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There's a tech that gives you 100 Research points/Sol for each Explorer you have.

Multiple explorers will incur a "collaboration loss", so it won't be a net increase of 100 for each one, but it still is an increase, which is helpful.
 
Yeah I am seeing my research increased by 180 from my two explorers.
 
I often use them to recharge my Rovers when they are out gathering metals.

I assume you mean the RC Transport since the Rovers only gather metals when they are building something in range and have the Rover Command AI research that gives unlimited battery life.
 
yup that's pretty much what they do, i said this in another thread but if they had a transportation system then the explorer could have been used as a transport rover.
 
Yes, the explorer is somewhat disappointing. Most of the time it's parking somewhere near a powerline, generating some research and waiting for an anomaly. Didn't had the need for a 2nd, yet.
 
I often use them to recharge my Rovers when they are out gathering metals.

Haha mine serves similar purposes (except I mined it all already so not for that). It sits in the middle of the route between my two Mega Domes where all 3 of my transports go ready to assist any that might run out of juice. Though that has been made rare since I started building cables near stockpiles and when setting up a route putting either the load or unload spot on a cable near the stockpiles (they charge themselves to full and continue their route!).

So Exploration rovers are only good to provide that tiny bit of research and serve as emergency mobile battery once you got all the anomalies.