Smart LCD setting (Working modes, Charge Current, Charge Voltage, etc). Built-in MPPT solar charge controller MAX PV Array Open Circuit Voltage: 450V Can provide the power to the load without battery Combining solar system, AC utility, and battery power source to supply continuous power Overload, short circuit and Deep discharge protection Cold start function Support USB, RS485 monitoring function Parallel operation with up to 3 units WIFI remote monitoring (optional) PV1800 PRO is a multi-function inverter/charger, combining functions of inverter, MPPT solar charger and battery charger to offer uninterruptible power support in portable size. PV1800 PRO Series can run without battery. The Maximum PV array open circuit voltage can reach 450V and MPPT voltage is 150~430Vdc, which Can help customers make full use of solar energy.