Epever Tracer 40a Over Panelling

Famous_addit · Oct 11, 2022

Hi All,

I read the guide on over panelling common MPPT controllers and I have a quick question.

The guide / charge controller says a max over panel of 780w @12v for the 40a model.

I assume I would be fine with 8 x 100w panels as they're unlikely to ever be over 97.5% efficient. Any issues with this assumption before I plug them in?

Also, what are people's preferred config for 8x100w panels? I was planning on connecting them 2 in series, 4 parallel.

Thanks in advance.

sergea · Oct 11, 2022

what is your PV Voc ?

DThames · Oct 11, 2022

Read and understand the manual. Note the conditions below. Read more and see that more panels suggests wasted capacity but because the controller will current limit and power limit, you can really pile as many panels on as you desire, keeping safely under Voc limits.

Browneye · Oct 11, 2022

That could work. You might also consider facing pairs east or west to take advantage of early/late sun, or to work around shading.
Just don't over-volt your controller - that will smoke it.

DThames · Oct 11, 2022

Curious about the 100w panel size, is this an RV or other space limited setup? Once you get to hundreds of watts, large 300watt range panels are a lot more cost effective.

Famous_addit · Oct 11, 2022

sergea said:
what is your PV Voc ?

I'm currently running 4 panels, 2x 100 w in series and parallel. Panel V is 12v, so if I've worked it out correctly. Voc should be 24v?

Famous_addit · Oct 11, 2022

DThames said:
Curious about the 100w panel size, is this an RV or other space limited setup? Once you get to hundreds of watts, large 300watt range panels are a lot more cost effective.

Combination of OCD I'd like them to match haha, though this is not really an issue. It's more ease of availability, I can get 100w from amazon delivered tomorrow.

sergea · Oct 11, 2022

Famous_addit said:
I'm currently running 4 panels, 2x 100 w in series and parallel. Panel V is 12v, so if I've worked it out correctly. Voc should be 24v?

Voc is available on your panel sticker , you need it to know how many panel in series, since you must respect total Voc <= 100V @25 C°, better not to go over 80V C° to be safe with this SCC.

sergea · Oct 11, 2022

you can put as many panel in series as long as Total Voc <= 80V , so you need to know what is your panel Voc. check the sticker.

Epever Tracer 40a Over Panelling

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