RYOBI names its 18V ONE+ automotive inverter the “1000-Watt” model. Clip it to a single 18V ONE+ battery and RYOBI’s own manual caps it at 300 watts — the full 1000 watts only shows up if you bypass the battery and clamp the unit directly to a car battery. It’s not a defect or a marketing trick exactly, but it is a number in a product name that most buyers never actually get from the battery they own.
RYOBI also sells a completely different line — 18V and 40V “Power Station” units — that scales output by adding more batteries and runs genuine pure sine wave output. This guide separates the two product families, and covers which one actually fits what you’re trying to power.
Key Takeaways
- The RYi1030A (“1000-Watt” ONE+ automotive inverter) delivers 300W max from an 18V ONE+ battery, 120W max from its 12V DC adapter plug, and the full 1000W only when clamped directly to a car battery. The RYi8030A (“800-Watt”) follows the same pattern: 300W from the 18V battery, up to 650W from a direct battery terminal connection.
- RYOBI’s ONE+ automotive inverter line publishes modified sine wave output and explicitly warns against sensitive electronics, compressor-based devices, and life-support or medical equipment.
- The 18V ONE+ 1800-Watt Power Station (RYi818BG) and the 40V 1800-Watt Power Station (RYi1802B6) are a separate, genuinely pure sine wave product line that scales with battery count — RYOBI cites roughly 450W per battery, up to 1,800W running with four batteries.
- The 40V 300-Watt POWERSOURCE (RYi300BG) is pure sine but current-limited to about 2.5A, which several buyers report is only enough for phones and very small electronics despite the 300W name.
Two Completely Different Product Lines
RYOBI’s inverter lineup splits into two families that share a brand but nothing else about how they work.
Automotive inverters (RYi120A, RYi8030A, RYi1030A) are small units meant to plug into a 12V outlet, wire directly to a car battery, or clip onto a single 18V ONE+ battery for portable use. They’re built around modified sine wave output, and the wattage in the model name describes the direct-to-car-battery figure, not what the 18V battery alone delivers.
Power Station units (RYi818BG at 18V, RYi300BG and RYi1802B6 at 40V) are a different category entirely: multi-battery power banks with pure sine wave output, USB-C and USB-A charging, and app-based monitoring on the larger models. These are built to scale — add batteries, get more sustained watts — rather than to plug into a vehicle’s electrical system.
The “1000-Watt” Number Only Applies to One Connection Method
This is the detail that catches people out. RYOBI’s own published specifications for the RYi1030A list three different output ceilings depending on how you power it: 120W max through the 12V DC adapter plug, 300W max when running off an 18V ONE+ battery, and up to 1000W when the unit is clamped directly to a car battery via its terminal clamps (RYOBI operator’s manual, retrieved 2026-07-30). The RYi8030A follows the identical pattern at a smaller scale: 300W from the 18V battery, and up to roughly 650W for 30 minutes (600W continuous) from a direct battery terminal connection.
If you’re buying one of these to run off the ONE+ battery you already own — not wired into a vehicle — plan around 300 watts, not the number on the box. That’s still useful for a laptop, small TV, or shop light, but it’s a very different ceiling than the name suggests.
Modified Sine Wave: Read the Warning Before You Plug In Sensitive Gear
RYOBI’s automotive inverter manuals state the output is non-sinusoidal (modified sine wave) and specifically warn against using it with sensitive electronics or devices containing a compressor, directing users to check their device’s own manual for compatibility. This isn’t unique to RYOBI — it’s the same trade-off covered in our DeWalt power inverter guide, where every DeWalt unit in that line documents the same modified sine wave output.
The manuals for these automotive units also warn not to power life-support devices or other necessary medical equipment, and not to operate them in an enclosed space alongside automotive lead-acid batteries. Both are worth reading in full before you assume “it’s just an inverter” and plug in whatever’s nearby.
The Power Station Line Is Pure Sine and Scales With Batteries
The 18V ONE+ 1800-Watt Power Station (RYi818BG) is a different product category: RYOBI advertises pure sine wave technology “safe for sensitive electronics,” up to 3,000 starting watts and 1,800 running watts, three 120V 15A outlets, and support for up to eight batteries with output cited at roughly 450W per battery, scaling to 1,800W with four batteries installed. It also supports hot-swapping batteries without losing power and app-based monitoring through RYOBI’s GenControl app.
| Model | Platform | Waveform | Rated output |
|---|---|---|---|
| RYi1030A | 18V ONE+ / 12V automotive | Modified sine | 300W (battery) / 1000W (car battery clamp) |
| RYi300BG | 40V | Pure sine | 300W, ~2.5A limited |
| RYi818BG | 18V ONE+ (up to 8 batteries) | Pure sine | 1,800W running / 3,000W starting |
| RYi1802B6 | 40V (up to 4 batteries) | Pure sine | 1800W max running |
The 40V 300-Watt POWERSOURCE (RYi300BG) is worth a specific caution: it’s pure sine and fits any 40V battery, but it’s current-limited to roughly 2.5A on its household outlet. Buyer reviews consistently note that despite the “300W” name, it’s realistically sized for phones, small routers, and similarly light loads rather than anything drawing meaningfully steady current.
Sizing: Match the Load to the Right RYOBI Line
| Load | Rough draw | Which RYOBI unit |
|---|---|---|
| Phone, small USB devices | Under 50W | RYi300BG (40V POWERSOURCE) |
| Laptop, shop light, small TV | 50–300W | RYi1030A off an 18V battery, or RYi818BG on one battery |
| Corded tool, small appliance | 400–1000W | RYi1030A clamped to a car battery, or RYi818BG with 2–4 batteries |
| Sensitive electronics, CPAP, compressor-based device | Any | RYi818BG or RYi1802B6 (pure sine) — never the modified sine automotive line |
Frequently Asked Questions
Why does my RYOBI “1000-watt” inverter only put out a few hundred watts?
The 1000W figure applies only when the RYi1030A is clamped directly to a car battery. Running it from a single 18V ONE+ battery caps output at 300W by RYOBI’s own published specification.
Are RYOBI automotive power inverters pure sine wave?
No. RYOBI’s ONE+ and 12V automotive inverters (RYi120A, RYi8030A, RYi1030A) publish modified sine wave output and warn against sensitive electronics, compressor-based devices, and medical equipment. The Power Station line (RYi818BG, RYi300BG, RYi1802B6) is pure sine.
Can I run a CPAP machine on a RYOBI inverter?
Only on the pure sine Power Station units, and even then, RYOBI’s manuals warn against powering life-support or necessary medical equipment on any of its inverters. Confirm compatibility with your device’s manufacturer before relying on any inverter for medical equipment.
How many batteries does the RYi818BG need for full power?
RYOBI cites roughly 450W per battery, reaching the full 1,800W running rating with four batteries installed. It supports up to eight batteries total and can hot-swap them without losing output.
What’s the difference between the 18V and 40V RYOBI power stations?
Both are pure sine and scale with battery count, but they draw from different battery platforms entirely (18V ONE+ vs 40V) and aren’t interchangeable. Buy into whichever platform you already own tools on.
The Bottom Line
If you already own 18V ONE+ batteries and just need occasional light AC power, the RYi1030A or RYi8030A will work — just plan around 300 watts from the battery, not the number in the product name. If you need real sustained power or anything remotely sensitive, skip the automotive line entirely and buy into the pure sine Power Station family, sized to how many batteries you’re willing to run at once.
For a look at how a competing brand handles the same modified-versus-pure-sine tradeoff, see our DeWalt power inverter guide or our Milwaukee power inverter guide.
