Sleeper85
Sunday handyman
- Joined
- Nov 28, 2022
- Messages
- 503
Hello,
I have already posted about the behavior of my MPPT controller but a member thinks that my production is abnormal and suggested that I create a new topic.
My panels are oriented to the east on a roof with a slight slope of 15°, therefore on the blue line of the diagram below.
![1671398100730.png 1671398100730.png](https://diysolarforum.com/data/attachments/125/125237-788fe2c6c6cc2b8d88286229a4e7987a.jpg)
To the east is a hill and in winter the sun is visible only from 1 p.m. to 3 p.m. and at that time it is already low. (in the morning -10°C currently)
------------- 12h17 ------------------------ 14h40 ------------
![20221217_144041.jpg 20221217_144041.jpg](https://diysolarforum.com/data/attachments/125/125246-bda0fc344c7d52e9c2148f492565a7c3.jpg)
Here is the ideal inclination for my city. (the worst exposure for a month of December)
![1671398179198.png 1671398179198.png](https://diysolarforum.com/data/attachments/125/125238-b31b2d9d0579bf8d4eeb78909f780d15.jpg)
I have an EAsun SMX II 5.6kW AIO ( SRNE HF4850S80-H rebranded ) connected to Solar Assistant (more info in my signature).
String of 8 Jinko 415WC panels (STC values) :
MPPT input voltage range 120~450 VDC.
So now I have two questions:
Production of the day
![1671399877262.png 1671399877262.png](https://diysolarforum.com/data/attachments/125/125247-3f279523d950f33b87112090110d515e.jpg)
MPPT behavior at low light
![04_PVCurrent - MPPT and low light.png 04_PVCurrent - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125242-acdf1010ddbffd36b84d0c908b9284b4.jpg)
![04_PVVolt - MPPT and low light.png 04_PVVolt - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125240-2af75473a88cb1c938e974f5f1e92c0a.jpg)
![04_PVPow - MPPT and low light.png 04_PVPow - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125241-da9d5625818c0321f2c23946df7ac9dc.jpg)
![04_BatPow - MPPT and low light.png 04_BatPow - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125244-6023ca0787a6f221ae5f0e295063d95a.jpg)
![04_BatCurrent - MPPT and low light.png 04_BatCurrent - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125245-19dbcf02bc66a857b3b9c5c2dc22fb0a.jpg)
Thanks for your feedback
I have already posted about the behavior of my MPPT controller but a member thinks that my production is abnormal and suggested that I create a new topic.
My panels are oriented to the east on a roof with a slight slope of 15°, therefore on the blue line of the diagram below.
![1671398100730.png 1671398100730.png](https://diysolarforum.com/data/attachments/125/125237-788fe2c6c6cc2b8d88286229a4e7987a.jpg)
To the east is a hill and in winter the sun is visible only from 1 p.m. to 3 p.m. and at that time it is already low. (in the morning -10°C currently)
------------- 12h17 ------------------------ 14h40 ------------
![20221215_121133.jpg 20221215_121133.jpg](https://diysolarforum.com/data/attachments/125/125239-5be2ac91d7e35a59005a6c8c34e8a6d5.jpg)
![20221217_144041.jpg 20221217_144041.jpg](https://diysolarforum.com/data/attachments/125/125246-bda0fc344c7d52e9c2148f492565a7c3.jpg)
Here is the ideal inclination for my city. (the worst exposure for a month of December)
![1671398179198.png 1671398179198.png](https://diysolarforum.com/data/attachments/125/125238-b31b2d9d0579bf8d4eeb78909f780d15.jpg)
I have an EAsun SMX II 5.6kW AIO ( SRNE HF4850S80-H rebranded ) connected to Solar Assistant (more info in my signature).
String of 8 Jinko 415WC panels (STC values) :
- WC = 8 x 415 = 3320WC
- Voc = 8 x 37.92 = 303.36V
- Vmp = 8 x 31,32 = 250,48V
- Imp = 13.25A
MPPT input voltage range 120~450 VDC.
So now I have two questions:
- Is having a production peak at 300W (10% before 12h without sun) abnormal given the very poor exposure of my panels in winter? (after 1 p.m. when it was sunny I peaked at 600W)
- My MPPT controller does not stabilize until I have at least 0.9A from PV, what do you think ? ( in low light the MPPT scans the voltage from high to low (90V) continuously)
Production of the day
![1671399877262.png 1671399877262.png](https://diysolarforum.com/data/attachments/125/125247-3f279523d950f33b87112090110d515e.jpg)
MPPT behavior at low light
![04_PVCurrent - MPPT and low light.png 04_PVCurrent - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125242-acdf1010ddbffd36b84d0c908b9284b4.jpg)
![04_PVVolt - MPPT and low light.png 04_PVVolt - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125240-2af75473a88cb1c938e974f5f1e92c0a.jpg)
![04_PVPow - MPPT and low light.png 04_PVPow - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125241-da9d5625818c0321f2c23946df7ac9dc.jpg)
![04_BatPow - MPPT and low light.png 04_BatPow - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125244-6023ca0787a6f221ae5f0e295063d95a.jpg)
![04_BatCurrent - MPPT and low light.png 04_BatCurrent - MPPT and low light.png](https://diysolarforum.com/data/attachments/125/125245-19dbcf02bc66a857b3b9c5c2dc22fb0a.jpg)
Thanks for your feedback
Last edited: