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“Wherever possible, you want to make your longer runs at higher voltages.”
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In very cold regions, off-grid solar planning often comes down to where batteries can stay warm and how power should travel from a ground-mounted array.
On Reddit, a poster asked whether a 100-foot run made more sense as panel DC feeding a heated building or as a setup with AC equipment placed near the panels.
They wrote, “Live in a freezing climate (-20f), so outdoor batteries are not possible. 4kw array about 100ft from heated structure. Is it practical to run the DC from the panels into the building or just do AC coupled with inverter by panels?”
Users largely agreed that bringing DC to the building was workable. Some commenters supported that route, while others offered examples from their own higher-voltage or longer-distance runs.
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One user offered one of the clearest installation suggestions: “Run DC into the building. Underground in Schedule 80 PVC, and then in metal raceway on anything above ground.”
Other community members shared details of their own configurations to offer context. One contributor mentioned operating a 400V DC line over 50 feet, another described managing a 400-foot distance, and a third noted running 480V DC across 800 feet. Together, these examples show that 100 feet is a relatively standard distance for a well-planned solar installation.
Going solar is one of the best ways to save money on home energy, and homeowners can explore EnergySage to get free solar installation estimates and compare quotes.
Another theme in the thread was that the bigger issue is voltage strategy, not simply choosing DC versus AC. Since the original poster said outdoor batteries were not an option in that climate, one commenter focused on keeping the battery close to the inverter and using higher-voltage runs from the array when possible.
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They wrote, “Whether it is DC or AC is not the point. Wherever possible, you want to make your longer runs at higher voltages. If you are using a 48 V battery, you want the battery close to the inverter. If you run high voltage (200-500 VDC) strings for your ground mount, it is fine to run them 100 feet.”
Another commenter wrote, “For actually large distances like 300ft or 500ft it’s cheaper to buy an extra panel or two than to use thick cable. With DC the voltage drop doesn’t matter, only the total cost for the delivered power.”
Overall, the replies pointed toward keeping low-voltage battery connections short, using higher-voltage DC strings when the panel run is longer, and protecting underground and exposed conductors with conduit or raceway as appropriate.
If you are interested in home battery storage options, including competitive installation estimates, you can explore EnergySage. EnergySage’s solar map can help readers compare home solar costs and incentives.
💡Go deep on the latest news and trends shaping the residential solar landscape
The Reddit thread zeroed in on a very specific off-grid question: how to handle a long solar run when the batteries need to stay indoors in subzero weather. The articles below look at the bigger picture, from blackout protection to tax credits.
• In Australia, a 20kW home system made blackouts invisible and even produced a $545 credit.
• After three years, one business owner said having solar was worth it despite the upfront cost.
A 100-foot wiring run is just one decision in a much broader solar plan. Cold-weather performance, backup needs, project costs, and local rules can all change what setup makes the most sense.
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