Use relay directly from pi or use relays to control relays?

[/RaspberryPi]

I have a battery pack that has a voltage of 24v - 28v. I found this relay on Amazon that says it can do up to 30v dc or 10a link and I have a 24v fan that pulls 8a. I was going to just attach the relay directly to the pi and run my fan circuit through it. I've been reading that some people run the relay on the pi just to send a control signal to another relay that actually controls the fan circuit. What would be the right method?
submitted by /u/DieingFetus
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Source: https://www.reddit.com/r/raspberry_pi/c ... relays_to/