Xantrex Technology 400R - Manual (Page 9)

Important Safety Instructions
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10. If battery acid contacts skin or clothing, wash
immediately with soap and water. If acid enters your
eyes, immediately flood them with running cold water for
at least twenty minutes and get medical attention
immediately.
11. Keep a supply of baking soda on hand in the area of the
batteries. Baking soda neutralizes lead-acid battery
electrolyte.