So how many sol/s would you get from a 480? 300?

So im currently mining on 5 r9 380x's, 6 rx 570's and 1 rx 480. Im getting about 275-285mh/s on ethermine.org pool. im sucking about a total of 2850 watts at 9 cents per kwh (cheap i know).

Im making what like 42$ a day on average which im happy with BUT ZEC is worth about the same as ETH so i was thinking of diversifying my systems and mine 2 different coins just in case, i have 3 rigs, maybe make my 2 gpu rig (one 570 and one 480) mine zec and see how it goes.

Only thing is its 1000000x more confusing than ETH tutorials. Setting it up is around the same way but im wondering why calculators say i will loose money (like 1.50$ per day) with a 2 gpu rig sucking about 300-350w max when with ETH ill make money either way.

Mostly i dont get what is the difference between sol/s and mh/s. whats the conversion rate of the two?

Then what kind of hashrate would i expect from a 2 gpu rig...would it be in single h/s or kh/s or mh/s because on the calculator if i put in sol/s or h/s i will loose money so i need to make at least 1000h/s to actually make money. but then factoring in power consumption...etc...

any help would be greatly appreciated!

edit: im seeing people report anywhere between 350 and 25 sol/s on 480's...wtf is this and all posts are between 2015 and now.