Can a 2000-watt generator run a circular saw?

Sometimes, but it depends on the saw’s startup surge and how hard the tool is working. A smaller generator may run a circular saw under light conditions, but thicker cuts or added loads can push it past its limit.

Can a portable generator run a table saw?

Yes, but table saws usually need more headroom than smaller tools. Startup surge, heavier cutting, and running multiple loads at once can quickly expose an undersized generator.

Do power tools need startup watts?

Yes. Many power tools with motors need extra wattage when they first start. That startup surge is often why a generator that looks adequate on paper still struggles in real use.

Can I run power tools and a refrigerator at the same time?

Sometimes, but you need to add both the running watts and startup surge together. This is exactly why a load calculator matters before buying or connecting a generator.

Is an inverter generator enough for DIY tools?

For lighter DIY use, battery chargers, and some smaller tools, yes. For heavier saws, air compressors, or multiple simultaneous loads, a larger conventional or higher-output generator is often the better fit.

Why is my generator running but not powering my house?

This usually means your generator is not connected to your electrical panel. Running extension cords only powers individual appliances, not your home circuits. A proper setup requires an inlet box and interlock or transfer switch.

Do I need to turn off the main breaker when using a generator?

Yes. The main breaker must be turned off before turning on your generator breaker. This prevents backfeeding electricity into the grid, which is dangerous and illegal in most areas.

Solar Generator Sizing Calculator

Use our Solar Generator Sizing Calculator above to estimate the battery capacity needed to power your appliances during a power outage. Choosing the correct solar generator size is one of the most important factors in building a reliable backup power system.

Solar generators are typically rated in watt-hours (Wh) or kilowatt-hours (kWh). The larger the battery capacity, the longer your appliances can run. Many homeowners focus on wattage alone, but runtime is equally important when sizing a backup power solution.

How the Calculator Works

The calculator estimates the battery capacity required based on your power consumption and desired runtime.

Battery Capacity (Wh) = Running Watts × Runtime Hours

To account for inverter losses, battery reserve, and real-world operating conditions, it’s wise to add an additional 20–25% safety margin.

Appliance	Watts	Hours	Required Battery
Refrigerator	700	8	5,600 Wh
CPAP Machine	60	8	480 Wh
Router & Modem	50	24	1,200 Wh

Common Solar Generator Sizes

500–1,500 Wh

Phones
Laptops
Routers
Small electronics

2,000–3,000 Wh

Refrigerators
CPAP machines
Internet equipment
Lighting

4,000–6,000 Wh

Multiple appliances
Freezers
Sump pumps
Extended outage coverage

10,000+ Wh

Whole-home backup
Large battery systems
Multi-day outages

What Appliances Can a Solar Generator Run?

Appliance	Typical Watts
Refrigerator	100–800
Freezer	200–700
Television	100–300
CPAP Machine	30–90
Microwave	1,000–1,500
Coffee Maker	800–1,200
Sump Pump	800–1,500
Well Pump	1,000–2,500

Solar Generator vs Battery Capacity

Many people confuse watts, watt-hours, and kilowatt-hours.

A 2,000-watt inverter can power a 2,000-watt appliance, but a 2,000 Wh battery can only run that appliance for about one hour before the battery is depleted.

Understanding the difference between power output and stored energy is essential when choosing the right solar generator.

Example Calculations

Refrigerator During an Outage

700W × 8 Hours = 5,600 Wh

Refrigerator + Freezer

1,200W × 8 Hours = 9,600 Wh

CPAP Machine Overnight

60W × 8 Hours = 480 Wh

Frequently Asked Questions

What size solar generator do I need for a refrigerator?

Most refrigerators require between 1,500 and 6,000 Wh of battery capacity depending on runtime requirements and compressor cycling.

What size solar generator do I need for a sump pump?

Many sump pumps require 800–1,500 running watts and may have significantly higher startup surge requirements.

Can a solar generator power a house?

Large solar generators and battery systems can power portions of a home or even an entire house depending on energy consumption and battery capacity.

How many solar panels do I need to recharge a solar generator?

The answer depends on battery size, panel wattage, sunlight conditions, and charging goals.

Is a solar generator worth it for emergencies?

For many homeowners, solar generators provide quiet, low-maintenance backup power without the need to store gasoline or propane.