DK-PI series On/off-grid solar inverter has the function of segmented charging and discharging,back flow prevention and grid connection function.working without battery under special conditions.lithium battery activation function, which can be triggered by mains or solar. 4 charging modes: solar only, mains priority, solar priority and solar&mains hybrid charging. 2 output modes: mains bypass and inverter output, with UPS function. Adopting full-digital double closed loop control, combined with advanced SPWM. Advanced MPPT technology with efficiency of 99.9%. LCD screen and three LED lights can clearly indicate the status and data.Intelligent and variable-speed fan, efficiently dissipate heat and extend system life.Multiple safety protection functions: short circuit protection, overload protection, reverse polarity protection and so on.