If you can find one (power supply) that delivers 40 amps, and fits your budget, go for it. It will be less likely to have a voltage drop with higher loads applied to it. The Rig Runner is set up so that the input must have a fuse that is equal to, or greater than the total of all output circuits you're running, and each output circuit has its own fuse for the current that circuit will draw. So, the 4005 has 6 connections, 1 input and 5 output. You can run the input into any one of the connections (even though the one at far left is designated as input on the front of the panel), and all the others will draw their current through that one. Each channel that is further away from the input will get less than the channel nearer to the input if you have something connected to the close ones. Rig Runner recommends running the higher drain circuits closest to the input. I have a 40 amp fuse in my input channel, which I am using on the right end; the two channels to the left have 10 amp fuses, and the furthest three have 5 amp fuses, for a total of 35 amps. I've found that I can probably drop to a 7.5 amp fuse where my 10's are, so I could probably drop the main fuse to a 30 amp fuse. Right now I'm running my mount and dew heaters through the Rig Runner.
Current draw is additive, so if you know what each of your accessories uses, just add it all together to get the minimum you need to deliver. I'd add at least 20% to that number. For instance, my mount draws less than an amp when tracking, but as much as 4 amps when slewing. Dew heater current will vary with the number of strips you're heating and how much you have them turned up. Way too much is better than marginal or not enough.
Edited by Luna-tic, 14 February 2019 - 08:16 PM.