Input solar panel little to high.

Patrol · Mar 16, 2023

Hi, my 3 panels deliver 100.9 Volt, my Epever 30 A says it's to high...warning because 100V is max. How can I solve this little problem? Can I blind a part of the solar panel?

Best regards, Willem

Mattb4 · Mar 16, 2023

You need to change the number of panels wired in series. Take the Voc of each panel and add them together when in series and it must be less than your SCC max Voc rating.

Patrol · Mar 16, 2023

Mattb4 said:
You need to change the number of panels wired in series

Can I cover a panel slightly so that it has less yield?

Mattb4 · Mar 16, 2023

Patrol said:
Can I cover a panel slightly so that it has less yield?

No. That is not a good solution.

Sean Very North · Mar 16, 2023

Upgrade the charge controller.

LydMekk · Mar 16, 2023

Take away one panel.

blammo585 · Mar 16, 2023

Not much wiggle room. 0.9 volt and it shuts the controller down?

Hogheavenfarm · Mar 16, 2023

At least it is shutting down, not sending smoke signals...

MichaelK · Mar 16, 2023

What is your battery bank size/voltage? Another alternative is to buy one more identical panel and wire them 2S2P. You'll get lower voltage but higher amperage. What's the wattage of the panels you have now?

Quattrohead · Mar 16, 2023

Put a few diodes in series with the panels, each diode will drop 0.6 volts.
Make sure they are rated for the current.

timselectric · Mar 16, 2023

If you have room for a fourth panel. Go with 2s2p.
If not, remove 1 panel. It will only get worse in colder weather.
Consider yourself lucky that you got a warning.
There's no way to put the magic smoke back in.

MisterSandals · Mar 16, 2023

Quattrohead said:
Put a few diodes in series with the panels, each diode will drop 0.6 volts.
Make sure they are rated for the current.

Have you ever heard of anybody doing this?
If so, I’d like to hear the implementation details.

Patrol · Mar 17, 2023

blammo585 said:
Not much wiggle room. 0.9 volt and it shuts the controller down?

No, it not shuts the controller. Only the warning light flash, but in full sunset it stops and the voltage is 98 volt.

Patrol · Mar 17, 2023

timselectric said:
If you have room for a fourth panel. Go with 2s2p.
If not, remove 1 panel. It will only get worse in colder weather.
Consider yourself lucky that you got a warning.
There's no way to put the magic smoke back in.

I have a fourth panel and also room for installation. Good idea!

Patrol · Mar 17, 2023

Can I connecting 2 in serie and connect parallel with other 2 in serie?

TorC · Mar 17, 2023

That is correct, and exactly how you do it. Given the lower output current limit of your Epever SCC, it's possible separate overcurrent protection would be advisable, depending on what your SCC input Isc (short circuit current) limit is - it won't pull more than it can take, but in the event of something going wrong it may not be designed to protect against it internally.

ETA: If you haven't already removed one of those panels, do so now. Be very glad you haven't let the magic smoke out, because you are extremely close to doing so.

timselectric · Mar 17, 2023

Patrol said:
Can I connecting 2 in serie and connect parallel with other 2 in serie?

Yes

Patrol · Apr 2, 2023

Done! at this way. Works perfectly, low voltage and more current.serie/parallel

Patrol · Apr 2, 2023

What are the most effective setting for the controller? I have MT50 remote.

Thanks, in advance.

MichaelK · Apr 2, 2023

Patrol said:
What are the most effective setting for the controller? I have MT50 remote.

Thanks, in advance.

Check with your battery manufacturer's recommendations.

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