What Is a Solar Generator?


This article serves as a starting point to get in the know regarding “solar generators”. What is a solar generator? Do they actually work? What do I need to know before I buy one? What can I use them for? Read on and find out…

what is a solar generator featured image

What is a solar generator?

At its most basic level, a solar generator combines a large battery with solar panels. They work by capturing sunlight via your solar panels, storing the energy captured by sunlight into a battery, and then converting that energy into AC power for you to use. They typically come with wall outlets, USB outlets, and even DC outlets.

While the term isn’t entirely accurate, as it doesn’t generate power like fossil-fuel-powered generators do, the term has stuck. We prefer to go by the term “portable power station”, but for this article, we’ll use “Solar Generator”.

Do solar generators really work?

In short, they work for anything a traditional generator can be used for without the fumes, smell, or high maintenance. While it’s true that a big limitation in the past has been output, with solar generators lacking when it comes to powering heavy-duty devices, this has been remedied in recent years with EcoFlow’s X-Boost technology. More on that later.

The key thing that sets solar generators apart from their archaic counterparts is that you’ll need to charge them rather than give them petrol. If you’re charging with solar panels, you’ll want ones with an solar panel connector for maximum compatibilities, such as EcoFlow’s range of portable solar panels, and of course, sun. You can read more about what kinds of solar panels you might consider here.

That being said, solar isn’t the only way to charge up. Almost all solar-powered generators can charge via wall outlets too, with some supporting a bunch of charging methods. In this way, solar generators are much more flexible than traditional generators. EcoFlow DELTA Pro for example lets you use wall outlets, car outlets, solar panels, Smart Generators, or even EV charging stations. Storing renewable energy is now easier than ever.

delta pro ev charging

What should I consider before buying a solar generator?

Okay, so let’s assume you’re on board with the idea of solar generators replacing traditional petrol generators, or perhaps as a generator alternative. What factors should you then consider with this new technology?

Capacity: The thousand-watt question

The first and most important factor you’ll want to look at is how big the battery itself is since you won’t be using a tank full of petrol to power your appliances. A larger battery usually means more capacity, which is measured in ‘watt-hours’. The more watt-hours, the longer you can power your devices before needing a recharge. Let’s take two extremes for comparison when it comes to capacity and portability:

EcoFlow River 2

Perhaps the most portable solar generator going, River 2 is the smallest of the River 2 series and comes in at 256 watt-hours. It’s almost like a giant powerbank with AC, DC, and USB outlets to power your devices. It’s great for short trips, camping, or just to throw in your on-the-go bag.

ECOFLOW River 2 Power Station LiFePO 4 Black - EcoFlow RIVER 2 Max Portable Power Station
River 2 solar generator

EcoFlow DELTA Pro

DELTA Pro — on the other hand — is the largest deviation from old-school generators. It comes in at 3600Wh and can be expanded to 25,000Wh with extra batteries & smart generators. It can integrate directly with your home circuits via accessories and can power your home for days on end during an emergency. And you can monitor it all from your phone. That’s a whole lot more functionality than a traditional generator.

DELTA Pro large solar generator in shed
DELTA Pro large solar generator in shed

How many watt-hours do I need?

Here, a bit of maths comes in handy. Add up the watts your devices require and multiply that by how many hours you’ll need to use them. Then, leave yourself a buffer for conversion inefficiencies. Here’s an example:

Let’s say an extended power outage hits, and you need to power a fridge for 4 hours. A large fridge can use up to 200W an hour, especially if turn-on cooling is required. In this case, you need a battery with more than 1000Wh (200×4). A good fit here might be the 2000Wh EcoFlow DELTA Max; with 2000Wh, you’ll be able to keep your fridge running throughout the blackout, with a spare 1000Wh or so left over to account for any inefficiency. With that excess energy, you could use your microwave and charge up your devices.

You can browse several solar generator sizes here, varying from 210Wh–3600Wh.

Output & Outlets: What can you run on a solar generator?

Different solar generators come with different sets of outlets and can run different things. At a minimum, you’ll want AC wall outlets so you can plug in your appliances with ease, as you would at home. However, newer offerings are much more convenient, offering fast-charge USB outlets, DC outlets, and even wireless charging pads. A good middle ground might be the EcoFlow DELTA, a 1200Wh power station that allows you to power up to 13 devices at once.

DELTA solar generator powering multiple devices
DELTA solar generator powering multiple devices

Beyond just outlets, you’ll also want to consider how much the solar generator outputs. Older, cheaper models tend to lack output, meaning you won’t be able to power larger appliances such as microwaves. However, all EcoFlow solar generators have high output capability and come with X-Boost technology allowing for surges in output requirements.  DELTA Pro, for example, can even power appliances that require as much as 4500W. That’s AC units, heaters, and the like all covered.

Battery Chemistry: LFP vs. NCM Batteries

An important factor that you might not know about coming from a fossil fuel generator is battery chemistry. Different solar generators use different kinds of batteries. The two main ones are NCM batteries and LFP batteries. Each has its own advantages.

DELTA Max Interior

Lithium Iron Phosphate (LFP) Batteries: The workhorses

LFP batteries — named after their elements (LiFePO4) — are designed for long-term, regular use. If you’re looking for a solar generator to be used as a home battery, you’ll likely want an LFP battery since you’ll be cycling it multiple times a week. These have a cycle life almost 5 times that of the NCM alternative. The sacrifice LFP batteries have is that they’re heavier, so if you opt for an LFP battery, make sure it’s easy to transport. EcoFlow DELTA Pro would be a good pick here.

Lithium Nickel Manganese Cobalt Oxide (NCM) Batteries: Flexibility first

NCM batteries can be smaller, lighter, and work just fine in temperatures as low as -20°C. They’re the default pick for most portable solar generators as they are easy to carry around, throw in your trunk for camping, or move around the house. EcoFlow’s DELTA series uses lithium (with the exception of the Delta Pro, which uses LFP). The downside of LFP is that lower cycle life of around 800 cycles before degradation to 80% capacity. That won’t be as big a factor if you’re only using yours for trips.

Solar Input: What solar panel do I need?

Solar-powered generators don’t necessarily work with any solar panel. You should check the solar input that your solar generator supports to ensure that you can use the solar panel you have or intend to buy. EcoFlow’s solar generators all have high solar inputs for their size.

plugging in portable solar panels

Just like with fossil-fuel generators, solar generators are used for a ton of applications. Here are three of the most popular applications:

Solar generators for home backup

Blackouts can happen in the UK, and energy prices will increase due to scarcity and inflationary pressures. As a result, people are using solar generators to power their home appliances as a source of renewable, emergency power. Large portable power stations like DELTA Pro are an excellent go-to for full home backup. Smaller solar generators such as DELTA are good for powering the essentials.

We wrote a dedicated article on this here, that’ll take you through how people backup their homes with solar generators.

Solar generators for camping

Another popular use for solar-powered generators is camping. The attraction is that you can take your campsite to the next level with outlets. We take them for granted indoors, being able to just plug in whenever we need them, now we can do it in the wild. Just make sure not to check your slack messages, perhaps boil yourself a brew instead.

Here, you’ll likely want to opt for a power station that puts portability first such as River 2 Pro, since you’ll be carrying it around with you. However, if you’re going all out, DELTA Pro or Max works here too.

River max plus solar generator for camping

We wrote a full article exploring this topic further here.

Solar generators for Caravans & Vanlife

Did you know vanlife is booming? Since the pandemic, people are looking for alternate ways to travel, and some have even taken the move to the road permanently. Solar generators and caravans or vans are an ideal match. They provide power to your setup and paired with portable solar panels attached to your roof, you’ll have renewable energy on the go. Here, your pick depends on your needs. Large caravans might warrant a large power station, with small vans only requiring a kilowatt-hour or two for a few small appliances and devices.

Here’s some more detail on the topic with another piece we put together.

EcoFlow Official - ECOFLOW River 2 Power Station LiFePO 4 Black

Which solar generator is right for you?

With all that in mind, you’ll start formulating an idea of what you need. Calculate how many watt-hours you require, then weigh up your priorities following that. Outlets, solar compatibility, charging methods, and portability are all factors to consider. To make the choice a little easier, we’ve put together two articles for some further reading, one on the more portable River 2 series and the other on the DELTA series.

River Series Comparison

DELTA Series Comparison

Kris Haagensen
Kris Haagensen
Born and raised in the UK, Kris is a 4.0 International Business grad from Sheffield Business School. After working in the tech industry for half a decade in Shenzhen, China, he's now Lead Copywriter at EcoFlow. Kris is a renewable power enthusiast & uses solar generators to run his DJ gear in exotic locations.

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