OP, For the best Forum advice provide the following information.
#1 - What type of camping do you do? 100% shore power connected, occasional boondocking, etc.
#2 - What is the make a model of your converter?
#3 - Do you have a generator?
#4 - What's the longest period of time, when & if you dry camp?
#5 - Is the 70 watt panel a portable & do you have a controller?
#6 - Do you have a battery disconnect switch installed?
#7 - Is the coach stored at home or off site?
#8 - Do you have a trickle charger?
#9 - Do you have, at minimum, a hand held voltmeter?