High Frequency Off Grid Solar Inverter PV1800 VPK Series (1-5KW) 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: 1. Pure sine wave output 2. Smart LCD setting(Working modes, Charge Current, Charge Voltage, etc.) 3. Built-in PWM 50A/60A solar charge controller 4. New SUB working mode(Solar-Utility-Battery working mode) for 4K-5K series 5. Combining solar system, AC utility, and battery power source to supply continuous power 6. Overload, short circuit and deep discharge protection 7. Parallel operation with up to 3 units (Available for 4KW/5KW only) 8. Cold start function 9. Support USB, RS485 monitoring function with free CD 10. WIFI remote monitoring (optional) 11. Compatible to generator Pure Sine Wave Output: The electrical waveform output of PV1800VPK is a pure sine wave, which has the same quality as utility and/or domestic power. This type of waveform is suitable for most all electrical devices, appliances and tools. This pure sine wave unit provides more capabilities than modified sine wave inverters, because it is a cleaner form of power. The pure sine wave also effectively reduces the noise produced while using appliances. Wifi communication: you can download this app on your cellphone and monitor the whole system, you will know how much electricity the system generate and sell to utility. Ability for parallel operation: The inverter is able to run in parallel operation mode to increase the capacity and reliability of the solar system. For higher reliability, parallel kits are adopted for invertersto communicate with each other. Up to 3 inverters can be installed together. Either single-phase or three phases parallel operation is available.