In the 4kW solar kit, the solar panels capture the sun's energy and send it to the inverter, which converts it into 230V AC power for immediate use in the home or facility. Excess energy is stored in high-efficiency batteries for use during periods without sunlight. You can also use it for off-grid power in an RV, cabin, outdoor shed, boat and other off-grid situations. Off-grid Solar System – LF – 220V outputs Power: 3kw, 6kw, 12kw, can be parallel Model: JV OF3KWL-P, JV OF6KW-P, JV OF12KWL-P Features: 1. Dual Charging: Our system can be charged by solar panels and utility power. Rated power 4kw to 10KW, with DSP control 3.