT, please notice a broken panel can significantly lower whole system’s power generation, please change broken panels immediately.

Inverter: once the inverter is down it will not generate any power, please check the DC voltage,which is set to inverter’s voltage range.

Gridreason: Grid fluctuation can happen frequently, reliablegrid quality is one essential condition to ensure inverter working smoothly, soplease notice the grid fluctuation, frequency fluctuation may all effect the inverter’s power generation, even can cause inverter error, also nearby high power consumption can affect the inverter’s power generation.

Growatt TL and MTL series inverters will display a “No AC Connection” message when the AC grid has lost, and showing “AC V Outrange” when the AC grid voltage is out of the permitted range. However, the UE series inverters changed slightly, it only displays “AC V Outrange” on its LCD, either the AC grid has totally lost, or AC grid voltage is out of the permitted range.

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This phenomenon is normal. In order to avoid any misoperation caused by surrounding noise, we adjusted the sensitive of knock control function. Furthermore, we added a “LOCK” to prevent any misoperation for Growatt UE series inverters. We can not change the sensitive of it.

TL means “Transformerless”, the design without transformer internally is the leading-edge technology. It reduced weight of inverter, whereas increased the DC-to-AC convertion efficiency. MTL means “Multi MPP Tracker”. Inverter with more than one tracker can provide more flexible system design, for example, strings face to different directions, it is helpful when there is limit roof space for panels. Flexible system design / panel configuration helped to increase the system’s annual yield. Note: please make sure to connect strings to Tracker A and Tracker B separately, if the strings face to different directions.

PV: xxx / xxx are the DC voltage from PV panel. For Growatt 2 MPPT machine (Growatt3600MTL, Growatt4200MTL, Growatt5000MTL), it indicate DC voltage of each MPPT. For 1 MPPT machine (Sungold1500, Sungold2000, Sungold3000, Sungold5000, Growatt1500, Growatt2000, Growatt3000, Growatt4400, Growatt5000), it will display as PV: xxx / 0. B: xxx v indicate the bus voltage in inverter’s boost circuit bus line.

Step 1: Connect inverters parallel by RS485 socket, make sure that Pin1 to Pin1 and Pin2 to Pin2. Step 2: Connect one inverter to the computer via RS-485. A RS485-to-RS232 is needed. Step 3: Set ShineNet software to communicate by Serial Port.