solar learning center
Homeowner Resources for Solar Projects
Planning a solar installation is a big decision. Here's what to know — from panel efficiency and inverters to mounts, home heating, and more — so you can make informed choices every step of the way.
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01 — panel efficiency
What Affects Solar Panel Efficiency?
Efficiency measures how much sunlight a panel actually turns into usable electricity — and a handful of factors drive that number up or down.
Panel material
18–22% efficient
Monocrystalline
A single-crystal structure lets electrons move freely — the most efficient option available.
15–17% efficient
Polycrystalline
Made from multiple crystals, which limits electron movement compared to mono panels.
10–12% efficient
Thin-film
Lower efficiency, but lightweight and flexible for unconventional installs.
Technology
PERC
Passivated Emitter and Rear Contact technology captures more of the sunlight that hits the panel.
Bifacial
Captures sunlight from both the front and back — especially effective near reflective surfaces like snow or water.
Temperature coefficient
Efficiency drops as panels heat up. A lower temperature coefficient means less energy lost in hot climates.
Design & quality
Higher-quality panels tend to run more efficient — and usually come with longer warranties, too.
02 — why it matters
Measuring Efficiency — and Why It Matters
How to measure it
Efficiency rating
The percentage of incoming sunlight converted to electricity — a panel rated 20% turns a fifth of the sunlight it receives into usable power.
Wattage comparison
Higher-efficiency panels generally produce more wattage, so you need fewer of them for the same output.
Sun Number score
Factors in your home's sunlight, shading, and roof orientation — a higher score means a better candidate for solar.
Why efficiency matters
Limited roof space
More efficient panels mean fewer panels needed to hit your energy target.
Partial shading
Higher efficiency helps compensate for lost sunlight from trees or nearby buildings.
Long-term investment
A higher upfront cost can pay off by needing fewer panels overall.
Bigger savings
Efficient panels lower your energy bills faster, speeding up your payback.
03 — off-grid realities
Off-Gridding With Solar Power
Most solar homes are still tied to the utility grid — which changes what happens during a blackout.
Are you really "off-grid"?
Grid-tied systems lean on the grid at night or during cloudy weather — and shut off during an outage for safety, so your panels stop working even though the sun's still out.
Staying powered in a blackout
Solar-plus-storage systems bank excess daytime energy in a battery, so your home keeps running when the grid goes down — popular in areas with frequent outages.
Is your electricity really "green"?
Solar cuts your fossil fuel use, but most U.S. homes still draw from a mixed grid.
39%
Grid power from fossil fuels
19%
Grid power from nuclear
13%
Grid power from renewables
Lower carbon footprint
Every kWh you generate is one less pulled from fossil-fuel power.
Less demand for fossil power
More solar homes means less demand on coal and gas plants overall.
Real cost savings
Generating your own power lowers your bill — and storage adds independence from utility pricing.
04 — inverters
What Is a Solar Inverter?
Your panels generate DC power — but your home runs on AC. The inverter is what makes that conversion, turning your solar system's output into power you can actually use.
most common
String inverters
One inverter converts the combined output of a full string of panels.
Advantages
Affordable & simple
Drawbacks
One shaded panel drags down the whole string
Higher efficiency
Microinverters
Installed behind each panel, so every one works independently.
Advantages
Maximizes output on shaded roofs
Drawbacks
More expensive
Best of both
Power optimizers
Conditions each panel's output individually, then feeds it to a central string inverter.
Advantages
Better performance without micro pricing
Drawbacks
Costs more than a plain string inverter
Sizing your inverter
Panel wattage
The inverter needs to handle your system's total wattage — a 5 kW array needs at least a 5 kW inverter.
System design
Installers often size slightly above your panel output to handle spikes or future upgrades.
Efficiency lossal
A little extra headroom accounts for shading, aging panels, and dust buildup over time.
05 — mounts
What to Know About Solar Panel Mounts
The right mount depends on where your panels will sit — roof, ground, or pole — and the angle you need to get the most from them.
Most popular
Roof mounts
Rails attach panels directly to the roof — flush for minimal gap, or tilted for better sun exposure on flat roofs.
Advantages
Space-saving & less visible
Drawbacks
Limited by roof space & may need reinforcement
More flexibility
Ground mounts
Fixed, adjustable, or sun-tracking frames installed on open land instead of the roof.
Advantages
Better angle control & output
Drawbacks
Needs more space & costs more to install
Max sun exposure
Pole mounts
Lifts panels above the ground, fixed or tracking both horizontally and vertically.
Advantages
Avoids ground-level shading
Drawbacks
More land needed & pricier to install
Panel size
Standard panels run about 65" x 39" — more panels means larger mounts to support them.
Space & orientation
Ground and pole mounts need real square footage; roof mounts are limited to what's up there.
Tilt angle
Adjustable mounts need to be set to the angle that captures the most sun in your region.
Do you need a permit?
In most cases, yes — for roof, ground, and pole mounts alike, since each involves structural work or local zoning rules. Most installers handle the permitting for you, but it's worth confirming with your local building department.
06 — home-heating
Solar Home Heating: What to Know and What It Costs
Solar heating harnesses the sun to warm your home — either as an addition to your solar system or as a standalone project.
Mechanical
Active systems
Pumps and fans circulate captured heat — solar air heating warms air directly, while solar water heating warms water for radiant floors, baseboards, or forced air.
Pros
Reliable, consistent heating
Cons
Higher equipment & install cost
No moving parts
Passive systems
Building design does the work — thermal mass, direct-gain south-facing windows, or indirect-gain collectors placed between window and living space.
Pros
No operating costs, low upfront cost
Cons
Depends heavily on home design & climate
What it costs
$3K–$8K
Active water heating
$1.5K–$5K
Active air heating
+10–20%
Passive design (new build)
$3K–$15K
Passive retrofit
Benefits
Lower energy bills
Supplements or replaces conventional heating outright.
Environmentally friendly
Renewable energy that cuts your carbon footprint.
Low maintenance
Passive systems especially — no moving parts, less wear and tear.
Higher home value
Buyers are drawn to the long-term savings and sustainability.
Energy independence
Less exposure to utility price swings or outages.
Incentives & rebates
Many governments help offset the installation cost.
07 — air-heaters
Solar Air Heaters for the Home
A simple, energy-efficient way to heat the air in your home using nothing but sunlight.
Energy savings
Cuts reliance on gas or electric heaters, which get expensive fast in cold climates.
Low operating cost
No fuel costs, and very little maintenance once installed.
Energy independence
Less reliance on grid electricity — helpful where rates are high or outages are common.
How they work
1
Collectors
Roof-mounted panels absorb sunlight and convert it into heat.
2
Circulation
A fan or natural convection moves the heated air into your living space.
3
Storage
Optional thermal mass banks heat for nighttime or cloudy days.
4
Backup
A gas or electric heater can kick in when solar output isn't enough.
What it costs
$1.5K–$5K
Active install
$500–$3K
Passive install
$100–$300
Maintenance / year
5–10 yrs
Typical payback
08 — water heaters
What to Know About Solar Water Heaters
A reliable, eco-friendly way to cover your home's hot water needs using the sun.
How they work
1
Collectors
Dark, heat-absorbing panels gather solar energy and transfer it to water.
2
Storage tank
An insulated tank holds the heated water until it's needed.
3
Circulation
A pump (active) or gravity (passive) moves water through the collectors.
4
Backup heat
An electric or gas element keeps hot water flowing on cloudy days.
Active systems
Direct circulation for warmer climates; indirect circulation (with a heat-transfer fluid) for climates where freezing is a concern.
Passive systems
Integral collector-storage tanks for freeze-free climates, or thermosiphon systems that rely on gravity and natural convection.
What it costs
$3K–$7K
Active install
$1.5K–$5K
Passive install
50–80%
Annual savings on water heating
Up to 26%
Federal tax credit
09 — Pool Heaters
Solar Pool Heaters: What You Need to Know
Keep your pool warm without the running cost of gas or electric heaters.
Best for warm climates
Flat-plate collectors
The most common option — dark panels absorb heat and warm pool water pumped through them.
Best for cooler climates
Evacuated tube collectors
Glass tubes capture more heat even when the sun isn't at its peak.
Best for mixed climates
Hybrid systems
Combines both technologies for flexibility across varied weather.
How they work
1
Circulation
The pool pump sends water to the solar collectors.
2
Heat absorption
The dark collector surface traps sunlight and transfers heat to the water.
3
Return to pool
Heated water flows back until the pool hits the target temperature.
4
Temp control
A thermostat or diverter valve manages flow to keep temperature in range.
Passive
No pump needed — water circulates naturally through gravity and convection. Less expensive, but slower to heat.
Active
A pump actively circulates water for faster, more consistent heating — especially useful in cooler climates.
What it costs
$3K–$5K
Flat-plate install
$4K–$7K
Evacuated tube install
$5K–$8K
Hybrid install
3–7 yrs
Typical payback
Home Improvement Resources
Not finished learning about Solar? Start here.
solar
Solar Installer Checklist
solar
How to Sell Excess Solar Energy
solar
Leasing Solar Panels
solar services
Incentives Make Solar Affordable.
Many states and the federal government offer subsidies and tax credits to encourage solar energy adoption. These incentives can significantly reduce the upfront cost of installing solar panels, making it a more affordable option for homeowners. By taking advantage of these programs, you can lower your energy bills while contributing to a cleaner, renewable energy future.
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