Table of Contents:
Off-grid solar key points:
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An off-grid solar system is one that is completely independent from the public energy grid, supplying all of the energy used in a home.
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The feasibility of going off-grid depends on your energy usage, system configuration, solar availability, and other factors.
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Grid-tied solar energy setups are typically more affordable and more practical than off-grid systems.
There are a lot of reasons to want to disconnect from public utilities. Whether you want to minimize your carbon footprint, eliminate your energy bill, or simply become more self-sufficient, off-grid solar systems provide a path to independence.
However, going off grid with solar technology has potential pitfalls, and may not be realistic for everyone. We created this guide to show you everything you need to consider before you disconnect from the grid and help you decide if doing so is the right move for you and your home.
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What is an off-grid solar system?
An off-grid solar energy system is a self-sustaining energy solution that operates independently from the public electricity grid. You get power through solar panels and store energy in batteries.
Off-grid systems have the potential to power remote homes, RVs, cabins, and any location aiming for energy independence. With the right off-grid setup, you can eliminate reliance on utility companies, offering autonomy and potential cost savings.
What’s the difference between on-grid and off-grid PV systems?
On-grid photovoltaic (PV) systems are connected to the public electricity grid, allowing for energy exchange, while off-grid systems operate independently, relying solely on solar panels and battery storage.
The key difference between on-grid solar energy systems and off-grid systems is implied by the name. Generally speaking, off-grid setups are simpler and require fewer components. Since they do not require interaction between the solar system and the utility grid, there is no need for the type of advanced controllers that manage that relationship.
Here are a few key differences between on-grid and off-grid solar systems:
| Aspect | On-Grid Systems | Off-Grid Systems |
|---|---|---|
| Grid connection | Connected to public grid | Completely independent |
| Energy storage | Optional | Battery storage essential for using power later |
| Backup power | Provided by the grid | Requires generator or additional storage |
| Ideal scenarios | Urban and suburban homes | Remote areas, cabins, RVs, if you want energy autonomy |
How do solar panels function in off-grid systems?
Solar panels in off-grid systems capture sunlight and convert it into electricity, which is then stored in batteries for use when sunlight is unavailable.
Panels come in a few main types: monocrystalline, polycrystalline, and thin-film.
Monocrystalline panels
Monocrystalline panels feature cells made from a single piece of silicon crystal. These are the most popular type of panels on the residential market. Compared to other options, they have better solar efficiency and a smaller footprint.
Polycrystalline panels
Polycrystalline panels are made by melting several smaller pieces of silicon into a single cell. While they aren’t as efficient as monocrystalline panels, they are also less expensive. They’re popular for commercial or high-scale operations.
Thin-film panels
Thin-film panels are more lightweight and flexible than mono- and polycrystalline panels, making them useful in a wide variety of applications. However, they are notably less efficient and have a shorter lifespan, too.
What role does a solar inverter play?
A solar inverter converts the DC electricity generated by solar panels into AC electricity, which is used by most household appliances. In other words, energy must first pass through the inverter before you can use it for most household applications.
There are two main types of solar inverters that differ in terms of the type of current they produce: Modified sine wave and pure sine wave.
Modified sine wave
Modified sine wave inverters are cost-effective and work for simple systems but may not be compatible with sensitive electronics.
These inverters produce a “rougher” electrical current. While this energy is generally safe to use for most applications, it may not be compatible with some devices and could cause damage in some cases. Inverters that produce modified sine wave energy are usually cheaper than the other option.
Pure sine wave
Pure sine wave inverters produce a smooth and consistent AC output. This means they’re ideal for all types of appliances, including sensitive electronics.
Electricity in the form of a pure sine wave is “cleaner” than the alternative. Inverters that generate pure sine wave electricity are typically more expensive, but it’s usually the better option for your off-grid home setup.
Why use a battery bank for off-grid solar?
Battery banks store excess energy produced during the day for use at night or during periods of low sunlight, providing a continuous power supply in off-grid systems. Off-grid solar energy systems almost always use solar batteries for consistent and reliable energy.
There are three types of batteries typically used in off-grid solar setups:
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Lead-acid (AGM, Gel): These batteries are typically the most affordable type of solar battery. However, they are also heavier, bulkier, and have a shorter working life.
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Lithium-ion: While pricier than lead-acid batteries, lithium-ion batteries charge faster, are more lightweight, and have a longer lifespan.
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Flow batteries: These high-capacity batteries can store substantial amounts of energy, but their cost and size make them impractical for residential use in most cases.
Why are charge controllers important?
Charge controllers regulate the voltage and current from solar panels to batteries, preventing overcharging and prolonging battery life in off-grid systems. There are two main types of solar charge controllers:
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Pulse width modulation (PWM) controllers: These controllers are an older, simpler technology that maintains a consistent voltage and current. They are the less efficient option, but also the more affordable one.
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Maximum power point tracking (MPPT) controllers: A newer, more advanced technology, MPPT controllers adjust voltage and current to the ideal settings for environmental conditions. They are substantially more efficient than PWM controllers but come at a higher price point.
Whichever you choose, it’s important to have a charge controller in your off-grid setup.
Should you also use a generator off-grid?
If your goal is to remain completely off-grid, adding a generator to your setup is generally a good idea. Gasoline or propane generators can fill in when your solar system can’t create enough power to satisfy your energy needs.
They can also serve as an emergency backup in case your system breaks down or during prolonged periods of cloud cover. In many cases, you can use a generator to charge your solar batteries to ensure consistent, reliable energy for your off-grid setup.
How to monitor off-grid solar systems
Monitoring systems track the performance of off-grid solar setups, providing real-time data on energy production, consumption, and storage levels.
These systems can track overall efficiency and alert you to faults within your solar setup. This can help you optimize the energy output of your system and address issues when they come up.
You can monitor your system health with software or apps included with individual components like the charge controller or inverter. Many can integrate with your smart home system. You can also get standalone monitoring systems to tie everything together. Popular options include:
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SolarAssistant
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Victron Energy’s VRM Portal
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Enphase Enlighten app
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Enact Systems
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mySolarEdge app
When does off-grid solar make sense?
Off-grid solar systems can be an ideal solution for many situations. These include:
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Homes and cabins in remote areas
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Tiny homes
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Ecovillages and intentional communities
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Additional dwelling units (ADUs)
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Farm buildings
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Telecom stations
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Disaster relief areas
Off-grid setups are also great for individuals seeking energy independence, sustainability, and resilience against power outages.
That said, using solar energy to stay completely off-grid isn’t realistic for everyone. For example, if you have a large home or have many people living under one roof, the solar system may simply not be able to meet your energy needs. In addition, the weather and light patterns, and other environmental factors may limit how much energy your system can produce.
Pros and cons of off-grid solar
Here are a few pros and cons of off-grid solar:
| Off-Grid Solar Pros | Off-Grid Solar Cons |
|---|---|
| ✅ Complete independence from utility grid | ❌ Limited energy production during winter or on cloudy and rainy days |
| ✅ No energy bills from grid providers | ❌ High startup cost |
| ✅ Provides energy in areas where public grid is unavailable or inaccessible | ❌ No grid support for emergency backup energy |
| ✅ Extremely low carbon footprint | ❌ May not be feasible for some areas |
What companies offer off-grid solar?
Multiple companies specialize in off-grid solar solutions, offering a range of products to meet diverse energy needs.
| Company | Offerings |
|---|---|
| Renogy | Solar panels, batteries, inverters, complete kits |
| SunGoldPower | Off-grid solar kits, inverters, batteries |
| Goal Zero | Portable solar solutions, power stations |
| AIB Off Grid | Custom off-grid systems for homes and cabins |
| Signature Solar | DIY solar kits, batteries, inverters |
| Rich Solar | Off-grid solar panels and accessories |
| Belmont Solar | Custom installations for off-grid applications |
Simplify with solar panel kits for off-grid systems
Off-grid solar kits provide a convenient, all-in-one solution for powering remote cabins, RVs, or homes without utility access. These kits bundle together essential components, making setup easier and more cost-effective for DIY enthusiasts and homeowners.
In other words, you don’t have to pick your own panels and charge controller and inverter. Everything’s included.
Most off-grid solar kits include:
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Solar panels: Capture sunlight to generate electricity.
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Charge controller: Regulates voltage and protects batteries.
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Battery bank: Stores solar energy for use when the sun isn't shining.
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Inverter: Converts stored DC energy into usable AC electricity.
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Cables and mounting hardware: Essential accessories for connecting and installing components.
By eliminating the need to source individual parts and ensuring compatibility, these kits reduce guesswork and accelerate setup time.
Bottom line: off-grid solar requires planning and resources
Going off-grid with your own solar energy setup isn’t just possible these days, it’s getting easier and less expensive. Thanks to advances in solar panel efficiency, battery technology, and energy management systems, off-grid solar systems are getting better and better at meeting energy needs.
With that said, there is still a considerable risk of not having power when you need it with an off-grid system. Before you invest in becoming independent from the utility grid, it is important to carefully consider your energy usage, solar availability in your area, and the type of system you can afford and install on your home.
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Learn more about solar from PowerOutage.us
At PowerOutage.us, we monitor real-time power disruptions for over 150 million U.S. customers using data from 900+ utilities. Trusted by news outlets and emergency agencies since 2016, we create educational content to help homeowners understand technologies like solar energy that improve power resilience and independence.
This article is part of our expert series on solar panel technology, which also includes:
You might also find these in-depth solar guides useful:
Taking your time to research is important, because solar panels aren’t always best for every situation.
FAQ about off-grid solar
Below are a few frequently asked questions about off-grid solar systems:
How much solar do I need to go off-grid?
In order to go completely off-grid with solar energy, you need to generate more than enough energy to meet your needs. This is dependent on how much energy you use on a monthly basis. In order to reliably generate 1,000 kWh of energy each month, you’d need roughly 17 solar panels and three batteries.
Is it worth it to go off-grid with solar?
While it can make financial sense to go off-grid with solar due to energy savings, installing a grid-tied solar system is almost always a more practical option when available. Grid-tied systems require fewer batteries, making them cheaper, and ensure a consistent supply of energy.
What will a 1000 W solar panel run?
You won’t find a single 1000-watt solar panel, but by linking several smaller panels together, you can run a small number of appliances like your TV and refrigerator but you probably can’t power your entire home.
Can a house run 100% on solar?
A house can absolutely run 100% on solar energy, but the cost and capacity of the system needed to do so depend on the size of your home and your energy usage. When grid power is available, it is almost always more cost-effective and reliable to install a grid-tied solar system.
Can I use bifacial solar panels in an off-grid solar system?
Yes, bifacial panels work in off-grid systems and generate extra energy by capturing light from both sides, especially on reflective surfaces like snow or white gravel.
Are PERC solar cells a good choice for off-grid solar systems?
Yes, PERC (passivated emitter and rear cell) cells offer higher efficiency and better low-light performance, making them ideal for off-grid setups needing reliable energy throughout the day.