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“Are you parking this in the sun?”
Photo Credit: iStock
A New Yorker trying to size an off-grid solar setup for a window AC unit that would support a walk-in cooler nonstop from May through September went to Reddit for advice.
Commenters said the bigger variable may be the cooler’s construction, not the panels themselves.
Saying they were “new to solar and just looking for help with the math and what size I would need,” the poster asked about powering a 10,000-BTU window air conditioner with a CoolBot in an off-grid New York setup.
They said they had a converted trailer “about 8ft deep x 6 wide x 5 high,” with “3-inch insulation all around.” They said it “runs well when plugged in,” but needs to move to “a new property that doesn’t have power.”
Insulation seemed to be a big factor. One responder, describing themself as a commercial refrigeration teacher, wrote, “Three inch insulation is somewhat inadequate for a cooler. Industry specs start at four and can be thicker depending on a lot of factors.” 
The same commenter added that, depending on heat gain, the unit could run “20-30 minutes per hour on average.”
The Redditor’s case is more of a DIY setup, but for others looking to go off-grid or hybrid off-grid (ability to run the house in a power outage) with rooftop panels, that kind of solar setup can be one of the best ways to save money on home energy over the long run. Readers comparing options can use EasyHome‘s free explorer tool to see pricing and savings from vetted installers in their area, with most installers able to offer battery storage as well.
One commenter said a cooler operating continuously for five months should probably be sized component by component. 
With energy prices through the roof, there’s never been a better time to go solar — and EasyHome can help you find the best prices from the best installers in your area.
EasyHome takes the guesswork and headaches out of energy upgrades by showing you estimated savings from a network of vetted local partners. To get started, just enter your ZIP and share a few details about your home — seeing your estimate is really that easy.
“I would do the calculations and buy the components to build it rather than trying to find a kit,” they wrote.
The same reply suggested the storage side could be enormous, saying the system might need “like a Tesla power wall or something huge like that.” In other words, battery capacity could matter as much as the panel array.
Construction details and placement could also change the answer significantly. The refrigeration teacher warned that studs can “move a lot of heat into the space,” and they also asked, “Are you parking this in the sun?”
What looks manageable on the grid can become a far pricier solar job once nonstop runtime, battery needs, direct sun, and modest insulation are all part of the calculation.
Before picking equipment, commenters suggested getting real-world consumption data. Rather than estimating only from the 10,000-BTU rating, one recommendation was to meter the window unit for several days and see how much electricity it actually uses.
The commercial refrigeration teacher also pointed back to the trailer itself before any solar sizing happens. That means reviewing the 3-inch insulation, checking whether the floor is insulated, accounting for heat moving through studs, and considering whether the unit is parked in full sun.
For anyone trying to price solar for a more expansive load like than a more DIY setup like this cooler would take, EasyHome‘s free explorer tool can help make sense of local pricing, savings, and installer options without locking you into a one-size-fits-all kit. 
Pairing solar panels with a battery also allows homeowners to maximize savings and power their home when the grid goes down. Sites like EasyHome allow you to curate competitive bids from local installers without sharing contact information unless you decide to move forward.
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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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