The RD Series 24VDC inverter/charger is designed specifically for off-grid use. It is built in the same chassis as the MS sine wave inverters. The power factor corrected battery charger efficiently charges your batteries even atlow AC voltage from low-cost generators, while the modified sine wave inverter keeps the cost down. Additionally, the battery temperature sensor works with the charger for optimum battery charging. The RD Series comes in three power models. The RD inverters are ETL Listed to UL1741 for solar and off-grid applications. 2-year warranty. Dimensions: 16.6" x 8.4" x 4.7"