I am trying to EHP tank my hulk, but have no frame of reference for what kind of DPS it will need to tank while mining. Traditionally I had monitored my hulk and just popped rats with my drones whenever they bothered me, but now I want to just semi-afk and tank, but want max EHP to deter or thwart suicide attacks. I am looking for something something like: 0.8 = 50dps 0.7 = 100dps 0.6 = 150dps etc. Representing the max that you would reasonably have to tank in a normal roid field if you didn't care to destroy the rats.
Generally the way people fit a Hulk for high tank is to get high shield resistances and equip a strong shield booster. The biggest hurdle you will likely face is running into CPU limits, especially if you're using Mining Laser Upgrades.
You have several options for your slots.
2x Mining Laser II for max mining yield, but CPU for the rest of the fit will be very slim.
2x Expanded Cargohold II for cargo capacity.
Damage Control II and a utility low, like a Co-Processor for extra CPU or a Power Core for extra Power Grid.
Small Shield Booster is pretty much a must unless you're going to kill every rat that comes after you or take short mining trips. The quality of the booster depends on the difficulty of the rats you're likely to encounter. Tech II probably wouldn't hurt for high sec. Gistii A-Type and B-Type are used for lowsec and nullsec rats.
Resistances! Some use Invulerability Field IIs if they have the CPU to drive them. If CPU is a limiter then go for Shield Resistance Amplifiers. They give less resistance but they use less CPU and no capacitor.
Medium Shield Extender. Gives you a nice EHP boost but uses a lot of powergrid. You won't be able to fit one unless you use something to extend your powergrid.
3x Modulated Strip Miner II with Tech II mining crystals if you know what ore you'll be mining.
3x Strip Miner I if you are going to be mining anything in sight.
Medium Cargohold Optimization for more cargo.
Medium Capacitor Control Circuit if you run a lot of active modules (Invulns, Shield Booster, Damage Control, etc) and need to stabilize your capacitor.
Medium Core Defence Field Extender to give more shield capacity.
Medium Anti-(Damage Type) Screen Reinforcer for even more shield resistance. Use these to plug holes in damage types you're weak against.
Ultimately, your fit will depend on your skills, most importantly Electronics V, Engineering V, and Mining Upgrades IV to give you maximum breathing room.
Your fit will also depend on how much you're willing to spend on modules. The more you spend, the hardier your ship will be, but also a greater loss if someone puts up the extra effort to gank you.
Experiment with EFT to find what fits you best.
I'll leave you with my favorite fit:
[Hulk, Happy Tanking] Mining Laser Upgrade II Mining Laser Upgrade II Domination Heat Dissipation Amplifier Domination Magnetic Scattering Amplifier Domination Magnetic Scattering Amplifier Gistii B-Type Small Shield Booster Modulated Strip Miner II Modulated Strip Miner II Modulated Strip Miner II Medium Anti-Kinetic Screen Reinforcer I Medium Anti-Explosive Screen Reinforcer I
All level V skills: 12,943 HP - 80% EM resist, 73% Thermal resist, 74% Kinetic resist, 75% Explosive resist. 126 DPS cap-stable omnitank. Domination Amplifiers are 10-20 million apiece and only use 17 CPU apiece! Gistii B-Type runs from 30-50 million.