Curious if it's using ground based or space based bonus % for how much each satellite provides.

In my current playthrough, Navuis gets 300% in orbit, and 100% in atmo. Each satellite is adding 1.8 MW to my current production though.

Each power satellite generates as much as 10 solar panels with that planet's solar_power_in_space multiplier, so 1.8MW sounds about right - 60kW * 10 * 300%.

Awesome. I asked since the information tab didn't reflect that (It says 6 MW, which is what I was curious about).

Yeah, that was the initial value for base Factorio before Space Age released (and if you play without SA it's still 6MW). I've updated the Details section to add SA-relevant info, thanks for your post! :)