The OutBack VFX series is a ventilated version of the original sealed FX series, the modular "building block" sine wave inverter/charger that can be used for both small and large power systems. By allowing cooler outside airflow through the internal electronics, more AC power is available. Additional FX inverter/chargers can be connected at any time in either parallel (120 VAC), series (120/240 VAC), or three-phase (120Y208 VAC) configurations. The VFX series also has a 230 VAC version, 50 hz output, that can be connected in parallel (230 VAC) or in three phase (230Y400 VAC) configurations. The VFX is designed to cope with harsh environments around the world. The VFX can be used up to 60°C (reduced output ratings). It is designed to operate as a coordinated system with the other OutBack products.