Solar Parallel problem?⚠️

[YukIi]

I have 2 Solar panel with d same spec's but the Solar A is my old panel And Solar B is a new One.
-But my scc disappearing my charging current if i connect my solar panel in parallel?
But i tried Series Connection and it's going fine.?

I tested all my solar panel individually and all fine.

Solar A
Vmp-22.32v
Imp-2A+

Solar B
Vmp-21v
Imp-2A+

can you figure out the problem??

Picture Below ?? is series connection.

 

[Rednecktek]

I'm assuming you're running a 12v system with this? SCC's usually need 3-5v over the charging voltage of the batteries, so a LFP asking for 14.6 could need 17-19.6v from the panels under load to charge. When the panels start having to work the voltage drops a bit as the load is applied (this is normal in electricity) so your incoming power may be down to 16.2v (33.5 you're showing / 2 panels) for example which is jjjuuusssttt under that minimum requirement and thus not charging.

I'm using example numbers to explain the concept, I'm not sure exactly where yours are, but I've seen it happen quite a few times over the years, especially when you have less than absolutely perfect direct sun.

When you connect in series you're right there at that minimum and then add a whole 'nother panels worth of voltage so the SCC has more than enough to get the job done.

At least that's my suspicion from experience.

 

[YukIi]

I'm assuming you're running a 12v system with this? SCC's usually need 3-5v over the charging voltage of the batteries, so a LFP asking for 14.6 could need 17-19.6v from the panels under load to charge. When the panels start having to work the voltage drops a bit as the load is applied (this is normal in electricity) so your incoming power may be down to 16.2v (33.5 you're showing / 2 panels) for example which is jjjuuusssttt under that minimum requirement and thus not charging.

I'm using example numbers to explain the concept, I'm not sure exactly where yours are, but I've seen it happen quite a few times over the years, especially when you have less than absolutely perfect direct sun.

When you connect in series you're right there at that minimum and then add a whole 'nother panels worth of voltage so the SCC has more than enough to get the job done.

At least that's my suspicion from experience.

Thank you ? i really appreciate your advice ?