Generators, Solar & Power Backup: Complete Guide

When the power goes out, you want a backup plan that works. Whether it’s a portable generator to keep the refrigerator and lights running, a whole-house standby unit that starts automatically, or a solar-plus-battery system that saves money year-round and keeps you powered during outages, this guide covers every option. We’ll walk through sizing, fuel types, installation considerations, and how to match your backup power solution to your home, budget, and outage tolerance.

Table of Contents

Portable Generators

A portable generator is the most affordable way to keep essential appliances running during an outage. They run on gasoline (most common), propane, or dual-fuel, and range from 1,000 to 15,000+ watts. A 3,500-5,000 watt generator powers a refrigerator, sump pump, lights, phone chargers, and a window AC unit. A 7,500-10,000 watt unit adds a well pump, furnace blower, or microwave.

Portable generators must be run outdoors — the carbon monoxide risk is real and fatal. Place the generator at least 20 feet from any door, window, or vent, with the exhaust pointed away from the house. Use heavy-duty 12-gauge or 10-gauge extension cords rated for the load, or install a manual transfer switch to power circuits directly from your electrical panel.

Inverter Generators

Inverter generators are a technological step above conventional portables. They produce clean sine-wave power safe for sensitive electronics (laptops, phones, medical devices) and are dramatically quieter — often 50-60 dB versus 70-80 dB for a conventional portable. They also throttle the engine to match the load, sipping fuel rather than running at full governed RPM constantly.

The trade-off is cost per watt. An inverter generator costs roughly double what a conventional portable of the same wattage costs. For RV use, camping, tailgating, or powering electronics during outages, the quiet operation and clean power are worth the premium. For running power tools on a jobsite where noise and power quality matter less, a conventional portable may be sufficient.

Whole-House Standby Generators

A standby generator is permanently installed outside your home, connected to your natural gas or propane line and your electrical panel via an automatic transfer switch (ATS). When the grid goes down, the generator starts automatically within seconds and powers your entire house or a pre-selected set of circuits. When the grid returns, it shuts off.

Sizing starts at 7-10kW for a small essential-loads panel (lights, fridge, furnace, sump pump) and goes up to 20-26kW for a whole-house solution including central AC. Installation requires a licensed electrician and plumber/gas fitter. Expect to spend $7,000-$15,000+ installed for a 20-26kW unit, including the generator, transfer switch, concrete pad, gas connection, and electrical work. Annual maintenance includes an oil change and a test run.

Solar Panels & Solar Generators

Grid-Tied Solar Systems

A grid-tied solar panel system generates electricity during the day and feeds excess back to the grid (net metering). It reduces your electric bill but does NOT provide backup power during an outage — grid-tied inverters shut down when the grid goes down for utility worker safety. A typical residential system is 6-12kW, costs $12,000-$25,000 before incentives, and pays back in 6-12 years depending on local electricity rates and sun exposure.

Off-Grid & Hybrid Solar Systems

Adding batteries to a solar system enables backup power. A hybrid inverter manages both the grid connection and battery charging/discharging. When the grid fails, the system islands itself and powers your home from solar and batteries. Off-grid systems are designed to operate independently year-round, typically sized larger with generator backup for extended cloudy periods.

Portable Solar Generators

A solar generator is a battery power station with a built-in inverter and charge controller, designed to be recharged by portable solar panels. They are silent, emission-free, and safe for indoor use (unlike gas generators). Sizes range from 300Wh (charges phones and laptops for days) to 5,000Wh+ (runs a refrigerator and medical equipment). They are ideal for camping, RV boondocking, and short-duration home outages, but cannot match the runtime of a gas generator for extended multi-day outages.

Battery Backup & Inverters

Battery backup systems range from small UPS units that keep your WiFi and computer running through brief outages to whole-home battery banks that power everything for hours or days. Lithium iron phosphate (LiFePO4) batteries dominate now — they are lighter, last longer (3,000-5,000+ cycles), and are safer than the lead-acid batteries of the past.

An inverter converts DC battery power to AC for household use. Pure sine wave inverters produce power identical to grid power and are required for sensitive electronics, motors, and appliances. Modified sine wave inverters are cheaper but can cause buzzing in motors, lines on TV screens, and even damage some electronics — avoid them for anything beyond basic resistive loads like lights.

EV Chargers

Home EV charging ranges from Level 1 (120V wall outlet, 3-5 miles of range per hour of charging) to Level 2 (240V, 25-40 miles per hour). For most EV owners, a 240V Level 2 charger installed in the garage is the sweet spot — it fully charges any EV overnight. Hardwired chargers deliver up to 48 amps (11.5kW); plug-in models using a NEMA 14-50 outlet deliver 40 amps (9.6kW). Installation typically costs $500-$1,500 depending on the distance from your panel and whether a service upgrade is needed.

Sizing Your Backup Power System

What You Want to PowerApprox. Running WattsRecommended System
Phone + laptop + lights + fridge800–1,200W2,000W inverter generator or 1,500Wh+ solar generator
Above + sump pump + furnace blower1,500–2,500W3,500–5,000W portable or inverter generator
Above + well pump + window AC3,000–5,000W7,500W+ portable or 5,000W+ inverter generator
Whole house with central AC (no electric heat)8,000–12,000W20–26kW standby generator
Whole house (all electric, including heat)15,000–25,000W26–48kW standby generator or large solar+battery

Note: motors (furnace blower, well pump, AC compressor, sump pump) have a starting surge 2-3x their running wattage. Size your generator for the starting watts, not just running watts. An electrician or generator dealer can perform a load calculation for precise sizing.

Frequently Asked Questions

What is the difference between running watts and starting watts?

Running (rated) watts is the continuous power a generator can supply. Starting (surge) watts is the extra momentary power needed to start motors — compressors in refrigerators, ACs, and well pumps can draw 2-3x their running wattage for a few seconds when starting. Generators list both numbers; make sure the starting watts rating covers the largest motor you need to start.

Can I plug a generator into a wall outlet?

Never. Backfeeding a generator through a wall outlet energizes your home’s wiring and the utility lines outside, which can kill a lineman working to restore power. The only safe ways to connect a generator to your home’s wiring are a manual transfer switch (installed by an electrician) or a generator interlock kit on your main panel. Both are code-compliant and safe.

How long will a solar generator run my refrigerator?

A refrigerator uses about 100-200 watts (running) and 600-1,200 watts (starting). A 2,000Wh solar generator can run a typical fridge for 10-20 hours continuously, or longer with solar panel recharging during the day. Check your fridge’s EnergyGuide label for the actual kWh per year to calculate precisely.

Are solar panels worth it in 2026?

For most homeowners with good sun exposure and high or rising electricity rates, yes. Federal tax credits (30% through 2032), state incentives, and continued panel price declines have pushed payback periods to 6-12 years. If you also want backup power, a solar-plus-battery system provides both bill savings and outage protection — but the battery adds significant cost.

What maintenance does a standby generator need?

Standby generators run a weekly self-test cycle (usually 5-12 minutes). Annual maintenance includes an oil and filter change, air filter replacement, spark plug inspection, and battery test. Most manufacturers recommend this at 200 hours of runtime or annually, whichever comes first. During extended outages running continuously, check the oil every 8-12 hours.

Final Checklist: Choosing Your Backup Power

  1. List every device and appliance you need to power during an outage, with their running and starting wattages
  2. Decide between portable convenience (portable/inverter generators, solar generators) and set-and-forget reliability (standby generator, solar+battery)
  3. Choose your fuel: gasoline (widely available, degrades in storage), propane (clean-burning, unlimited shelf life), natural gas (never runs out, only for standby), or solar (free fuel, silent)
  4. Budget for the transfer switch or interlock kit and professional electrical installation
  5. Plan for safe operation: outdoor placement, CO detectors, extension cords rated for the load
  6. See our Torque & Impact Wrench Guide and Outdoor Power Equipment Guide for related power tools that pair well with generator power

Ready for the next blackout? The right backup power system means the difference between an inconvenience and an emergency. Browse our detailed guides above for the best-rated generators, solar systems, and battery backups for your home and budget.

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