When sizing a PV system you do a load calculation - which determines how much power you use on an average day so you can build a system that meets those needs.The first thing you learn is that anytime you use electricity to produce heat (hot water, electric heat, clothes dryer) you use tons of power so these are usually the first things to be eliminated. To be honest, if you have wood heat it's easy to dry clothes inside and an on-demand hot water system is much more efficient than keeping water hot all day for your evening shower. AS for our workshop, it's not huge but we do have all the necessary tools, but all 110v ones. This isn't a huge commercial shop with big machines running all day long.
We also build off- grid tiny houses. These have the same basic design except because of the space constraints it cannot have a huge battery bank. For the most part we keep the systems simple and try to run as many things direct from 12v as possible, including lighting, refrigeration, and water pump. In addition we put in a small inverter that will create 110v power for small appliances, computers etc. For hot water we stick with on-demand propane, with a special unit designed for small spaces.
Alot of people ask about putting the solar panels on the roof, but our preference is to do a mobile ground mounted rack that is easy to move, easy to clear of snow and simple to orient towards solar south. For our current build we have a 825 watt array, 11k watt battery bank wired in 12v. This is designed to meet the clients needs and hold 4-5 days of power. There is also a charging input plug that would allow for hooking up to a power cord should one be available or a small portable generator and the batteries could be topped up this way if it's necessary.