Just started using SAM with download of 2014.1.14 version to model my new PV solar install. The calculations of electricity without solar seemed low when using PG&E tiered rates, so I stripped down all the values and found strange calculation results. If I put just a single kwh (unit=1) into the first tier, nearly all the pricing is using the tier 1 rates. If I put 0.5 kwh into the first tier, then nearly everything goes into the 2nd tier pricing. Pretty much the allocation between Tier 1 and Tier 2 is exponential with values from 0 to 2.