the problem[s] with 1:1 solar charging

this is a draft 1:1 rule of thumb There is a rule of thumb that says a 1:1 ratio is the minimum amount of solar needed to charge a deep cycle bank.  The long form is 1w:1ah, which means 1 watt of solar panel for every amp-hour of lead chemistry deep cycle battery capacity under

Challenging conditions, Portland edition

Portland is in the worst insolation zone in the US, Zone 6 with 3.5 hours of full sun. Based on average high temp of 63.3F this would be Average       136A/day Winter         102A/day (-25%) Spring/Fall  170A (+25%) In winter all of the generated power can fit in the battery