This little box provides on-demand power when off the grid

EcoFlow’s Alternator Charger is a device you install in your pickup truck, van, or RV to charge the giant power station you carry to keep all your gear running.

While your vehicle’s on, the Alternator Charger produces up to 800W. That’s about eight times more power than you can typically extract from a 12V cigarette lighter jack, and it’s enough to charge EcoFlow’s new 1kWh Delta 3 from zero to full in a little over one hour of driving. It takes five hours if you’re traveling with EcoFlow’s larger 4kWh Delta Pro 3.

It’s also clever enough to reverse the flow of electrons, using the power station to maintain your starter battery with a trickle charge or jump-start it back to life. When you return home from the job site or vacation, those big-ass portable batteries can be connected to EcoFlow’s $200 balcony solar kit to help offset your energy bill and provide emergency power during a blackout.

EcoFlow’s Alternator Charger is far from an industry first, and it uses proprietary connectors that only work with Ecoflow’s own batteries. But the company brings simplicity, elegance, and a superior user experience to a product usually designed for electricians and mechanics.

After 3,700 miles (6,000km) of testing, I can say that the $599 Alternator Charger could be a game-changer for many. It allowed my wife and I to live and work carefree from a Sprinter van this summer, comforted by all the modern conveniences afforded by so much on-demand power.