Buyer's Guide
What do you actually need?
A plain-English breakdown of every part in a plug-in solar system — what it does, whether you need it, and what you can skip entirely. Most kits come with everything in the first section already included.
You need these
almost always included in a kitSolar panel
aka PV moduleThe flat panel that converts sunlight into DC electricity. Most plug-in kits use one or two monocrystalline panels rated 400–800W each.
Why it matters: This is the system. No panel, no power. Size it to your state's legal wattage limit and available mounting space.
Microinverter
aka Grid-tie inverter, plug-in inverterConverts the DC electricity from the panel into the AC electricity your home already uses. Almost always included in a kit, sometimes built directly into the panel.
Why it matters: Solar panels produce DC. Your outlets need AC. Without the inverter, the electricity is useless to your home.
Mounting hardware
aka Railing clamp, tilt bracket, balcony mountHolds the panel in place at the right angle. Different types for different situations: railing clamps for balconies, ground spike mounts for yards, tilt legs for flat roofs.
Why it matters: A panel lying flat on the ground in the wrong direction generates a fraction of what a properly angled panel produces. Good mounting pays for itself in efficiency.
Output cable and plug
aka AC output cable, Schuko cable, NEMA 5-15 plugThe cable that runs from the microinverter to your wall outlet. Usually included with the kit. In the US, this terminates in a standard 3-prong NEMA 5-15 plug.
Why it matters: This is literally how the electricity gets from the panel into your home. No plug, no connection.
Optional — depends on your situation
Battery / storage unit
Stores excess solar power for use later — evenings, cloudy days, or grid outages. Products like the EcoFlow STREAM and Anker SOLIX are designed for plug-in solar setups.
When it helps: Without a battery, any power your panels generate that you're not actively using goes unused (it doesn't go back to the grid in most cases). A battery captures that excess.
Skip if: Skip it to start. A basic kit without storage still cuts your daytime electricity bill meaningfully. Add a battery later once you've seen how the base system performs.
Energy monitor / smart plug
A device that measures exactly how much power your system is generating in real time. Some kits include a companion app; others you add a third-party monitor like Emporia or Shelly.
When it helps: Not required, but satisfying — and useful for verifying the system is performing as expected. Helps you optimize when you run appliances.
Skip if: Totally optional. Your electricity bill will show savings either way. A monitor just makes it visible.
MC4 extension cable
A DC cable extension that connects between the solar panel and the microinverter. MC4 is the industry-standard waterproof connector used on virtually all panels.
When it helps: Only needed if your panel is farther from the inverter than the included cable reaches — for example, panel on a roof, inverter near an outdoor outlet.
Skip if: Skip unless your install requires more reach. Most balcony or window setups use the included cable length fine.
Tilt optimizer / sun tracker
A manual or motorized frame that lets you adjust the panel angle throughout the year or day. Motorized trackers are rare at this scale.
When it helps: Optimal angle changes with the seasons. In winter you want a steeper tilt; in summer, shallower. Adjusting twice a year can add 5–15% annual output.
Skip if: Most people skip it. Fixed mounting at ~35° is close enough. Don't add complexity if you want a simple setup.
You don't need any of these
These are rooftop solar requirements, off-grid concepts, or just myths. Ignore them.
Charge controller
not neededUsed in off-grid battery systems to regulate charging. Plug-in solar doesn't use one — the microinverter handles everything. Kits marketed at beginners sometimes confuse this.
Electrical panel upgrade
not neededPlug-in solar doesn't touch your breaker box. You're plugging into an existing outlet, not wiring into the panel. This is one of the main reasons plug-in solar is so much simpler than rooftop.
Licensed electrician
not neededNo wiring changes = no electrician required. Installation is closer to assembling furniture than doing electrical work. The certifications on the kit handle the safety requirements.
Permit
not neededMost states that have legalized plug-in solar explicitly waive permit requirements below a certain wattage. Check your state's specific law — but in the majority of legal states, no permit is needed.
Utility company approval
not neededIn legal states, plug-in solar below the statutory wattage limit can be installed without notifying or getting approval from your utility. The law grants this right explicitly.
Separate inverter
not neededIn traditional rooftop solar, the inverter is a large wall-mounted unit. In plug-in solar, the microinverter is built into or bundled with the kit at panel size. You don't buy one separately.
Conduit or wire runs
not neededRooftop solar requires running wire from the roof to the panel box through conduit. Plug-in solar uses the outlet — the output cable just lies along the floor or wall and plugs in.
Special outlet or outlet upgrade
not neededA standard grounded 120V NEMA 5-15 outlet (the most common outlet in US homes) is all you need. No 240V outlet, no dedicated circuit.
What a complete kit looks like
When you buy a kit from a reputable brand like EcoFlow, Anker, or Renogy, you're getting everything in the "you need these" section above in one box, pre-matched, pre-tested, and certified together. The only thing you provide is the wall outlet and the mounting location.
In the box
- Panel(s)
- Microinverter (often attached)
- Output cable + plug
- Mounting brackets
- MC4 connectors
- Manual
You provide
- A south-facing location with sun
- A standard grounded 120V outlet within cable reach
- Basic tools (screwdriver, wrench)
- 30–90 minutes of your time
One thing you can't skip: certifications
A certified kit isn't optional. Uncertified inverters have caused fires, tripped breakers, and fed malformed power into home wiring. Every legal US state requires UL 1741. Don't buy a cheap uncertified import to save $50.