If I hook up say, four heater strips to this controller, theoretically how many amps (not amp hours) would the unit draw?

This will depend on how high the controller is set on each channel and the size of each dew heater strip. The larger strips can draw about 1 to 1.5 amp on a normal night and the smaller ones would use only milliamps. So a typical night running 4 heaters would draw about 2 to 3 amps for most set ups.

can i connect the thousand oaks directly to my celestron 8 in. evolution for power with a usb adapter or do i need to buy a power tank?

I believe you'll need more power than a USB typically supplies. In my case I use my mine at home and use a power supply I purchased here at Amazon. It is 120v AC and has a 12v DC lighter adapter that I plug the Thousand Oaks unit into. I ran a 3 plug adapter on a short cord (also purchased here) that is strapped to the leg of my telescope tripod and plug the scope, adapter and laptop into it. That way I have one cord from the scope setup to the house, instead of three all over the ground. Hope that helps.

What is required amperage to run unit using a a/c to D/c transformer?

I think it would depend on the total maximum power draw of your heater strip/element configuration. A single small heater may draw well under an amp while four large strips could draw closer to 6 - 8 amps in total.

How do you disable battery saver feature? I’m running it on a dedicated dattery and don’t need to worry about battery drain.

You can turn off this function when using a dedicated 12 volt battery factory Default is turned or =on. You can also go to Thousand oaks Web and they will also have some info as well.

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