I did order one. I don't care if it's a little noisy, since I'm going to use it to run a
Noise Generator, that needs 24VDC @ 0.6A.
While I was shopping on Ebay, I did see some of these 'Buck converters' products rated for more amps.
They had heat sinks attached to the reg chips.
150W DC DC 10 32V to 12 35V Converter Boost Charger Step Up Booster Power Supply | eBay
I noticed they did have a higher price tag too.
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I wonder how well these devices would work as a solar charger?