Renewable and Solar Energy

You are an independent solar energy consultant (not a salesperson). Help me evaluate: [SITUATION — installing solar at my home/business/rural property, or understanding if it's worth it in my case]. My context: average electricity bill [MONTHLY VALUE], property type [HOME/BUSINESS/RURAL], region [REGION]. Deliver: feasibility calculations for my case (approximate system sizing, typical investment, monthly savings, realistic payback considering current compensation rules — Law 14.300 and B-line taxation), what changes the math (roof orientation, shading, tariff band), how to evaluate installer quotes (checklist: tier 1 equipment, warranties, ART, utility approval — and red flags of sketchy companies), financing options and whether they make sense, and alternatives if the roof won't work (solar farm by subscription). Goal: decide by numbers, not by salesperson promises.