300W/500W Four-Bay Battery Inverter – Portable Sine Wave, Multi-Brand
Charged up and need a 110V/220V outlet out in the field where there is no wall socket? This four-channel battery inverter turns your 18–20V power tool batteries into AC power you can run small tools, chargers, lights and gear from. Sine wave output keeps sensitive electronics happy.
- Four battery slots - swap packs to keep going, used in sequence
- Multi-brand compatible: Makita, DeWalt, Milwaukee, Bosch, Worx and more
- Sine wave output, smoother and safer for electronics
- Built-in power indicator on the battery side
- Portable design made for job sites, garages and camps
- Two voltage variants: 110V (US-style) and 220-240V (EU/UK-style)

Choose your power and plug
Pick the model that matches your tools and your country: 300W (peak 600W) for lighter loads, or 500W (peak 1000W) if you are running something a bit hungrier. Output in 110V or 220-240V depending on your region.
| Output | AC 110V or 220-240V (by model) |
| Continuous power | 300W (peak 600W) or 500W (peak 1000W) |
| Input | 18-20V / up to 23V power tool batteries |
| Slots | Four battery bays, used in sequence high-to-low voltage |
| Waveform | Sine wave (electronics-safe) |
| Compatible battery brands | Makita, DeWalt, Milwaukee, Bosch, Worx, Craftsman and similar multi-voltage packs |
| Indicator | Built-in battery power indicator |
| Warranty | 12 months |

Four bays, longer run
The four slots are designed to be used in sequence (high voltage first). When one pack drains, swap in the next - so instead of running one battery flat then stopping, you keep going through the string of packs you already own.

Frequently Asked Questions
Which voltage should I pick?
110V for US/Japan, 220-240V for EU/UK/AU. Choose the one that matches your country's outlets and your tools.
What can it run?
Depending on the 300W or 500W model - small power tools, a battery charger, work lights, phone/laptop chargers and similar loads within the continuous rating.
Does it work with my batteries?
It is built for common 18-20V power tool batteries (up to about 23V) from Makita, DeWalt, Milwaukee, Bosch and similar systems.
Why sine wave?
Sine wave output is gentler on sensitive electronics than modified square-wave inverters, so it is safer for chargers and tools with electronics.
Warranty and Support
Backed by a 12-month warranty and a 30-day money-back return policy. If anything is off, our support team sorts it out - no hassle.














