Under performing solar panel.

wingnut771 said:
Not sure but I found a cheaper controller:
View attachment 1691085

Takealot.com: Online Shopping | SA's leading online store

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Click to expand...
This one have a 650w max input power

sun-solar-mppt-12-24v-dc-50a-charge-controller-743_1080x.jpg

solarwarehousesa.com

Solar Warehouse SA

Solar Warehouse SA
solarwarehousesa.com solarwarehousesa.com
 
BBSA said:
I think this is what I need: https://www.livestainable.co.za/pro...hIIJyUUvlFJWFdKABfP_5UBtH-YMJ0jhoCiDoQAvD_BwE
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Those are battery cables specced for inverter load. 16mm² can handle 70A.
1713173869215.png
1713173918613.png
www.fabhabs.com

DC Cable Size Calculator | Fabhabs

Easy calculator to size DC cables based on their length, current, and citcuit voltage. Ideal for 12V and 24V systems such as campers, van conversions, and solar projects. Need to know how thick a cable needs to be for a solar panel, fridge, battery, or motor? Use this calculator to find out.
www.fabhabs.com www.fabhabs.com

Nothing wrong with overspeccing though. Just make sure lugs are hydraulically crimped to expel all the oxygen.
 
He dives in to panels a bit which might be interest to you -

BBSA said:
I have a new Canadian 460W mono solar panel, but it only produces about 200W during midday. I'm located in Pretoria, and the panel faces north at a 27-degree tilt. I'm using an 8-meter long, 6mm cable to connect it to the inverter. While I understand I won't get the full 460W output, I expected to see production closer to 300-350W at midday.

Is this an unreasonable expectation for the panel?

Here is the link to the panel: https://www.geewiz.co.za/solar-pane...ower-mono-perc-hiku-with-mc4-evo2-silver.html
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BBSA said:
The once with came my current inverter.
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You could use a 4mm it can do 30A

you have to remember there is two sides to an mppt the panel side will operate at panel voltage and panel amps ie the 13.?? Amps max of panel

So even thinner cable would be fine , though i haven't seen anything else other than 4/6mm solar cable


From the mppt to the battery it changes as that is where the conversion happens

So thin cable from panel to mppt thick cable from mppt to battery

So from mppt to battery the amps will be max at flat voltage
So you size the cable for max amps at flat battery so lets say it gets down to 10v the 440w will be pushing 44A or whatever the max of the mppt is
 
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Rickster said:
50W more!?!?!?!

That is crazy my dude.
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Not really i have seen 1000w more than rated in ultra cold conditions on a cloudy day

At the time i had 3190w array and saw 4200w

So cold wind panels was cold mid day clouds rolled away exposing panels to full sun while
Super cold
 
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