Degrade Mode of MAX series introduction
1. How to check Degrade mode
a. access installer or Distributor account via oss.growatt.com
b. Download History data from plant
![](https://www.amosplanet.org/wp-content/uploads/2022/06/1656146544296-1024x478.png)
C. Open excel file
D. Find “Degrade” Column
![](https://www.amosplanet.org/wp-content/uploads/2022/06/企业微信截图_16561470221214.png)
E. Degrade number Meaning
1) mode number: 0
No Degrade
2) mode number: 1
The bus voltage exceeds 850V and AC output degrades
3) mode number: 2
Special manual load limit mode, which can limit load to 80%, 60%, 30%
4) mode number: 3
High Grid voltage causes AC output power degrades
Solution1:
Set 148 and 149 register address value as highest voltage , like 6000*0.1V, make sure both of register address value are the same.
![](https://www.amosplanet.org/wp-content/uploads/2023/02/企业微信截图_16768862395201.png)
Solution2:
Disable high grid voltage degrade point
![](https://www.amosplanet.org/wp-content/uploads/2023/02/企业微信截图_16768922811528-1024x284.png)
8-15 bits are useless, all of them are 0;
Bit6 :Power voltage Func that is used to disable or enable high grid voltage degrating point.
so you should set 0000 0000 0101 1000 ( Hex value is 58 ) on register address 01
4) mode number: 4
High Grid frequency causes AC output power degrades
5) mode number: 5
BOOST over temperaturer ( 88.3 degree ) degree causes the degrade
6) mode number: 6
Inverter over temperature causes degrade ( 115.3 degree )
7) mode number: 7
Manually already set load limit (not 100%)
10) mode number: 10
Inverter ambient temperature derating ( 80.3 degree )
11) mode number: 10
M3 ambient temperature derating ( 80.3 degree )
12) mode number: 12
Line Impedance Calculation Load Derating
13) mode number: 13
Multi-machine anti-reverse flow causes the degrade
14) mode number: 14
Single inverter anti-reverse flow cause degrade
15) mode number: 15
Abnormal fan causes the degrade
![](https://www.amosplanet.org/wp-content/uploads/2024/02/企业微信截图_17084377589583.png)
23 is wave blocking and load reduction. When OCP or current oscillation occurs, wave blocking and load reduction will occur.
23是封波降载,在出现OCP或者电流振荡是会封波降载
封波后优化开波的,只是短暂封波保护