Baltimore resident Craig Keenan said saving money was only part of why he installed one of the smaller Bright Saver models on his balcony in July.

“I’m interested in renewable energy because the amount of carbon emissions that we produce as a species is very, very unsustainable for our world,” he said.

He said he expects the system will save him about $40 per year on utility bills, so it would take him about 10 years to recoup the cost of the kit.

These small-scale solar systems could become attractive to more homeowners now that President Donald Trump’s sweeping budget-and-policy package will scrap residential rooftop solar tax credits and may shift interest to cheaper alternatives. Even before the GOP bill passed, manufacturers of the smaller systems known as plug-in or balcony solar were seeing increased demand and other positive signs such as a new Utah law streamlining regulations for homeowners to buy and install them. The systems about the size of a door haven’t been as widely adopted in the U.S. as in Europe because of lack of awareness, patchwork utility rules and limited availability.

Keenan, a mechanical engineer, said installation took him 10 to 15 minutes.

“I think anyone can install this,” he said. “It’s not complicated. It doesn’t require a technical degree.”

Other companies selling plug-in solar kits include Texas-based Craftstrom. It has sold about 2,000 systems in the U.S. since 2021, mostly in California, Texas and Florida. The company's basic kits contain a solar panel that can fit in a backyard or other sunny space, along with equipment to maintain and regulate the flow of energy including an inverter and smart meter.

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