How to Choose the Right Solar Generator Size for Your Needs (2024)

solar generator sizing - what solar generator is best for you

Are you trying to figure out which solar generator is right for your home, RV, off-grid location, or even a backup option?  

You’re not the only one. Picking the right solar generator size is crucial for the best results.

Imagine always having enough power for your needs, especially during those unexpected outages, and knowing you are not wasting excess power. 

Stick with me, and I’ll guide you through the basics of solar generator sizing, including optimal solar solutions for off-grid setups.

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Why Proper Solar Generator Sizing Matters

solar generator size

When you’re looking to purchase a solar generator, one of the first questions is, “What size do I need?” It’s more than just having power on demand. It’s about optimizing performance, prolonging your equipment’s life, and being smart with your investment.

Efficiency and optimization

Getting your solar generator sizing right is like finding the perfect shoe fit. A perfectly sized generator aligns with your energy demands, neither wasting power nor falling short.

Longevity of the solar generator

Choosing a generator that constantly runs at full capacity can speed up wear and tear.

On the other hand, an overly large generator can face its own set of challenges, like incomplete battery charging cycles. 

But when you nail the size, you strike a balance in the workload, promoting a longer, more reliable operational life for the generator. Learn more about effective upkeep for your solar generator to ensure its longevity and efficiency.


It might seem attractive to opt for the largest solar generator out there. However, that isn’t always the wisest financial decision. Over-sizing leads to unused capacity, and while a smaller unit might be cheaper initially, it can incur future costs. 

By focusing on accurate solar generator sizing, you make a sound investment, tailored to deliver the right power for your needs without unnecessary expenses.

Related Articles

Best Off-Grid Solar Generators

Getting Started With Solar Generators

How Do Solar Generators Work?

Can a Solar Generator Power Your Entire Home?

Yes, a solar generator can power your entire home. However, the capability to meet the energy demands of your home depends on both the size of the solar generator and your household’s consumption patterns.

Note: While there are expensive solar generators available, I wouldn’t recommend relying on them for continuous heavy-duty tasks such as running your whole home.

Solar generators are great for temporarily powering both small and demanding devices. But for long-term, whole-house energy needs? A solar system kit is a more fitting choice. In my opinion, pairing a solar generator with a solar system kit is a strategic move, they both can help you navigate and potentially lessen your home’s energy draw.

Components of a Solar Generator

A solar generator comprises photovoltaic solar panels that capture sunlight and convert it into electricity. This generated power is transformed by an inverter from direct current (DC) to alternating current (AC) for household use. 

Meanwhile, the solar battery stores surplus electricity, and additional system components maintain a smooth operation.

Factors Impacting Solar Energy Collection

  • Power Rating: The solar panels’ inherent power generation capability.
  • Panel Efficiency: How well the panels convert sunlight to energy.
  • Number of Panels: The total count of panels affects overall energy collection.
  • Sunlight Exposure: Areas with longer peak sunlight hours naturally collect more energy.
  • Cloudy Day Performance: While efficiency decreases, panels can still gather energy during overcast conditions.

Choosing the Right Solar Generator

From compact modular systems perfect for smaller dwellings or RVs to expansive setups ideal for larger residences, there’s a range of solar generators available in the market. 

Bluetti Solar Generators are renowned for their versatility, offering both compact options for on-the-go power and larger units designed for whole-house backup. For homeowners with higher energy demands, these generators can seamlessly integrate with grid-tied power, providing continuous power even during cloudy days or periods of heavy appliance usage.

For those leaning towards modular systems suitable for smaller setups, EcoFlow and Jackery have made a mark in the industry. EcoFlow’s kits, for example, come equipped with a power hub, distribution panels, and stackable batteries—perfect for tiny off-grid homes or RVs. 

On the other hand, Jackery’s portable power stations cater to the needs of outdoor enthusiasts and those requiring a backup during outages, bridging the gap when sunlight or primary power sources are insufficient.

Your choice should be rooted in your household’s size and energy consumption.

How Much Power Does Your Home Need?

When considering a solar generator for your home, understanding your power needs is crucial. 

For those contemplating a solar generator for their home, it’s imperative to accurately gauge your energy needs. 

While the average American household uses between 25-30 kWh daily, this can differ based on individual habits and lifestyles. 

To avoid overspending on a solar generator, avoid making rough estimations. Truly understanding your power requirements is vital.

Finding Your Average Electricity Consumption

Ever wonder how much electricity your home really uses? It’s not just about looking at a bill, it’s about understanding the bigger picture. Let me walk you through it

  1. Your Location Matters: You know those sweltering summers or chilly winters? Depending on where you live, they might be pushing your electricity bill up or down. So, don’t be surprised if your buddy living in a milder climate has a different consumption pattern.
  2. Think About Blackouts: If you’ve ever experienced a power outage, you’ll know it changes the game. If your main reason for going solar is to have that backup during blackouts, you might use less electricity than you think during those times.
  3. Zoom In On The Essentials: Sometimes, it’s not about the big picture but about those crucial appliances you can’t live without. Focusing on their electricity needs, especially during emergencies, can give you a clearer idea of what you’re looking for.

Trust me, understanding your household’s unique electricity consumption is worth the effort. And in my opinion, it’s the first step toward making a smart choice about solar generators.

Finding Your Essential Wattage Requirements

an image of Finding Your Essential Wattage Requirements - watts=amps x volts

Watts = Amps x Volts

Determining your household’s specific wattage requirements is the foundation of choosing the right solar generator. 

But don’t fret—it’s simpler than it sounds. Let’s walk you through a 5 step process and I will give an example calculation below.

  1. Identify Appliance Wattage Requirements: Begin by jotting down the wattage of each essential appliance. This information can typically be found on the appliance’s label.
  2. From Volts/Amps to Watts: Occasionally, you’ll find power requirements listed as volts or amps. In that case, use this easy formula: Volts (V) x Amps (A) = Watts (W).
  3. Count Your Running Watts: Total up the running watts of every essential appliance. This cumulative figure gives you an idea of the generator’s minimum requirement.
  4. Account for Starting Watt Requirements: Some appliances demand more power when starting up. Identify the appliance with the highest starting wattage and add it to your total.
  5. Do the Math: The sum of your starting and running watts determines the capacity of the solar generator you need.

A Practical Example: 

Consider the wattage requirements for these commonly used household items:

  • Refrigerator/Freezer: 700 W (Running) / 2200 W(Starting)
  • Light Bulb: 75W
  • Microwave: 1000W
  • TV: 500W

Totaling the running watts: 700 + 75 + 1000 + 500 = 2275 Watts

Considering the appliance with the highest starting wattage (Refrigerator/Freezer): 2200 watts

Total starting watts = 2275 + (2200-700) = 3775 Watts

For these four common household items, you would ideally need a solar generator that can handle at least 3775 starting watts.

Number of People in Your Household

Solo Users – 1 Person

The number of individuals residing in your home directly influences the capacity of the solar generator you’ll require. Living solo or with just one other person? A smaller solar generator might be adequate. Such generators typically offer moderate battery storage and solar charging capacities, making them a fit for lower consumption needs.

What would suffice? 

Jackery Explorer 1000 Plus Portable Solar Generator

BLUETTI AC180/P Solar Portable Power Station

2-4 People

For households with two or three people, a mid-tier solar generator with increased battery storage and higher solar charging capacities is more appropriate. These systems are designed to handle the typical energy demands of a moderately sized household without constant reliance on the grid.

What would work?

BLUETTI Solar Generator AC200P with 3 PV200 Solar Panels Included

EF ECOFLOW Solar Generator DELTA Max

4+ People

However, if you’re part of a bustling family of four or more, you’ll want to invest in a more robust solar generator. These high-capacity systems come with substantial battery storage, greater solar charging potential, and the ability to manage larger energy requirements, ensuring that your home remains powered for extended durations.

What would work?

BLUETTI Solar Generator AC300&B300 Modular Power System

Jackery Solar Generator 3000 Pro

4 Tips on Electricity Consumption During a Blackout

When the grid goes down, it’s essential to think strategically about electricity usage. Managing power consumption during a blackout can mean the difference between having power for a few hours versus a couple of days. 

Here are some strategies to make the most of your solar generator’s capacity.

  1. Unplug Non-Essential Devices: Devices left plugged in, even if they aren’t turned on, can still consume a phantom load. Unplug gadgets and electronics that aren’t critical.
  2. Make Use of Natural Lighting: Open curtains and blinds during the day to take advantage of natural sunlight. This minimizes the need for artificial lighting and conserves energy.
  3. Utilize Manual Tools: Instead of electric can openers or electric kettles, use manual versions. It might be slightly less convenient, but it saves precious energy.
  4. Opt for Cold Meals: Preparing cold meals like salads or sandwiches can eliminate the need for cooking appliances. Store a few ready-to-eat meal options in the pantry for emergencies.

Being proactive in your approach can greatly extend the duration your solar generator can support your home during blackouts.

The Difference Between Starting and Running Power for Appliances

Explanation of terms

  • Starting Power: The initial surge of power required to start an appliance.
  • Running Power: The consistent power an appliance needs once it’s operating.

How does it affect solar generator sizing?

Appliances with high starting power require a generator with a larger starting watt rating. To prevent overloading, ensure your generator’s starting watt rating accommodates the highest surge from your appliances.

Common Appliance Energy: Start-Up vs. Regular Watts

Special considerations for high-consumption appliances

Certain appliances, like HVAC systems, have significant starting watt requirements. Always account for the highest starting wattage and add that to your cumulative running wattage.

If your home frequently powers high-energy appliances, consider a more robust battery backup system. Brands like EcoFlow and Bluetti offer great additions to your solar toolkit.

Solar Panel Integration with Generators

When you think about a solar generator, it’s more than just the battery storage; it’s also about how efficiently solar panels can recharge that generator. Let’s touch upon the relationship between solar panel size and your generator.

The link between panel size and generator size

Your solar panels and generator should be in harmony. If your panels produce more energy than your generator can store, you’re not using them to their full potential. Conversely, if your generator can store more energy than your panels can produce, it might not recharge as quickly as you’d like. 

Aim for a balance. For example, a 1000Wh generator would ideally be paired with solar panels that can produce around 100W to 200W for efficient charging during peak sunlight.

Optimizing solar panel-array configurations

Beyond size, the configuration of your solar panels matters. For optimal energy production:

  • Orientation: Ensure panels face the direction receiving the most sunlight (typically south in the Northern Hemisphere).
  • Tilt/Angle: Adjust the tilt based on your latitude and the season for maximum sunlight capture.
  • Avoid Shading: Even a small shadow can reduce a panel’s efficiency drastically. Regularly check for obstructions and clean the panels.

Tailoring Solar Generator Size to Different Scenarios

Choosing the right solar generator depends largely on the specific scenarios you’re anticipating. Here’s a tailored guide to help you match your needs to the right generator size.

Off Grid Living

Embracing an off-grid lifestyle brings its own set of power challenges. Solar generators are invaluable in such settings, providing a consistent and renewable energy source.

When picking a solar generator for off-grid life, it’s not just about daily electricity needs but also accounting for seasonal sunlight fluctuations. A larger system with ample storage can offer power even during days with minimal sunlight such as the BLUETTI AC300 + B300 – Home Battery Backup

Bluetti AC300 Home Battery Backup Kit for Off-Grid Use

Note: Please be aware that actual wattage requirements may differ from those in the table, as they depend on the particular models and types of appliances you own.

Portable needs (camping, RVs, and outdoor activities)

For those who love the outdoors, be it camping, traveling in an RV, or other activities, a solar generator that’s compact and efficient is key. Portability and speed of charging become paramount. 

If you’re aiming for a powerful punch on your camping adventures, consider a setup like the Jackery Solar Generator 1000. It packs a 1002Wh battery that peaks at 2000W, handy for juicing up everything from your phone to power-hungry coolers and CPAP machines.

Jackery Explorer Solar Generator 1000 Pro Wattage Table

Note: Please be aware that actual wattage requirements may differ from those in the table, as they depend on the particular models and types of appliances you own.

Power outage backups

Unforeseen power outages can disrupt daily life. Having a solar generator ready for backup can make a significant difference. When selecting for this scenario, think about which appliances are crucial during an outage and the typical duration of blackouts in your locale. A medium-range generator with notable storage can keep critical devices operational, so you’re not left without the necessary amenities.

EcoFlow DELTA Pro 3600W Portable Power Station

Note: Please be aware that actual wattage requirements may differ from those in the table, as they depend on the particular models and types of appliances you own.

Professional outdoor setups

For those who operate outdoors professionally – be it event organizers, photographers, or field-based researchers – a reliable power source like a solar generator is beneficial. Given the variety of equipment, they may rely on, a generator with diverse outlets and sufficient output is key. It’s also wise, in my opinion, to prioritize generators known for durability, given the range of environments they might encounter.

Jackery Explorer 3000 Pro Solar Generator for Outdoor Setups

Note: Please be aware that actual wattage requirements may differ from those in the table, as they depend on the particular models and types of appliances you own.

3 Practical Tips for Perfect Solar Generator Sizing

In the world of solar generators, there’s no one-size-fits-all. But with a few smart strategies, you can find the right fit for your unique needs.

Tip 1. Tools and Calculators Available

Nowadays, many online tools and calculators are available that help you determine the ideal solar generator size. By simply inputting your daily energy consumption and the devices you want to power, these tools provide you with a rough estimate to guide your purchase.

Tip 2. Get Expert Consultation and Assessments

While online tools offer preliminary insight, nothing beats a direct consultation with an expert. Solar professionals can analyze your specific requirements and recommend a generator tailored to your situation. In my opinion, this personal touch can significantly influence your decision, ensuring you get maximum value for your investment.

Tip 3. Monitor Your Electricity Bills

One simple yet effective strategy is to monitor your monthly electricity bills. This can give you a clear picture of your consumption patterns, allowing you to choose a solar generator that aligns with your actual usage.

When you dive into renewable energy, like solar generators or wind turbines, it’s super important to know your energy needs. After all, you want to save energy but also make sure you have enough for your day-to-day tasks. It’s all about finding that sweet spot between saving and having enough.


Understanding and selecting the appropriate size for your solar generator is crucial to maximizing its efficiency. It’s not just about having power, but about having the right amount of power tailored to your needs. 

As the world shifts towards sustainable solutions, it’s a noble endeavor to prioritize green energy sources in your daily life. While solar generators are fantastic, if you find yourself consistently using high-energy appliances, consider enhancing your setup. A more robust backup system might be in order.

FAQs About Solar Generator Sizing

Can Using a Solar Generator Save You Money?

Yes, in the long run, using a solar generator can lead to cost savings. While there’s an initial investment, the sun’s energy is free. Over time, as you draw less power from the grid, you’ll notice a decrease in your monthly electric bills. Furthermore, with increasing energy prices, having a solar generator can act as a hedge against rising costs.

How Long Do Solar Generators Last?

Solar generators consist mainly of a battery, charge controller, and solar panels. With regular maintenance, the solar panels can last 25-30 years or more. The battery’s lifespan varies, but typically they last between 5-15 years, depending on the type and usage. It’s essential to size the generator correctly to avoid unnecessary wear on the battery due to frequent deep discharges.

Can I Upgrade My Solar Generator in the Future?

Most solar generators allow for scalability. If your energy needs increase, you can usually add more solar panels or additional batteries to the system. However, ensure the generator’s inverter can handle the increased power load.

Does Weather Affect Solar Generator Sizing?

Yes, weather conditions can impact the amount of sunlight your solar panels receive. If you live in an area with frequent cloudy or rainy days, you might need larger panels or more of them to capture enough energy. It’s a good idea to size your generator based on the least sunny times of the year to ensure consistent energy.

What Happens if My Energy Needs Change?

If your energy consumption increases or decreases significantly, you might need to reassess the size of your solar generator. A system that’s too small might not meet your energy needs, while an oversized system could lead to inefficiencies. Periodically reviewing your energy consumption can help ensure your solar generator remains effective.

Do Solar Generators Require Maintenance?

While solar generators have fewer moving parts than traditional generators and require less routine maintenance, it’s essential to periodically check the system. Cleaning the solar panels, ensuring connections are secure, and monitoring the battery’s health are all parts of maintaining optimal performance. Proper maintenance can also influence the size you initially choose, as well-maintained systems tend to have longer lifespans and consistent performance.

Can I Use a Solar Generator in Conjunction with My Grid Power?

Absolutely! Many people use solar generators as a supplementary power source alongside their regular grid power. This can help reduce electricity bills and provide backup during power outages. When sizing a solar generator for such use, consider how much of your daily or emergency energy needs you’d like the solar generator to cover. This will give you an idea of the appropriate size to complement your grid power.

How many solar panels do I need to go off-grid?

1. Calculating Your Energy Needs:

  • The average off-grid home typically requires about 7 kW (or 7,000 Watts) of power. This is your target for total solar power production.

2. Understanding Solar Panel Output:

  • Solar panels vary in size and power output. Commonly, a 200-watt panel measures around 64 x 26 inches, while a 350-watt panel is larger.
  • Panel performance, measured under standard conditions, is crucial. The bigger the panel, generally, the more power it produces.

3. Number of Panels Needed:

  • If you’re aiming for 7 kW and using 200-watt panels, you’d need about 35 panels. With 350-watt panels, you’d need around 20 panels.

4. Roof Space Considerations:

  • In the U.S. the average home’s roof is about 1,700 square feet.
  • 35 panels will occupy roughly 389 square feet. This leaves plenty of room for additional panels if needed in the future.

5. Tailoring to Your Needs:

  • Every home is different. Your daily electricity usage, roof space, and the amount of direct sunlight your home receives all affect how many panels you need.

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