PV1800 VPK is a multi-function inverter/charger, combining functions of inverter, PWM solar charger and battery charger to offer uninterruptible power support with portable size. Its comprehensive LCD display offers user-configurable easy-accessible button operation such as battery charging current, AC/solar charger priority, and acceptable input voltage based on different applications. Features: Pure sine wave output Smart LCD setting(Working modes, Charge Current, Charge Voltage, etc.) Built-in PWM 50A/60A solar charge controller New SUB working mode(Solar-Utility-Battery working mode) for 4K-5K series Combining solar system, AC utility, and battery power source to supply continuous power Overload, short circuit and deep discharge protection Parallel operation with up to 3 units (Available for 4KW/5KW only) Cold start function Support USB, RS485 monitoring function with free CD WIFI remote monitoring (optional) Compatible to generator