So im building a large ship explorer, however i don't know which pd to take. What do you suggest? I'd like a short time between each boost but nothing too heavy. Also if i can get it where 4 pips to wps will allow me to fire my mining lasers indefinitely then all the better.
This would be the build once everything else has been engineered
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It looks like you could get away with a 6D engine focused + super conduits PD (charge enhanced will not have enough power in the capacitor to boost). However, this will not allow you to run the mining lasers indefinitely (they will deplete in 14 s, which is not enough to burn through an asteroid). If you really want your lasers to run indefinitely I would go with a 7D charge enchanced. Super conduits will then not really do anything for you as your time between boost will anyway be just above 6 s and your lasers will already be running indefinitely - so you can pick whatever other experimental you fancy, I would go with stripped down for a tiny bit of extra jump range or flow control to us a little less power depending on the rest of the build.
If you set your module priorities correctly you should also be able to get away with a smaller power plant. For example, your SRV can have priority 5 without any issues as the only time you will use it is when the thrusters are off leaving a lot of left-over power anyway. I would also switch out some modules and leave others at home for an exploration ship, but that is another issue not directly related to what you asked for.
The only PD engineering worth having is Charge Enhanced with super conduits (I think that's what it's called). The only other possible one you'd use would be engine focused for exploration.
Charge enhanced + super conduits is the general go-to. However, I think it needs to be evaluated for the purpose of the ship and the aims of the pilot.
For pure exploration I would actually default to engine focused. You are not going out to shoot at anything and nothing is a priori going to shoot at you. Any impact on your shields is going to be temporary (or fatal), leaving ample time for the shields to recharge (or it doesn't matter). Engine focused will therefore let you pack a smaller PD while still maintaining the ability to boost frequently.
For laser mining I would almost always slap on weapon focused to run more mining lasers.