Wiring Solar Panel Array


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Greetings, all.

I'm setting up an off-grid solar panel array. The panels are about 170' away from the enclosure housing the inverter/charger and batteries. For minimal voltage loss, I am using 1/0 XHHW cable for this run. I have a 500' spool of wire, but of course that won't be enough. My question: can this cable be spliced underground safely?

Thanks
 
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A bit late to the party here, but
are you doing conduit? by default xhhw is not "direct bury"
XHHW and XHHW-2
XHHWXHHW-2
X = Cross-Linked Polyethylene (XLPE)
HH = High Heat-Resistance
W = Water Resistance
Temp Rating:
90° C in dry locations and 75° C in wet locations
X = Cross-Linked Polyethylene (XLPE)
HH =
High Heat-Resistance
W =
Water Resistance
Temp Rating:
90° C in both dry and wet locations


conduit of course still requires water resistance as it's considered "wet" because it usually gets wet.

There are plenty of "submerged" splice connectors, but in conduit or not makes a big difference
 
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A good solution would be to bring the splice out of the ground. A 4”X4” fence post could be buried at the union and the adjoining wires brought up well above any potential water level. Fasten a waterproof electrical box to the fence post and join the wires in the box. This would preclude any chance of moisture invading the joint.
 
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These wires will be in conduit. I guess I can do as Silentrunning suggests and bring the splice aboveground, but it will complicate the installation somewhat.
 

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