So whats a good general rule for number of fuel cells and energy collectors recommended on bases?
Enough energy collectors to cover static requirements, enough fuel cells for however much combat time you think you'll need. If you have, for example, a reactor that uses 3 fuel per thousand energy and your weapons drain 200 energy per second, you'll drain 3 fuel every 5 seconds to power the weapons while in combat and so a standard fuel cell with 300 fuel capacity is worth about 500 seconds of combat time at normal game speed. How many fuel cells is enough? Well, that depends on a lot of things - how often is your station in combat? How long do the engagements last? How much power do its weapons draw? How efficient is the reactor? How often does its fuel supply get renewed by freighters? The greater the reactor efficiency, the less often the station is in combat, the shorter the engagements are, the lower its weapon power requirements, the more often its fuel supply is renewed, the lower the adequate number of fuel cells becomes.
Regarding the number of energy collectors required to cover static requirements:
Based on the chart in the A Guide to Energy thread, having energy collection equal to static requirements will fully cover a station's static energy requirements if it's built anywhere not more than about 90% of the system radius away from the system center in most systems. Doubling the amount of energy collection will extend this to about 95% of the system radius, tripling it will boost that to about 97%. If you want to, you can create designs specifically for the point in the system that you're going to build the station at, but I would personally not bother; it's much easier to manage a single design than the dozens that you might require if you try to optimize for where you build the station. Regardless, it's a decent rule of thumb that energy collection greater than or equal to the static energy requirement is good enough. You can buy yourself a little leeway on where within the system the station gets built by building in a bit of extra energy collection, or you can optimize designs for how far from the system center they get built to save a bit on resources, but in general a design with the static energy requirements equal to the energy collection is adequate.
Ok to simplify what would be your standard recommended number of each?