The faceplate of this unit has the punch out stating it is a c40, so if you have a 35 or 60 this detail may seem annoying. The unit does everything it should, displaying all it says it will. Adds that piece of mind from available information I want to see regarding my system. So much better than just a blinking LED(which is still has). Pretty expensive for what it is though. Did not come with an owners manual so hopefully you will have the one from your 35/40/60 charge controller that talks about it in detail.

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