By the way …
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Yes, I noticed you have a smart shunt. What is the current reading with the array connected and with it disconnected and is it still connected the wrong way around?
Sorry Stefan, I thought I was replying to toffifee.
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If a Smart Network is set up here, it also gets completely wrong values …
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Yes, it might cause some interesting results but I don’t think the Smart network is being used here. Still, the SOC will be completely meaningless.
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MPPT earth connected to Lynx distributor earth. Just as victron’s mamual suggested to do. And it is damn thick earth cable. 35mm2.
Will disconnect it tomorrow and will make a photo.
Smart Shunt…yep. I think it’s connected the wrong way. You are right. And yep, it’s still like that.
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Seems the shunt is not connected properly? Wires are reversed?
Ah…I set it up already. But I delete it now. I don’t want them to talk to each other…at least for now.
The cables are long enough to replace it without having to turn it 
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Nope.
I am on holiday. No extra cables are with me so I need to turn it around and won’t see the nice blue lights anymore.
Yep. We’ve just noticed. Kev finally found some mistake made by me.
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I think that was Steffan’s find.
Have you ever measured and compared the voltages of the individual panels? Where and how are the panels connected to each other on the roof?
Ooops. Oh yeah. He did. It’s too late.
No, because even though I’ve built the whole system alone, but I have no clue how to do that with the voltmeter.
At the moment they are in series. All three. But before it was like on the left drawing in the beginning of the whole post. And soon will change again. My new 100/50 MPPT arrive on thursday. Then in few weeks the 4th panel as well and will go again in series/parallel. I really try to find the right one for me.
But in the meantime I’ve realized that my ‘tiny’ panels will hardly charge this huge, 280Ah 12V battery. Some yputube guy show it how to calculate it. It was another devastating news.
You must disconnect all panels once and measure them individually. A multimeter always belongs in the vehicle. In sunshine, all panels should have almost the same values. If they are connected together, you will never find the fault.
One more thing … What is the cable doing on the MPPT?
I’ve tried to measure them 2 days ago individually but I didn’t understand the reading on the voltmeter. So I sat on the roof and was scratching my head. I don’t know how to use it. I am still a woman…you know.
It has red end, but it’s the earth. And it is connected to the earth on the lynx distributor.
You are measuring a direct voltage “DC”! … so the measuring device must be set to DC. Measuring range up to 20V or one size larger. So no magic.
Red voltmeter wire goes to the male mc4 and the black goes to the female MC4, yes?
And it should show 23,9V as it is on the panel’s specifications? Or?
The direction wouldn’t matter … then there would be a minus on the display … only the value is important … and that it is the same for all 3 panels …
When idling without load, they should manage 20V … in the sun … it’s night here
Ok. Will try to measure them as soon as I can. Your guess is a faulty panel maybe?