For decades, “rooftop solar” has equated to a major rooftop transformation and a significant financial commitment. It’s also been largely limited to wealthier homeowners, though even they could be stymied by solar-hostile HOAs, municipalities, or utility companies.
Plug-in solar, often referred to as “balcony solar” is a new mode of solar installation that could start to change that in a big way. Plug-in solar refers to a small scale (<1.2kW) solar array that can be purchased retail and is designed to be set up as a temporary installation, often being hung over a balcony rail or set up in a backyard by the purchaser. These panels connect to a small inverter (which may have an attached battery) which is then directly plugged into a wall outlet in the home.
Historically, plug-in solar systems have been illegal (and were also considered unsafe). This year, 10 states, including California, have passed legislation legalizing plug-in solar, and the UL 3700-based testing and certification framework was established in January of this year. Although the specifics vary by state, the legislation generally limits plug-in solar systems to 1.2 kW (most retail systems currently available on the market are around 400 W, or 0.4 kW) and allows them to be used without a signed interconnection agreement with the utility company. However, system owners are still required to notify their utility company of their intent to install and use a plug-in solar system, and the systems cannot export electricity to the grid. Additionally, most states’ plug-in solar legislation includes provision limiting, or in some cases outright prohibiting, landlords and homeowner associations (HOAs) from preventing residents from installing these systems. For state-specific details, see the
“Plugin Solar Legislation Tracker.”
Residential solar has an entry-point problem; plug-in solar may be a solution
Rising household and utility costs are giving consumers more reasons to look for ways to take greater control over their energy use and expenses. With systems starting as low as $800 for a 400-watt setup, plug-in solar creates a lower-cost entry point for consumers that traditional rooftop solar doesn’t serve.
For installers, that means it shouldn’t be viewed as a competitor to rooftop solar. It may be better understood as an on ramp to a much longer homeowner renewable energy journey.
Residential solar doesn’t have a demand problem so much as an entry-point problem. Our latest Solar Snapshot report found that 71% of homeowners have at least some interest in solar. But interest doesn’t necessarily translate into a viable rooftop project. Zooming out, it’s easy to see why.
For starters, the traditional rooftop solar market is only available to a limited pool of consumers, excluding renters, multifamily residents and households with unsuitable roofs. For many, going solar is out of the question entirely. And for those who do meet the required housing conditions, it’s not exactly a slam dunk. 44% of interested homeowners say solar is more expensive than they expected. We call that gap between expectation and reality “Cost Shock,” and it’s now the leading barrier to adoption in our research.
The expiration of the solar tax credit has raised the barrier even further. During the two decades the credit was in place, the U.S. solar industry grew by over 200x. Now, its absence has fundamentally changed how installers close a sale. Nearly half (49%) of interested homeowners say they can’t afford solar without tax credits, while 55% of installers now say third-party ownership is their most popular financing option and 65% expect it to represent the majority of their 2026 sales.
The result is a sizable group of consumers who are interested in generating their own power, but for whom the industry’s traditional entry point simply doesn’t work. New tools that let homeowners compare options, understand expected costs and savings, and explore solar before speaking with an installer can help make the process feel less opaque. Plug-in solar fits into that same broader shift by giving consumers more ways to engage with solar on their own terms, rather than requiring a full rooftop project, or signing risky-feeling financial agreements as the first step.
Not the end of the ride; Just another loop on the “Solar Coaster”
Currently the plug-in solar system landscape is largely direct-to-consumer, but I don’t believe that makes it the “Uber of Solar.” Yes, plug-in solar removes many of the traditional barriers to adoption, but there are a couple actionable ways for solar professionals to add significant value.
First, the impact of shading on solar panels is not always intuitive. People I’ve spoken with are always very surprised to learn that a single line of persistent shading (like the kind you might get from a nearby utility pole, or a balcony rail) could reduce the output of an entire array to nearly zero. Factor in other considerations like ideal tilt and azimuth, airflow for cooling, and the effects of debris on panel performance, and the case for a professional consultation on panel placement becomes pretty clear.
Second, plug-in solar is available to a wide swath of the population who cannot go solar for reasons other than the cost of a traditional system. Depending on your location, there’s a strong case for a “full service” plug-in system, where trained and trusted professionals still handle the installation, which can be a great option. It’s something I would have loved to have access to as a fresh-faced college graduate with a new job, but still renting!
From there, you’ve formed a new relationship with a customer, and a few lower energy bills may prompt them to start thinking more about where their electricity comes from, how much they use and how much control they have over it. A few years down the road, they may choose to buy a home and turn back to their trusted installer for a full-scale rooftop solar project, or EV charger install. That trust matters: 54% of homeowners interested in solar cite technical expertise as a top factor in choosing an installer, alongside warranties and customer reviews.
For installers, the opportunity starts before the rooftop
One of the things I’ve learned from studying solar consumers is that the first energy decision rarely happens in isolation. Someone who starts with a few panels on a balcony today may be the same customer considering rooftop solar, battery storage or an EV charger several years from now. Of course, not every customer will follow that path. That’s not really the point. The point is that plug-in solar creates an opportunity to introduce more people to solar energy and establish relationships that can grow alongside their energy needs, early.
The 2026 Aurora Solar Snapshot also revealed that utility bill savings and energy independence remain a primary motivator for going solar, consistently outranking environmental impact for the last four consecutive years. Plug-in systems, which have a typical payback period of two to five years, are a great first step on the path to utility savings. With the majority of the country seeing utility reductions of up to $400 per year for a 1,200-watt plug-in system, balcony solar installations can open the door to additional home electrification improvements.
And, not every plug-in customer will become a rooftop customer, of course. In a post-incentive market, the most resilient installers will be the ones that can meet customers at more than one point in their energy journey. Plug-in solar lowers the threshold for that first purchase and gives more opportunities to build relationships and trust. It may be a much smaller system, but for installers willing to think beyond the traditional, it could be the beginning of a much bigger customer relationship.
By Fox Swim, Senior Solar Industry Researcher
This content is protected by copyright and may not be reused. If you want to cooperate with us and would like to reuse some of our content, please contact: [email protected].
Comments
Please login to comment
the UL 3700-based testing and certification framework has yet to be adopted by manufacturing to even produce and sell the systems. The California “Balcony Solar has a “Sunset Clause” in jut 3 years. After that, even the UL3700 plug in 120-volt systems could be outlawed because Utilities want 220-to-250-volt solar AC input at the meter, not 120 Volt. Phase A to Phase B is 240 volts and Phase A or Phase B to the grounded conductor is 120Volts and that is not the Transmission voltage required by Utilities for NEM2.0 or NWM3.0 in California. A smart customer could connect 600 watts to Phase A and the neutral and 600 Watts to Phase B and neutral with two separate balcony solar systems but then the design and cost just doubled.
A better system you can use one thousand watts of solar panels to charge a 5kwh battery (rack battery) through a hybrid inverter (inverter plus charger) or a PSPS, you can then use a 200w micro inverter for 24 hours (24hr*200w= 4800wh)…to reduce base electric load use and with the hybrid inverter or a PSPS, you have access to power in a blackout!!!
OR you export the 1000w onto the grid FOR CREDIT!!!
To make any decisions you need to live monitor your house electric use with a whole house monitor like Emporia Via monitor for $200
I built just a system, and I could vary the on-grid output from the batteries based on need. All the parts are available on E-bay, but they do not meet the UL3700 testing and only have CE testing certification from China. But that required a very large battery-based system, and the weight and cost was in the tens of thousands of dollars like a 4 Power wall combined system. Simple is better. The Dryer 30 amp 240 volts plug in the garage or laundry room with a Fused “y” connector would be better but that is NOT what is proposed.
Currently Plug-in solar has five major problems causing you not to benefit…. NO Netmetering (you don’t get any credit and why give the power company FREE power???), kits don’t come with battery option (work only during the day), only benefits half of your house because you only connected to 120v (what about the other side of your 240v split phase house) so you actually need to purchase TWO kits to cover your whole house, one way smart meter on your house (current going in either directions reads only as consumption, you will be paying a bigger bill because of exporting), and kits with inverters that can not do ‘zero export mode’….
CALL YOUR REPRESENTATIVE AND DEMAND CREDIT FOR EXPORTING PLUG-IN SOLAR!!! All the above issues would be solved only if you get credit for exporting!!!
One solution is Portable, Powerful, Plug-In Solar: GismoPower patented a plug-in, 5Kw EV-charging carport, the MEGA® (“Mobile Electricity Generating Appliance”). Shade & Charge while generating electricity for homes, small biz and renters. Solar on Wheels® won the American Made Solar Prize & federal grants.
Please Email it to the Secretary of the Standards Council at [email protected]
We have an editorial in today’s issue of PV Magazine:
Email it to the Secretary of the Standards Council at [email protected]
Cheers,
http://www.gismopower.com
Monday, November 2, 2026
4:00 pm – 5:00 pm CEST, Berlin, Paris, Madrid
Thursday, November 5, 2026
10:00 am – 11:00 pm CEST, Berlin, Paris, Madrid
Thursday, October 29, 2026
11:00 am – 12:00 pm CEST, Berlin, Paris, Madrid
Missed pv magazine USA Week 2026?
Catch up on three days of expert discussions on U.S. solar manufacturing, distributed energy, and solar-plus-storage.
You have no items in your basket.
