Jul 19, 2021 · B-260/B-350 All Electric Van Refrigeration Unit B-260 and B-350 is all electric van refrigeration unit for all electric cargo vans. Usually we have two KINGCLIMA for the voltage solutions. One is to use an external battery with low voltage (DC48V) for refrigeration units, the other is use the electric van high voltage (400V above voltage) for refrigerating.