Quality usually cost money. How do you think they manage to sell a compressor with that performance level for $500? Corners have to be cut somewhere! There are many power supplies you can buy on Amazon eBay or AliExpress that are from China for much lower price. However I don't believe the quality will be much better than what was already shipped with a compressor. I will run mine with the power supply that came with until it dies and then figure something else out. Hooking it up to car batteries won't work for very long without the engine running or your battery will be dead. Besides without your car running with a 30 amp load you'll be lucky if your car battery puts out at 12 volts . The power supply coming with the compressor puts out over 13.5 volts. If you don't mind running your car while you're using your compressor that's a viable option.
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