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anyone know if it's 5/16 or 3/8 opening needed for the 12v to battery terminal connections on the mpp 1012 all-in-one unit? Thanks!

I have the MPP 1012 with 2 HQST 100w polycrystaline panels in series on the roof of the van. This is hooked to a 100ah SOK lithium battery. (spec charge voltage of 14.6v) While it shows charging with solar I've noticed the battery voltage bouncing around quite a bit on both the MPP display and...