How many solar panels do I need for a shed?

It depends on your shed's purpose. Basic lighting and a phone charger: 1 panel (400W). Home office with a laptop, monitor, and lights: 2-3 panels (800-1,200W). Workshop with power tools: 3-5 panels (1,200-2,000W). The exact number depends on hours of use and your location's peak sun hours.

Can I power a shed with solar without connecting to the grid?

Yes. A small off-grid system with 1-2 panels, an MPPT charge controller, and a LiFePO4 battery works well for sheds with light to moderate loads. This avoids the cost of trenching electrical cable from your house to the shed, which can cost $1,000-$3,000+ depending on distance.

Do I need a permit for solar panels on a shed?

It varies by jurisdiction. Many areas exempt small off-grid systems (typically under 1 kW or under 600W) from permit requirements because they are not connected to the utility grid. Grid-tied systems on any structure almost always require an electrical permit and inspection. Check with your local building department -- rules vary significantly by county and municipality.

Should I mount solar panels on my shed roof or use a ground mount?

If your shed roof faces south (in the Northern Hemisphere) with no shade and has adequate structural capacity, roof mounting is simplest and cheapest. If the roof faces east/west, is shaded, or is structurally weak, a ground mount near the shed gives you optimal orientation and tilt angle. Ground mounts cost more ($200-$500) but can produce 15-25% more energy due to ideal positioning.

How much does a shed solar system cost?

A basic off-grid kit (1 x 400W panel, charge controller, 100Ah LiFePO4 battery, wiring): $700-$1,000. A home office system (2-3 panels, 200Ah battery, inverter): $1,500-$2,500. A workshop system (4-5 panels, 300Ah battery, 3,000W inverter): $3,000-$5,000. Compare this to trenching and wiring from the house, which costs $1,000-$3,000 for the trench alone.

Can I run power tools on shed solar?

Yes, but size carefully. Most power tools have high startup (surge) wattage -- a circular saw rated at 1,400W can surge to 2,800W. You need an inverter rated for the surge, and your battery bank must handle the current draw. An off-grid system with a 3,000W pure sine inverter and 300Ah LiFePO4 battery handles most tools, but not heavy continuous loads like a welder or large air compressor.

Is it cheaper to run power from the house or install shed solar?

For sheds within 50 feet of the house, running a buried electrical cable is usually cheaper ($1,000-$2,000 installed) and gives unlimited power. For sheds 100+ feet away, trenching costs $2,000-$5,000+, making a solar system competitive. For light-use sheds (lighting only), a small solar kit ($500-$700) is almost always cheaper than any electrical run.

How Many Solar Panels For A Shed? (Workshop, Office, Or Storage)

A shed's solar needs vary dramatically by use case. A basic storage shed with LED lighting needs just 1 x 400W panel. A home office with a laptop and monitor needs 2-3 panels. A workshop running power tools needs 3-5 panels. The right answer depends on what you are doing in the shed -- and whether you go grid-tied or off-grid.

Shed solar is one of the few cases where off-grid often makes more sense than grid-tied. Trenching an electrical cable from your house to a detached shed costs $1,000-$3,000+ depending on distance, and that is before you pay for the electricity. A standalone solar system can be cheaper, avoids the trenching hassle, and gives you power where the grid does not reach.

Quick Answer: Panels By Shed Use Case

Shed type	Daily energy use	400W panels needed	System size
Storage (lighting only)	0.3-0.5 kWh	1	400W
Hobby shed (lights + radio + charger)	0.5-1.0 kWh	1	400W
Home office (laptop, monitor, lights, fan)	1.5-2.5 kWh	2-3	800-1,200W
Workshop (power tools, compressor, lights)	3-5 kWh	3-5	1,200-2,000W
Heated workshop (space heater)	8-15 kWh	Not practical with solar alone	---

These assume 5 peak sun hours and the PVWatts derate of 0.83.

Important note on heating: Electric space heaters draw 1,500W continuously. Running one for 8 hours uses 12 kWh -- more than a 2,000W solar system produces in a day. For heated sheds, use a propane heater, wood stove, or insulation with a small infrared panel heater on a timer.

Try The Calculator

Solar panel wattage

Type any value 10–750 W. Common sizes: 100 W (portable), 400 W (residential 2026), 580 W (commercial).

Peak sun hours per day

hrs

Don't know your PSH? Find your exact value →
Benchmarks: U.S. avg 4.98 · Phoenix 6.54 (highest) · Seattle 3.95 · Anchorage 3.17 (lowest). Above ~5.5 = sunny · 4.5–5.5 = average · below 4.5 = cloudy.

Daily kWh production

0.00kWh

Based on a 400W panel and 5.32 peak sun hours per day

Daily

1.60kWh

average across the year

Monthly

48kWh

× 30 days

Yearly

583kWh

× 365 days

Monthly production for a 400W panel — US Average

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

kWh per month · Source: NREL PVWatts v8

216 kg

CO₂ avoided per year

0.05

equivalent US homes powered

trees planted equivalent

$93

estimated annual savings

Tap to see sensitivity analysisSensitivity analysis

Sensitivity range
Scenario	Value
Low (-20%)	1.3 kWh
Expected	1.6 kWh
High (+20%)	1.9 kWh

Your daily production scales linearly with both panel wattage and peak sun hours. A 10% change in either input changes your result by 10%.

See production for your state Try the system size calculator

Detailed Energy Use By Scenario

Scenario 1: Basic Lighting and Storage

Load	Watts	Hours/day	Daily Wh
LED light fixtures (2-3)	30	3	90
Phone/tool charger	15	1	15
Motion sensor light (exterior)	10	2	20
Total			125 Wh

One 400W panel produces about 1,660 Wh/day at 5 PSH (400 x 5 x 0.83). This is more than 10x the load, giving you huge margin for cloudy days. A single 100W panel would actually suffice here, but 400W panels cost only slightly more and give you room to add loads later.

System cost: $500-$800 (1 panel, small charge controller, 50-100Ah battery)

Scenario 2: Home Office

Load	Watts	Hours/day	Daily Wh
Laptop	60	8	480
External monitor (27")	40	8	320
LED lighting	30	8	240
Router/WiFi extender	15	10	150
Phone charger	15	2	30
Desk fan (summer)	30	4	120
Small space heater (winter, used sparingly)	750	2	1,500
Total (summer)			1,340 Wh
Total (winter with heater)			2,840 Wh

Summer use needs 2 panels. Winter with an electric heater needs 4-5 panels -- consider a small propane heater instead and stay at 2 panels year-round.

System cost: $1,500-$2,500 (2-3 panels, MPPT controller, 200Ah LiFePO4, 1,000W inverter)

Scenario 3: Workshop With Power Tools

Load	Watts	Hours/day	Daily Wh
LED shop lights (4-6 tubes)	120	6	720
Circular saw	1,400	0.5	700
Drill press or miter saw	1,200	0.3	360
Dust collector	750	0.5	375
Battery tool chargers	100	2	200
Radio/speaker	20	6	120
Air compressor (small)	1,500	0.3	450
Total			2,925 Wh

Power tools have high wattage but low duty cycle -- you run a circular saw for minutes, not hours. The real challenge is surge current: a 1,400W saw may spike to 2,800W on startup. Your inverter must handle these surges.

System cost: $3,000-$5,000 (4-5 panels, 40A MPPT, 300Ah LiFePO4, 3,000W inverter)

Grid-Tied vs Off-Grid For Sheds

Factor	Off-grid	Grid-tied (from house)
Upfront cost	$500-$5,000 (system)	$1,000-$3,000 (trenching) + $0/system
Monthly cost	$0	Added to house electric bill
Available power	Limited by battery + panels	Unlimited (from grid)
Best for	Sheds 50+ ft from house, light-moderate use	Heavy continuous use, close to house
Complexity	DIY-friendly, no permits (usually)	Electrician + permit needed
Maintenance	Battery replacement every 10-15 years	Minimal

The break-even distance is roughly 50-75 feet. Closer than that, running a cable from the house is usually cheaper. Beyond that, the trenching cost tips the math toward solar -- especially for sheds with moderate loads.

There is also a hybrid approach: run a basic electrical feed from the house for heavy loads (outlet for a welder, for example) and use a small solar system for daily lighting and charging. This gives you the best of both worlds at moderate cost.

Mounting Options

Shed roof mounting: Simplest and cheapest. Use standard roof brackets or rail mounts. Ensure the shed roof can handle the weight -- a 400W panel weighs about 50 lbs. Most stick-built sheds are fine, but plastic or thin metal sheds may need reinforcement. Ideal if the roof faces south with minimal shade.

Ground mount near the shed: Best for sheds with poor roof orientation (east/west facing), shaded roofs, or weak structures. A simple ground mount made from galvanized Unistrut or aluminum rail costs $200-$500 in materials. Advantages include easy access for cleaning, adjustable tilt angle, and no roof penetrations.

Pole mount: A single pole mount holds 1-2 panels and takes minimal ground space. Good for tight lots where neither roof nor ground mount works. Can be elevated above garden beds or walkways.

Permit Requirements

Solar permit rules for sheds vary significantly by location:

Small off-grid systems (under 600W-1kW): Many jurisdictions exempt these from electrical permits because they are not connected to the utility grid and operate at low voltage (12V or 24V DC). This is the sweet spot for shed solar -- you avoid permitting hassle entirely.

Larger off-grid systems: Some jurisdictions require an electrical permit for any permanent wiring installation, regardless of grid connection. The threshold varies. Check with your local building department.

Grid-tied systems on accessory structures: Almost always require a full electrical permit, plan review, and inspection -- the same as a residential solar installation. The permit process adds $200-$500 and 2-6 weeks.

HOA considerations: Some HOAs restrict solar panels on accessory structures even when local laws allow them. Solar access laws in many states override HOA restrictions for primary structures, but coverage of sheds and outbuildings is less clear.

System Design Tips

Oversize the battery, not the panels. For off-grid sheds, a battery that can handle 2-3 days of autonomy without sun is more valuable than extra panels. Cloudy streaks happen, and running out of power in a workshop mid-project is frustrating.

Use a low-voltage disconnect. This automatically shuts off loads when the battery drops to a set threshold (usually 20% state of charge), preventing deep discharge damage. Most MPPT controllers include this feature.

Wire for expansion. Even if you start with 1 panel, run wire sized for 3-4 panels. Upgrading from 10 AWG to 6 AWG later means rewiring the entire system. A few extra dollars in wire now saves hours of work later.