Backyard Solar Project: Maricopa Arizona

Design Objective:

-Gain some experience in designing and building a small 12 DC solar power system 
-It should have the capacity to supply 12volts @ 4 amps for several hours each night: 356 days/yr
-It should be maintenance-free



50W panel mounted in obscure part of the side yard
 

Two 75 Watt LED strip floods
mounted behind fascia illuminate  the patio



Final checkout and hookup at solar panel.

The idea was to run the yard 3Volt LED  landscape lighting and a couple of LED patio floodlights off of a medium sized 50W solar panel and a good quality battery pack. The Landscape lighting had to be photocell controlled and the voltage had to be regulated 3Volts
 

Battery Box
Two Li-ion motorcycle batteries connected in parallel and a 10Amp fuse



 Original idea
Was to keep the battery box near the solar panel
Bury the wires and half the box
 

 



30 ft wire-run to junction box
12Ga heavy duty direct-bury landscape wire

 



We looked at mounting the panel at an angle and then settled on a vertical mounting on the concrete wall.
It seemed easier and more trouble-free
 



Ace Hardware
sells these nifty concrete anchors with 1/4-20 threads



Original idea
Outdoor-type battery box with the solar controller mounted in the lid
It was decided to move the battery pack and controller 30 ' and nearer to the load and take the "hit" on solar charging current.
 

 





Configuration 2

Solar controller and 12V distribution in upper half of pool power panel. Note the 3 Volt voltage regulator and photoelectric switch for landscape lighting upper right
It's not good practice to do this so we were careful to make sure low voltage wiring is strictly separated into the upper half of the panel
 

 



Battery box with in-line 10Amp fuse
sits behind pool electrical box



Final mounting scheme
Has full sun for 8hrs/day
 





Schematic Diagram
 



Pair of automotive strip-type LED floods
These two pulled 3.5 Amps and put out plenty of light on the patio
 



Solar batteries also power the six 3 Volt LED landscape floods dusk to dawn.
 

 



New panel on wall in background replaces the two home depot solar panels with integrated battery packs.
After 3 yrs, these panels had begun to lose their effectiveness.
 

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1/15/19C