Review: ROMOSS Thunder RS 300W Power Station

ROMOSS Thunder RS 300W Power Station









  • Features two USB-A Quick Charge ports and a 60W USB-C Power Delivery port, so you're getting three fast charging ports
  • 300W max output and the power station features a single 3-prong AC outlet
  • Small, lightweight and the small screen features the remaining capacity, input / output wattage and estimated runtime and recharge time


  • Battery capacity efficiency isn't too ideal, check out the video review for more info (coming soon!)
(Last Updated On: October 12, 2022)

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Power stations are capable of much at this point and can match up to gas generators; However, the price difference may still be there; using a power station still has many benefits, such as not using gas and being much more user-friendly. One of the best parts about purchasing a power station is the wide range of selections that you now have available in comparison to a few years ago when the market was relatively scarce. Now you can choose a unit best suited for your needs.

In this review, we’re taking a look at this ROMOSS Thunder RS 300W power station. This is one of the most simple power stations we’ve reviewed, but don’t let that fool you; this ROMOSS power station is still capable of a lot and holds its place for specific needs.


Power Capacity:

This is absolutely a mini power station, not just because of its size, but the reason behind the small size is because this unit has a 231Wh capacity. A 231Wh capacity for charging devices is plentiful, but when it comes to powering appliances, that’s where you may find it limiting. Charging phones with this ROMOSS power station can get you about 15 or 20 total charges depending on what phone you are charging; larger devices, such as tablets or laptops with larger batteries, will have about five total charges. So even though this unit is on the low side regarding its capacity, 231Wh is still a lot for charging.

However, 231Wh for powering appliances may be a bit of a letdown, but not exactly. This ROMOSS power station maxes out at a 300W output, so if you’re using the total 300W, you will be looking at a 30-minute runtime for the appliance you’re running. If you’re powering a 230W appliance, you can expect about an hour of runtime, while a 1W appliance will give you 231 hours.

It’s great that this unit allows you to power a 300W appliance, but know that your usage time will be very short. The best way to use this power station for a couple of hours is to go low on the wattage, such as 50W will get you about 4 hours of runtime. Powering a 100W appliance will let you use this unit for about 2 hours, which is incredible considering just how small this power station is.

Output Charging:

Looking at the front, you’ll notice that this ROMOSS power station is definitely on the minimal side when it comes to its ports, but considering its size, capacity, and output, the amount of outputs is just fine.

You get a DC cigarette lighter port, a USB section with two USB-A ports, a single USB-C PD port, and a single AC outlet. Let’s check out what each of them has to offer.

DC Port

The DC cigarette lighter port is the same as most other power stations have, with this one also being a 12V/10A port. Some consumers may find a purpose for the cigarette lighter port, such as powering portable coolers or tire pumps. If you can find a use for this DC port, then great; if not, then no problem; know that it can be a useful port if you can use it.

Charging Ports

The two USB-A ports are Quick Charge ports that can be used to fast charge most Android phones; they can also be used to charge non-Android phones and other USB-chargeable devices. The USB-C port has a 60W Power Delivery output and is the best one because it can charge most USB-C chargeable laptops, and you can use it to fast charge most phones and tablets.

The charging port selection is better than we’d hope for, considering this is such a minimal power station, and you practically have three fast charging ports. In our test, we fast charged a Samsung Galaxy Note 9 and a Galaxy A51 from the two USB-A Quick Charge ports; also, at the same time, we charged a Lenovo Flex 5 from the USB-C PD port.

We’re impressed by the charging ports, and the only thing that could’ve been improved was to make the USB-C port have a 100W Power Delivery output; that would be truly incredible.

AC Outlet

A single 3-prong AC outlet for a 300W / 231Wh power station is acceptable. The unit doesn’t have a very high output or capacity to have it make sense to have more than a single outlet. Would it have been nice to have another AC outlet? Sure, but doing so would have added to the price of this unit. Also, with just a single outlet to use, as long as you’re not using the DC or USB ports, you have the full 300W to entirely focus on the appliance you’re powering from the AC outlet.

We did quite a few tests with this ROMOSS power station, and we’re glad to say that this is a strong power station that is capable of a lot; it definitely can’t power everything, but it can get by just fine if you’re powering needs are within the 300W range.

For our first test, we powered a full-sized Ninja food blender. We set the blender to low, medium, and high; at the blender’s low setting, the power station was outputting 195W, then at medium, the output was 250W, and then at high, the ROMOSS power station had an output of about 304W. So even inching past the 300W max output at the blender’s high setting, this power station was still able to keep going, which is phenomenal when you consider just how small this unit is. Granted, we didn’t have any food blending in the blender, and by actually blending food, the blender may use more power but not much.

The only real concern for running a full-sized blender would be the decreased usage time, so you may want to opt to use a mini blender to increase runtime on this power station.

We then got an electric can opener that could power with no problems with the power station outputting 60W. Then we moved onto a stand mixer, set it to its highest setting, and got a 166W output.

We had a Dremel rotary tool lying around, so we plugged it in, set it to max power, and turned it on; these rotary tools are very powerful and pretty loud, however, for such a small tool, they don’t use much power, and in this case, the power station had an 80W output, and using a mini power station such as this ROMOSS one is perfect for powering this type of mini tool.

Moving onto a 32-inch Samsung TV, the power station had an output of about 60W. Honestly, we would draw the line at 32-inch TV overall when it comes to this ROMOSS power station because larger TVs have higher wattage needs, and we don’t think it’s wise to take the risk of powering those larger ones. So if you’re in the 32-inch range, you’ve got nothing to worry about.

So as you’ve seen, even though this ROMOSS Thunder RS 300 power station has a mini size with a mini capacity and output, it’s still pretty mighty when you know what to power with it. There are still a ton of appliances that you can’t power with this unit, such as most heaters, some mini fridges can’t be powered with this unit, and you can’t power an electric cooktop.

We tested out if a mini fridge would work, and the fridge did try to start, but this power station could not handle the surge power of the fridge, and it automatically shut off. So it has limits, and it’s up to you to use this unit within those limits.

The AC outlet can power appliances up to 600W; however, when you go above the 300W regular output of this power station, the unit regulates power output, decreases voltage, and increases amperage to run appliances. So if you’re running an appliance beyond 300W, it may not run optimally.

Input Charging:

The recharging for this ROMOSS power station is interesting because using a solar panel is the best way to recharge the unit. Most of the time, the fastest way to recharge a power station is to use the AC adapter that came with it. Still, if you have a 100W solar panel and full sun exposure hitting the panels, then you can get up to 80W of solar recharging for this ROMOSS power station that can get it to full power within about 3 hours.

The AC charger that comes in the box has a 45W input which will get the unit back to full power within 5 hours, and the car charger has a 55W recharge rate which will get you a 4-hour recharge time.

So we wish the AC adapter had the same 80W input as the solar recharging so you could use the 80W input at any time in your home, but it’s interesting to see that solar charging would be the better option. In our tests, we used a Fanttik 100W solar panel to recharge this power station and got about 78W, so you don’t have to drop a lot of cash on a high-wattage solar panel, as a 100W panel will do just fine.


Size and Weight:

As we mentioned, this is a small power station with a length of 7.5 inches, a width of 5.5 inches, and a height of 5.8 inches. The unit weighs 6 pounds. You don’t have trouble holding this power station for long, and you can take this with you if you go hiking or camping. Those more powerful and larger power stations within the 1000Wh range are more meant for RV living situations. Still, this ROMOSS power station can just about be taken anywhere except for an airplane. The handle at the top does make portability easier.

Functional Components:

Almost everything you have to use is at the front of the unit, including all the output ports, input ports, buttons, and the screen. The only thing not at the front is the LED flashlight that can be found off the side. The flashlight does have a dedicated power button and only has one constant run mode.

Back to the front of the unit, to turn on the power station, there is a power button, and once you press it, the screen turns on, and the DC and the USB charging section are powered and ready to use; to turn on the AC outlet you have to press the AC power button, and the green light on the button turns on, and it shows on the screen.

The screen for this ROMOSS power station is excellent and one of the best on a power station with this small capacity. The screen shows the remaining battery, wattage input, and output and even indicates the estimated runtime and the estimated full recharge time. Also, on the screen is where you’ll find the active section, such as the DC, USB, or AC section.

The screen is small, and having this much information available is amazing.


Structure and Material:

The entirety of the power station is made of plastic with a few parts of rubber padding. ROMOSS claims this power station can withstand a 1.2-meter drop, which is fantastic because very few power stations have any drop rating. Of course, you should still be careful about dropping it because there’s always a chance that it could get damaged, and you should also keep it away from water.

The AC outlet has a dust cover, which can also do an excellent job of keeping water out.


As we mentioned before, this ROMOSS power station can go beyond its standard 300W output and into 600W, but when going above 300W, the appliances you power may not run at their full capacity. When you go above the 600W range, the unit automatically shuts off, or if you’re above the 300W range for quite some time.


This ROMOSS Thunder RS 300 power station is on the mini side with nearly all of its specs, and that’s completely fine. All the charging ports feature fast charging; you get a DC cigarette lighter port and a 3-prong AC outlet. The 300W output is decent enough to power plenty of appliances still, and the 231Wh capacity is plentiful for charging devices and powering certain low-wattage appliances for many hours.

You won’t be disappointed if you can work within this unit’s short limitations.



The 300W output can still power many appliances if you keep within that 300W range. The usage of a single AC outlet is limiting if you want to power multiple appliances simultaneously, but it’s also what keeps the cost of this unit low. The charging ports are surprisingly robust, with two USB-A Quick Charge ports and a 60W USB-C Power Delivery port. The 231Wh capacity is alright for charging and powering devices; depending on what you’re using with the power station; you can run it for countless hours or just a few minutes.


This is a tiny power station weighing just 6 pounds; you won’t have much trouble being portable with it. This power station is simple, with nearly all usable parts at the front. The is detailed by showing the remaining capacity, wattage input/output, the power stations’ runtime, and the remaining time until a full recharge when recharging the unit.


This ROMOSS power station can withstand a 1.2-meter drop. The AC outlet has a dust cover that can also prevent some light water exposure. The unit turns off after some time when going over its standard 300W output.


The 300W output and a single AC outlet are limiting. Still, if your powering needs fit within the 300W range and you don’t mind just being able to use a single outlet, then this ROMOSS power station is an excellent choice for a mini and lightweight power source.

ROMOSS Thunder RS 300W Power Station Specs
Power Capacity231Wh (10.4Ah/22.2V) /62400mAh (3.7V)
Cell ChemistryLithium-ion Battery
AC Output300W
USB-A Quick Charge Output x25V/3.4A | 9V/2A |12V/1.5A(18W Max)
USB-C Power Delivery Port x15V/9V/12V/15V/20V|3A(60W Max)
Cigarette Lighter Port12V/10A(120W Max)
AC Recharging12-28V(48W Max)
Solar Recharging12-28V(80W Max)
Car Recharging12V(55W Max)
Size7.56 x 5.83 x 5.59 inches
Weight6 Pounds


The ROMOSS Thunder RS 300W portable power station is not a powerhouse, but it’s a great companion whether you use it at home, camping, hiking, or on a road trip. The charging ports, build, output, screen, and AC outlet that lets you use 300W all come together to give a great portable power experience. It also helps that you won’t be spending a fortune.

ROMOSS Portable Power Station 300W, 231Wh Lithium Battery, Solar Power, 120V/600W Pure Sine Wave AC Outlet, PD60W USB C, Portable Power Supply for Home, Camping, Outdoor or Backup Generator
  • ROMOSS 300W Portable Power Station is perfect for camping. 39.6% Smaller, 30% lighter than other LiFePO4 batteries. Its compact size makes it easy to take on the go, while providing 300W of power to keep all of your devices charged
  • Charge up to 5 devices simultaneously - easily power your smartphone, laptop, tablet, and more with this portable 120 volt power bank supply through the AC outlet, PD USB-C, car charge, USB ports
  • 600W Peak Portable Power Supply - 231Wh lithium-ion battery pack with built-in 300W inverter that delivers stable and safe 300W-600W power output. The Smart LED Display with SOS gives you detailed status information
  • Fast Charging for your Drones, Macbook Air, Cameras, Car Refrigerator, phones, iPad, etc. Recharge the backup battery by AC wall adapter, car charger or 12-28V solar panel (NOT INCLUDED). Recharge via MPPT controller by solar takes only 3.3Hours
  • Protection; Our 300W small solar generator portable power station comes with a powerful BMS Battery Management System designed with multiple layers of protection against over-heat, over-charge, over-current, over-discharge, and short-circuits
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