You better check that they're real 512GB micro-SDs, especially if buying them online, as there are a lot of fakes around. SD Insight is useful for this.
It would help if you stated what security system you're implementing -- what type, brand, model I.D.???
The documentation that's included (or a reference to manuals on their web site) should state what type of cards, capacity limitations, and set up info. Don't just guess or make assumptions, follow their directions.
You need to make sure the whatever it is thing can use SDXC type micro-SDs, in order to use larger than 32GB. Also 512GB micro-SD have only just come out and are still quite expensive, maybe around $200-300, so beware of any vendors selling them online cheap.
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