diy solar

diy solar

6*300w panels in 3S2P NOT GENERATING MORE THAN 9A

Dannyking

Dannyking

solar thirsty
Joined
Mar 9, 2021
Messages
38
What could be the issue? I have 6*300W Canadian solar panels connected in 3S2P configuration, a 60A/48V MPPT, but this has never generated above 9A. panel= 300W, VOC =39.7V, VMP= 32.9V, IMP= 9.43A MPPT max input voltage =150VDC, total PV power 1800W. I used 10mm sq cablesfor the installation
 

Attachments

  • 1707079858090.jpg
    1707079858090.jpg
    106.6 KB · Views: 13
  • 1707079858079.jpg
    1707079858079.jpg
    138.9 KB · Views: 13
What's your panel inclination?

How long has the system been up and running?

What is the battery SOC when observing 9a? What type of batteries?

Is it 9a on the pv side or the battery side of the charge controller?
 
Dannyking said:
both strings connected and tested
Click to expand...
Tested how? When the Vmp rating for your panels is ~9a and this is all you are getting from 2 parallel strings it is suggestive. However it is also possible that you do not have any loads more than that PV amount of 9a.
 
Mattb4 said:
One test you could run is to disconnect one string and see how the other string produces.
Click to expand...
I did the same thing when I first saw how piss poor my roof arrays were producing compared to the ground mound after I commissioned it, I thought for sure one was down.
 
Disconnect one string and then run 3S. Then run the other string as 3S. This will tell you which string is giving you issues. They should be close in voltage and current. The MPPT should output similar voltage and current. This is assuming that your battery is not fully charged.
 
How do you determine power output from a solar array by amperage?

Are we talking battery side amps or solar and what is the voltage?

We only worry about wattage on the solar side, not amps.
 
pollenface said:
What's your panel inclination?

How long has the system been up and running?

What is the battery SOC when observing 9a? What type of batteries?

Is it 9a on the pv side or the battery side of the charge controller?
Click to expand...
the system was upgraded a few days ago, the battery is a lifep04 and was at 65% , the 9A was on the battery side while 5.4A on the PV side
 
And you checked all PV connections?

Did you try disconnecting one string while 9A was flowing to see how it changed?
 
THANKS, ALL I think I have identified the issues, this morning i was having about 6A so I disconnected one string and i got about 4+ amps did same with the other string I was getting about 2.4A I think there is a deteriorating panel in that string and again the weather has not been clear for days visibility is poor but the sunlight shines.
 
Dannyking said:
THANKS, ALL I think I have identified the issues, this morning i was having about 6A so I disconnected one string and i got about 4+ amps did same with the other string I was getting about 2.4A I think there is a deteriorating panel in that string and again the weather has not been clear for days visibility is poor but the sunlight shines.
Click to expand...
Are both strings facing the same direction and at the same angle?
 
Is your battery nearly at full capacity? Charging current goes way down when the battery nears 100% SOC.
The two MPPTs operate independently. Even if one is charging at full power, the other one could have slowed down. This happens consistently on my EG4 6500EX when the battery is at 100%. MPPT1 still charges at 2200W and MPPT2 slowed down to 300W.
 
You must log in or register to reply here.

Similar threads

H
(6) 100 watt panels with 40a MPPT charge controller in 3S2P?
Replies
10
Views
1K
H31ST
H
chrisski
More Panels in Series for More EarlyProduction
Replies
2
Views
491
12VoltInstalls
12VoltInstalls
TheCoachStone
Finally ready for Panels LV 6548
Replies
11
Views
646
jasonhc73
jasonhc73
T
2S3P or 3S2P or something else? - Please help! [Serial & Parallel with plenty of room in the MPPT]
Replies
8
Views
934
TaiPan
T
melbaylon
Mix 150W and 170W solar panels
Replies
9
Views
776
740GLE
7
Back
Top