wow, really 7.5watts of solar? Crazy! I mean that in a not-so-positive way, as that little bit of 'solar' is not going to do anything for your battery(s)... you have more parasitic draws than that can overcome. Maybe a 100w panel would do it.
'14 Palazzo 33.3 bunkhouse 34' diesel
KingTailgater2 Dish HD, 100w/5a SOLAR, BlueOx
100,000+mi since '14 - US, Alaska, Canada - Hiawassee, GA! (also, '14 Gulfstream Amerilite and '07 ForestRiver Rockwood) : )