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“I know the AC unit is a big drain so that is optional.”
Photo Credit: iStock
A homeowner in a rural Southern area turned to Reddit’s r/SolarDIY community with a practical question: Could an off-grid solar backup system meant for long outages be built for less than $10,000?
The replies suggested that it could, but only if the plan was built around more modest backup goals, especially when it came to battery capacity and running air conditioning.
In the Reddit thread, the original poster said they have strong sun exposure where they live and are interested in backup power for resilience, not for lowering monthly electric bills. They wrote, “I want something that can allow us to run our electronics, lights, fridge, freezer, and ideally the AC unit. I know the AC unit is a big drain so that is optional.”
OP then asked the forum, “Is this a pipe dream? Can this be done? … Can I safely do this for what I’m able to spend?”
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With household consumption at about 1,500 kilowatt-hours each month, the proposed project moves quickly into costly territory if the aim is to cover everything off-grid. In the thread, one commenter said a full day of usage would ideally require “at least, 54kwh” of battery storage.
That commenter also sketched out a possible equipment mix, with about $1,000 for a 12-kilowatt inverter, roughly 7.5 kilowatts of solar based on four solid sun hours per day, and around 30 kilowatt-hours of batteries for about $4,400.
The top comment provided a more negative outlook, adding, “Off-grid, with battery backup … you’re never going to be able to achieve that with a $10k budget.”
The main challenge for OP was that whole-home backup and basic emergency backup are not the same thing. Running lights, electronics, refrigeration, and a few outlets is one target. But adding central AC, especially during an extended outage, can dramatically increase the size and cost of both the battery bank and the inverter.
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If the goal is safety and comfort rather than maintaining business as usual, a smaller battery setup, potentially closer to 20 kilowatt-hours, could make more sense than designing for full daily usage.
Still, adding battery storage to a solar setup is one of the best ways to protect your home during outages, save money on energy, and go off-grid. It also gives homeowners more control over when and how they use their solar power. If you want to compare options, EnergySage offers information about home battery storage, including competitive installation estimates.
If you’re thinking through similar backup-power tradeoffs, these stories look at how other homeowners handled batteries, outages, and off-grid living. 
• Homeowners said battery backups made outages easy to miss after one husband’s off-grid upgrade.
💡Go deep on the latest news and trends shaping the residential solar landscape
• During a long storm outage, one home battery saved them through 48 hours without grid power.
• In Utah, Rocky Mountain Power customers could get money to install home backup systems.
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© 2025 THE COOL DOWN COMPANY. All Rights Reserved. Do not sell or share my personal information. Reach us at hello@thecooldown.com.

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