I didn't really think it would convert the whole 8-40v range to 13.8v. I connected it to a desktop power supply and to my surprise it actually works as advertised. It boosts the low voltage to 13.8V and drops the high voltage to 13.8V. It's NOT EXACT at 13.8V over the whole range, but it varies by a maximum of 0.2V. My PSU can only go up to 32 V, but I'm assuming it will work up to the advertised 40V. I have no way of applying a 10A load, but it handles a 4A load with ease.
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