I've just done preliminary testing but I'm using this product to power two elements in an RV with a 12v battery, both require 5vdc. I'm using a Raspberry Pi and an XM receiver and I did a quick test with a 12V source and hooked up the PI and XM radios. The converter output voltage was measured at 5.01 VDC and both elements performed as expected. Haven't done a permanent install yet, but the product is solid with excellent heat dissipation so I don't expect any issues.
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