One of the most promising solar electric options is gaining support around the world. These plug-in solar systems are often called “balcony” solar systems. They are small photovoltaic systems that have built in control systems and an inverter that takes the power up to grid voltage (110-120V in the US).
Installation is simple, place or mount panel in the sun and then plug in to an electric outlet. These systems provide low cost solar that is personal and can be unplugged and moved to a new apartment or home. A renter can invest in solar! Permission from the landlord may be required and local building codes may be non-existent, easy or difficult.
Balcony solar is particularly appealing in areas where most people live in apartments with balconies. Some areas restrict the size to 800 watts, but others allow up to 2250 watts. The cost per watt is generally about half that of a large rooftop array. Most feed direct to the grid but some opt for battery storage as well.
A 500-watt solar panel setup might use one to two 12V 100Ah lithium batteries (or two to four 100Ah lead-acid batteries) to provide adequate for moderate, daily off-grid use.
The grid is easier, but it is not quite as simple as that because the grid has to be set up to accept the power. Some utilities are stepping up, but others are resisting the move. In addition, there are likely to be issues with homeowners associations, city, state and perhaps national rules. In the US, some systems are now offering compliance with the National Electrical Code (NEC) for safety. In 2025 Utah became the first state to support balcony solar. But other states are getting started.
Germany was the pioneer in adoption. The German government enacted the first technical regulations for plug-in solar devices in 2019, and now over 1.5 million systems are in use, supported by streamlined regulations. Renters have some rights to install these systems and neighbors cannot block their use. During the first six months of 2024 200MW of balcony solar were installed. Cities throughout Germany, including Berlin and Kiel, have offered millions of euros in subsidies to encourage installation of balcony solar.
Sunny Spain is adopting these mini-systems as well. In 2026 the UK government committed to legalizing plug-in “balcony” solar. Today 25 of 27 European Union member states approve the systems — only Belgium and Hungary don’t. China is seeing an increase in interest, installations and manufacturing capability.
In sun-drenched parts of the world a single 400-watt module can generate up to 800 kilowatt-hours (kWh) of electricity per year, almost twice as much as in Germany. With energy costs of $0.50 per kwh (current San Diego price) that represents $400 a year.
Balcony solar is gaining support in the Middle East and other areas but regulations can be burdensome. A 1,170 W system in Jordan can generate approximately 800–900 kWh per year.
The Ministry of New and Renewable Energy (MNRE) in India now permits Central Financial Assistance (CFA) for balcony solar under the PM Surya Ghar scheme. Brazil is getting started as well, even in the favelas.
Balcony power is a winning solution. Consumers are ready and willing, but regulators, energy providers and architects have to embrace it and get out of the way. Stealth installations are increasing in the US but may lead to liability problems.
Costs vary from €400-1200 with a payback in just a few years. Why not give it a try? First, make sure it is legal and supported by the grid operator. Look for an experienced retailer, quality system, and consider an installer to make sure the mounting is secure against high winds, snow, and rain and that the wiring is protected from pets and children.
