Off Grid Solar Generator Sizing Guide

Last Updated on October 16, 2023

Off-grid solar systems have gained popularity as a sustainable and cost-effective way to generate power for homes, businesses, and other remote locations. However, these systems often require an off grid solar generator for times when the solar panels cannot produce enough electricity to meet the demand.

Choosing the right off grid solar generator for your system is crucial to ensure that your power needs are met and that you do not experience power outages during periods of low sunlight.

In this article, we will provide a comprehensive off grid solar generator and solar sizing guide for off-grid systems. We will discuss the key considerations when selecting a generator, including its size, fuel type, and efficiency.

We will also cover the critical factors to consider when sizing your solar panels and battery bank, including your energy usage, location, and climate.

By the end of this guide, you will have the knowledge and tools necessary to make informed decisions about your off-grid solar system, ensuring that you have a reliable and sustainable source of power no matter where you are.

Key Takeaways

  • A backup off grid solar generator is necessary for off-grid solar systems, and gas and diesel generators are commonly used for backup charging and power.
  • The off grid solar generator should be around 2x the size of the inverter’s continuous output, and have a warranty for off-grid use as well as 2-wire start capability for automatic generator start function.
  • Solar panel considerations include cost calculators, tax credits and incentives, solar lease options, community solar, and sun hours maps to determine solar energy potential.
  • Other important factors include understanding solar electrical requirements and permitting, net metering, sizing and selecting a battery bank, and deciding between DIY or contractor installation and grid-tied vs. off-grid systems.

Off Grid Solar Generator Sizing Considerations

When considering off grid solar generator sizing, it is important to keep in mind that the generator should be around 2x the size of the inverter’s continuous output. This ensures that the off grid solar generator can meet the demands of the system during periods of low solar production or high energy consumption.

Additionally, it is important to choose a off grid solar generator that has a warranty for off-grid use and possesses 2-wire start capability for automatic generator start function. This allows the off grid solar generator to start automatically when the battery voltage drops below a certain level, ensuring seamless power supply to the system.

Efficiency comparison and fuel type selection are also important considerations when choosing a off grid solar generator for a home solar system. Diesel generators are more fuel-efficient and longer-lasting compared to gas generators, making them a popular choice for off-grid systems. However, Kohler 12kW and 14kW generators can use natural gas or propane, providing an alternative fuel source for those who prefer it.

Moreover, 3600 RPM generators are more cost-effective while 1800 RPM generators are more efficient and last longer. It is important to weigh the pros and cons of each option before making a decision on the most suitable off grid solar generator for your off-grid solar system.

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Off Grid Solar Panel Considerations

The cost of solar panels can be assessed using a Solar Panel Cost Calculator. This tool takes into account the size of the system, the type of panels, and the location of the installation. By entering these factors, the calculator can estimate the cost of the system.

Additionally, the cost of solar panels can potentially be offset through Federal Solar Tax Credit and State Solar Incentives. The Federal Solar Tax Credit allows for a credit of up to 26% of the cost of the solar system, while State Solar Incentives vary by state. These incentives can include rebates, tax credits, and grants.

Another option for those interested in solar power is community solar. This allows individuals to share solar power and receive credit on their energy bills for the power produced. Community solar can be particularly useful for those who cannot install solar panels on their own property or do not want to invest in a full system. By participating in a community solar program, individuals can still reap the benefits of solar power while sharing the costs and benefits with others in the community.

Off Grid Solar Generator Sizing – Wrap Up

Off-grid solar systems have become increasingly popular, and choosing the right off grid solar generator for backup power is crucial. When considering generator size, it’s important to factor in the maximum power load you’ll need and the generator’s fuel efficiency. It’s also important to consider the altitude and temperature of your location, as these factors can affect the generator’s performance. In addition, you should consider noise levels and emissions regulations, as some generators are louder and emit more pollutants than others.

When it comes to sizing your solar panels, it’s important to consider your energy needs and the amount of sunlight your location receives. You’ll also need to factor in the efficiency of your solar panels, which can vary depending on the manufacturer and type of panel. To ensure that you have enough power for your needs, you’ll also need to size your battery bank appropriately, which will depend on your energy usage and the amount of time you’ll need to rely on battery power.

Choosing the right off grid solar generator and sizing your solar panels and battery bank are essential to ensuring that your off-grid solar system provides enough power to meet your needs. Other important considerations include net metering regulations and whether to hire a professional solar installer or to do it yourself. By carefully considering all of these factors, you can make informed decisions about your off-grid solar system and enjoy the benefits of sustainable, self-sufficient living.

Off Grid Solar Generator Sizing – Frequently Asked Questions

How much maintenance is required for a backup off grid solar generator?

Off grid solar generator maintenance varies depending on usage and type of generator. Regular maintenance includes oil changes, air filter cleaning, and battery maintenance. Solar panel cleaning should also be done regularly to maintain optimal performance.

Can an off grid solar generator be used as the primary source of power for an off-grid system?

Off grid solar generator limitations make it impractical to use as the primary power source for an off-grid system. Alternative power sources, such as solar panels, are more cost-effective, require less maintenance, and have a lower environmental impact.

Are there any restrictions or regulations on installing solar panels in certain areas?

Solar panel installation is subject to local zoning laws and building codes. Permitting requirements vary by state, and some states require licensed professionals to install solar panels. Legal requirements for off-grid solar systems also vary.

How long can a battery bank typically last before needing to be replaced?

The longevity of a battery bank depends on several factors, including the type of battery, usage patterns, and maintenance. Replacement cost varies depending on the size and type of battery used, ranging from a few hundred to several thousand dollars.

What are some common mistakes to avoid when designing and installing an off-grid solar system?

Common mistakes to avoid when designing and installing an off-grid solar system include underestimating energy needs, improper battery sizing, inadequate wiring, lack of system monitoring, and inadequate backup power sources. Proper planning and professional installation can prevent these errors.


  • Karen Markovic

    Karen Markovic is a skilled professional in solar energy, holding a Bachelor's degree in Environmental Engineering from Cornell University. With expertise in solar panel design and system optimization, Karen specializes in customized solar solutions for residential and off-grid systems, promoting sustainability and efficiency.

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