How to Choose the Right Backup Generator for Your Home or Business

Unexpected blackouts. Storms that leave you in the dark. Or sudden power cuts that threaten your business. It happens more often than most people think. When the lights go out, life and work grind to a halt—unless you’re prepared.

At O'Connor's Electrical, we know how important reliable power is. Whether you’re a homeowner with a full fridge or a small business owner protecting your bottom line, a backup generator can be the difference between chaos and calm.

Why Backup Generators Matter ⚡

Imagine your home suddenly silent. The hum of the fridge stops. The lights flicker out. Devices die. For businesses, the stakes are even higher—lost sales, spoiled stock, or critical systems offline.

Power outages can be caused by:

• Severe weather (storms, floods, heatwaves)
• Grid failures or rolling blackouts
• Accidents or equipment breakdowns
• Scheduled maintenance

According to the Electrical Safety Foundation International (ESFI), outages are on the rise. And when they hit, they don’t wait for a convenient time. Having a backup generator is like keeping an umbrella by the door—you hope you won’t need it, but you’re glad it’s there when the storm hits.

Types of Backup Generators

Choosing a generator isn’t one-size-fits-all. There are two main types to consider:

Portable Generators

• Moveable and flexible: You can wheel them out when needed.
• Fuel: Usually run on petrol or diesel.
• Manual start: Plug in what you need, but you’ll have to set it up each time.
• Great for: Short outages, powering essentials, or as a temporary solution.

Standby Generators

• Permanently installed: Sits outside, connected to your electrical system.
• Automatic: Kicks in seconds after an outage.
• Fuel: Often runs on natural gas or propane.
• Great for: Long outages, whole-home or business backup, peace of mind.

Think of portable generators as a spare tire—handy for emergencies. Standby generators are like all-weather tires—always ready, always on.

Sizing Your Generator: How Much Power Do You Need?

Too small, and you’ll be left in the dark. Too big, and you’ll waste money. The right size depends on your needs.

Step 1: Make a List

• What must stay on? (Fridge, heating/cooling, lights, medical devices, security systems)
• What’s nice to have but not essential? (TV, computers, Wi-Fi)

Step 2: Check Wattage

Every appliance and system uses a certain number of watts. Add up the starting (surge) and running wattage of everything you want to power.

• Tip: Most appliances list wattage on a label or in the manual.

Step 3: Add a Safety Margin

Add 10–20% extra to your total. This covers unexpected surges and keeps your generator from straining.

Step 4: Consult a Professional

An emergency electrician can help calculate your exact needs. For businesses with complex equipment or high-voltage systems, it’s even more important to get it right.

Installation Considerations: Safety First

Installing a backup generator isn’t a DIY project. Mistakes can be dangerous—think fire hazards, carbon monoxide poisoning, or backfeeding that endangers utility workers.

Key Points to Consider

• Location: Generators must be outside, well-ventilated, and away from windows or vents.
• Transfer Switch: Required for standby units. It safely switches your power source from the grid to the generator.
• Wiring: Must comply with the National Electrical Code (NEC) and manufacturer guidelines.
• Permits and Inspections: Many areas require permits and a safety inspection before you can use your generator.
• Professional Installation: Always use a licensed electrician. They’ll ensure everything is safe, up to code, and ready for emergencies.

Maintenance Tips: Keep Your Generator Ready

A generator is like a car—it needs regular care to stay reliable.

• Test runs: Start your generator monthly. Let it run for 15–20 minutes.
• Fuel checks: Keep fuel fresh. Old petrol or diesel can gum up the engine.
• Oil and filters: Change oil and air filters as recommended by the manufacturer.
• Battery: For standby units, check the battery regularly.
• Professional servicing: Schedule annual inspections. A qualified electrician will spot issues before they become problems.

A neglected generator is just a heavy paperweight. A well-maintained one is a lifeline.

Cost Factors: What to Budget For

Backup generators are an investment. Costs can vary widely, depending on size, type, and installation needs.

What Impacts the Price?

• Generator size and type: Portable units are less expensive, but offer less power.
• Fuel source: Natural gas and propane units may need extra plumbing.
• Transfer switch: Required for safe operation.
• Installation complexity: More circuits or custom features mean higher costs.
• Permits and inspections: These are necessary for legal and safe operation.

Tip: Factor in ongoing maintenance and fuel costs. A cheap generator that fails when you need it most can end up costing more in the long run.

Emergency Electrician: When Time Matters

If your generator fails during a blackout, or you smell gas, hear strange noises, or see smoke—call an emergency electrician immediately. Don’t try to fix it yourself. Safety comes first.

O'Connor's Electrical offers 24/7 emergency service. We’re ready when you need help most.

Frequently Asked Questions

How long can a backup generator run?

Most standby generators can run for days—if they have enough fuel and are properly maintained. Portable units usually need to be refueled every few hours.

Can I power my whole house or business?

Yes, with the right size generator and professional installation. Many people choose to power only essential circuits to save on costs.

Is a generator safe for sensitive electronics?

Modern generators with automatic voltage regulation (AVR) or inverter technology are safe for computers and other electronics. Always check the specs.

Do I need a permit to install a generator?

In most areas, yes. A licensed electrician will handle the permits and ensure everything meets code.

Special Considerations for Your Home or Business

• Medical needs: If you rely on powered medical equipment, a generator is essential.
• Business continuity: Protect inventory, data, and customer trust.
• Remote work: Keep your internet and devices running.
• Home automation: Make sure your smart systems stay online.
• Safety inspections: Schedule regular checks to ensure your system is ready for the unexpected.

A backup generator is more than a convenience—it’s peace of mind. It keeps your family safe, your business running, and your life on track when the grid goes down.

Call O'Connor's Electrical now — or reach us anytime at  844-484-2612 .