Still no voltage...wiring wrong?
- Thread starter plr
- Start date
The drawing isnt helpful
Can you take a picture up your wiring?
Can you take a picture up your wiring?
plr
New Member
- Joined
- Sep 21, 2019
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- 66
Not sure what pictures of the wiring you are looking for.
My panels off to the left are connected to the panels to the right by a 15 ft wire that goes to MC4 that then goes 20+ft to the basement to my growatt
Do you think I might be losing all my voltage there?
My panels off to the left are connected to the panels to the right by a 15 ft wire that goes to MC4 that then goes 20+ft to the basement to my growatt
Do you think I might be losing all my voltage there?
For 4P3S
FIRST
Stack the three panels with wire from the "+" going to the "-" o the next. The way you have it now you have "+" to "+" of the next. Thats two one way streets pointing at each other-no where for the current to flow. If connected as per drawing you have the diodes pointing at each other so no current-no voltage.
Then after verifying that you have 4 sets with voltage then connect all 4 "+" together and "-" together.
FIRST
Stack the three panels with wire from the "+" going to the "-" o the next. The way you have it now you have "+" to "+" of the next. Thats two one way streets pointing at each other-no where for the current to flow. If connected as per drawing you have the diodes pointing at each other so no current-no voltage.
Then after verifying that you have 4 sets with voltage then connect all 4 "+" together and "-" together.
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Ampster
Renewable Energy Hobbyist
The best way I know how to check wiring is through a process of elimination. Start at the source of voltage and add one section of wiring at a time. Always check your assumptions. Or you can use continuity checks on wiring that is not energized. Often connections are likely culprits.
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I want a picture of the actual wires on your actual batteries and controller...
The drawing you have is very incomplete.
The drawing you have is very incomplete.
I will repeat again
If you connected the panels as per your drawing the series panels are wrong.
You have them pointed at each other.
Think of a street intersections with all the one way signs pointed towards the intersection-you can not find a way to drive out.
For series connection to stack the voltage
Connect the Positive terminal to the the negative terminal of the next panel
Then on the next panel the Positive terminal to the negative terminal of the third panel
Then Parallel off the Positive terminal of the first panel and the negative terminal of the third pane.
Your drawing shows you are connecting negative to negative terminal for your series connection.
That's two one way streets pointing at each other.
To drive a one way street it the arrow going to the tail ......next arrow going to the next tail.......and so on and so on...
You do not drive one way streets with arrows pointing at each other.
Your drawing does not allow current to flow as the series connections are wrong.
Current will not flow backwards through the panels so you middle panel is blocking current flow from the first panel.
.....and for added protection your last panel blocks the current from the middle panel.
Series connections go Positive to Negative-the opposite of how you have your series panels
Parallel connections go all Positives together, all Negatives together, just like you have it so that part is good
Flip the connections on the center panels of each of the four series, then you will have it right.
Minimal work that way as you only have to flip 4 x 2 = 8 connections....then BINGO
You will have voltage and current......
If you connected the panels as per your drawing the series panels are wrong.
You have them pointed at each other.
Think of a street intersections with all the one way signs pointed towards the intersection-you can not find a way to drive out.
For series connection to stack the voltage
Connect the Positive terminal to the the negative terminal of the next panel
Then on the next panel the Positive terminal to the negative terminal of the third panel
Then Parallel off the Positive terminal of the first panel and the negative terminal of the third pane.
Your drawing shows you are connecting negative to negative terminal for your series connection.
That's two one way streets pointing at each other.
To drive a one way street it the arrow going to the tail ......next arrow going to the next tail.......and so on and so on...
You do not drive one way streets with arrows pointing at each other.
Your drawing does not allow current to flow as the series connections are wrong.
Current will not flow backwards through the panels so you middle panel is blocking current flow from the first panel.
.....and for added protection your last panel blocks the current from the middle panel.
Series connections go Positive to Negative-the opposite of how you have your series panels
Parallel connections go all Positives together, all Negatives together, just like you have it so that part is good
Flip the connections on the center panels of each of the four series, then you will have it right.
Minimal work that way as you only have to flip 4 x 2 = 8 connections....then BINGO
You will have voltage and current......
Ok, I understand better now.
You have the panels wired parallel, so the growatt will never get enough voltage to charge your 48V bank.
You have the panels wired parallel, so the growatt will never get enough voltage to charge your 48V bank.
Draw the panels without wires., just a + and a -
Then understand to charge 48V, you need more than 48v, preferably 96v or better.
Then show us the data plate for your panels, unless you know all the numbers.
Then understand to charge 48V, you need more than 48v, preferably 96v or better.
Then show us the data plate for your panels, unless you know all the numbers.
Also realize that battery bank will only power that inverter for 2400Wh, I think you have a 5KW inverter, so... 30 minutes tops without sun. COMPLETELY depleting the batteries.
You need to wire them like this...minimally...
What maximum voltage can your inverter accept?
What maximum voltage can your inverter accept?
Yep, as I stated above
-SUPER your drawing will help plr understand better , he needs to flip the connections on the middle panel
so its + to - of the next panel
Since 24V panels nominal (~40 Volt open circuit) this will work if your controller is rated for >120V-not familiar with your Growatt specs so please verify first with the Growatt manual specs.
Also verify that the + wires are going the the PV+ terminal on the Growatt and - to PV-
