Please verify my fuse size

Sonnyboy · Apr 16, 2023

Hi,
I have attached a drawing of the layout as I have it wired already.
Also attached is the data from panels.
4 100w Rich mono panels
2 200w Rich mono panels

EPEVER 50A MPPT Solar Charge Controller 12V/24V/36V/48V DC Automatically Identifying System Voltage Max.PV 150V Solar Panel Regulator (Tracer 5415 an)

I am thinking based on my wiring and the specs of the panels that I am getting 20.56amps in the house and 40.8 V Is that correct?
If not, please detail where I am getting it wrong.
Also, I am guessing I need a 20amp fuse in the noted location. Can you please check if that is right based on the data provided?
THanks

rodrick · Apr 16, 2023

You need to go up to a 25 amp fuse 1.25x20.56=25.7

one problem is running 3 strings with branch connections is not normally done without a combiner box or fusing individual strings and the way your drawing is showing the fuse placement it doesn’t cover one string

Sonnyboy · Apr 16, 2023

Oh right. I’ll move it down then to the next where all three lines will run through it. Thanks

rodrick · Apr 16, 2023

Sonnyboy said:
Oh right. I’ll move it down then to the next where all three lines will run through it. Thanks

They make a inline mc4 fuse unit with 3 strings you should fuse each string individually

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chrisski · Apr 16, 2023

Sonnyboy said:
I am thinking based on my wiring and the specs of the panels that I am getting 20.56amps in the house and 40.8 V Is that correct?

Appears you are doing 2S3P with mismatched panels. Amps will add up, but voltages will be limited to the lowest voltage string. To find actual voltage, multiply VMP by two and do the same for VOC for the lowest voltage panel, the 100 watt panel.

panels appear to match each other within10%, so that is fair. You’ll lose some power, but haven’t done the math.

Please verify my fuse size

Sonnyboy

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rodrick

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Sonnyboy

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rodrick

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Please verify my fuse size

Sonnyboy

New Member

EPEVER 50A MPPT Solar Charge Controller 12V/24V/36V/48V DC Automatically Identifying System Voltage Max.PV 150V Solar Panel Regulator (Tracer 5415 an)​

Attachments

rodrick

Free energy enthusiast

Sonnyboy

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rodrick

Free energy enthusiast

AIMS Power PV-F30 - Inverter Supply

chrisski

Solar Boondocker

Similar threads

EPEVER 50A MPPT Solar Charge Controller 12V/24V/36V/48V DC Automatically Identifying System Voltage Max.PV 150V Solar Panel Regulator (Tracer 5415 an)