Lowsec Space and Sentry Guns

Senties everywhere are the same, now matter how they look. They do the same amount of damage of the same type no matter which NPC sov it is. So if you can tank them in Amarr regions say, you can tank them anywhere with the same setup.

Senties do all types of damage, but more thermal and kinetic. These are the stats that were posted pre-Revelations and might be changed in future patches.

EM damage: 16 - 18%
Explosive damage: 16 - 18%
Kinetic damage: 28 - 32%
Thermal damage: 28 - 32%

Damage Mod: 3.5
ROF: 1.75
DPS: 176 per gun

So with two guns you have 352 damage points per second. If your bs can tank that (note that it will be lower with whatever resists you have), then you'd be ok with 2 sentries focusing fire on you. More sentries require more ships to tank. The guns actually switch from ship to ship every 30 seconds. Gallente HAC would be ideal for tanking because they get bonus to kinetic/thermal resistances, and also Gallente command ships. Deimos, Eos, Astarte, and Ishtar are all cool.

The advice I read for a battleship, is that you need a bs stuffed with T2 mods, with cap boosters or NOS for prolonged tanking. People cannot remotely repair you or transfer you cap, because then they become criminally flagged to sentries. But you can have a person or two standing by to NOS their cap for tank. Once you run out of boosters or the other person runs out of cap, you won't be able to tank them any longer. Generally because most low sec has more than 2 guns per location, you have teams of bs and hacs do the tanking.

Most solo gate gankers just rely on being able to kill the target quickly enough before the guns get them. That is why they mostly go for haulers and smaller ships. Alternatively, you can snipe outside of the sentry gun range. But you'd be able to do only limited DPS as all long range weapons do less damage than shot range. So once again you'd be limited to killing ships with fewer hp.