diy solar

diy solar

My little set up

rlwilson730

New Member
Joined
Jun 27, 2020
Messages
22
Location
Fort Worth, Texas
I built this just for fun, then I realized this can cost money. But any way, I have a shed (7'x7'x'9) for storage and a green house (6'x6'x8'), I ran some power to both, with 2 40w fans to more the air. I won't be running a lot or watts but I want it there just incase I need a little more power. Here what I did.. I have
List of what I have:
8- 100w Renogy Solar Pannels

Rover Li 40 Amp MPPT Solar Charge Controller​

2000w power inverter
4- 12v 100aph Batterys @ 24v output 2 in series then parallel to get 24v and 200aph


The last picture is how I have it all set up.

The question I have @24v battery & Solar Pannels am I at max pannels with a 4o amp MPPT? I don't want to be 100% max but in the upper 80s or low 90s % can I run 2 more pannels and if so, how to hook them up to get at that 90%

Right now with the sun and my pannels, I'm at 80-88v output

Thanks for any help...
 

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Last edited:
40*24 = 960W, but you'll be maxed out. Note that the amount of time a panel/SCC provides maximum power is rarely/never as other conditions often prevent more than 80-90% yield. Also, running SCC at peak shouldn't be a problem.

It's also common to over-panel SCC with more than they can handle to allow for higher peak output for longer periods - the extra is just clipped off.

You could handle two more; however, you would need to reconfigure for 2S5P as 5S2P would blow the SCC voltage limit.
 
You could also run 3S3P by adding one more panel. That would give you 900w max, ~60V ~18a, all well within tolerance. You could probably even add three more (3S4P) and just face the last three to a west to pick up the later sun, but that would exceed the tech specs on paper.

1615324854255.png
 
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