MIDNITE SOLAR PRINT FAQ's
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FAQ #: 231
Classic Charge Controller
Q: Classic MNGP (display screen) says "OCP" -Why?

A: First, OCP stands for OVER CURRENT PROTECTION, check your wire size - DONT GUESS! This can be normal if the battery bank is small or the inverter cables are too small. If this shows up just once in a great while that would be OK, but if it is happening regularly you may want to look at the size of the battery cables, age of the battery bank, or the size of the battery in amp-hours. Call Tech Support for assistance.