cryptocompare.com's calculation questions

Hi,
I'm a newb in the crypto mining fun times.
Currently I only have my geforce 1060 (using NiceHashMiner) doing some mining for me just for fun. However that's where my question comes in. I'm looking at setting up a Raspberry Pi 3 with a USB hub and a bunch of GekkoScience 2PAC attached to that hub.

Now according to the stats of what that unit can do, 15 GH/s, up to 20 OCd. It's advertised .33 W/GH (so 15*0.33=4.55) so about 5W per unit.
My Geforce 1060 is doing just under 300H/s and I'm getting about 0.00015 BTC per day. Now not sure of the wattage of this computer but it's much more than 5W.
According to cryptocompare.com the GekkoScience will make 0.00000280 BTC per day at 15 GH/s.
Is the math on the site wrong? If I was to look at the math it looks all wrong as my geforce at 300H/s is barely a fraction of the 15GH/s of the Gekko.

Also, if I'm just trying to get the unit to pay for itself, will the Raspberry Pi 3 and a couple Gekkos be able to do that? Be probably about $300 CDN for the hardware in the end. I eventually want to try a solar/battery setup with this setup and see if I can make BTC using renewable power.

Thanks for your time and helping a newb out!