"维修费用低" can be translated into English as "low maintenance costs" or "low repair expenses".
"Low maintenance costs" is a more commonly used and concise expression, emphasizing that the cost associated with keeping something in good working condition is not high.
"Low repair expenses" specifically refers to the cost of fixing or mending something when it breaks down, which also conveys the idea of affordability in repairs.
Both expressions are accurate and can be used depending on the context.