Reddit mentions of Ubiquiti INS-3AF-I-G Indoor Gigabit Adapter

Upgrading to the US-8-150W is the best option if you're going to start adding more cameras. In the meantime you could pick up one of these to convert the PoE to passive.

https://www.amazon.com/Ubiquiti-INS-3AF-I-G-Indoor-Gigabit-Adapter/dp/B01N9MJL91/ref=sr_1_1?ie=UTF8&qid=1501622162&sr=8-1&keywords=ubiquiti+instant+802.3af

If you are planning on getting UniFi you need to look for a sticker...
I had to get a few of these... Ubiquiti INS-3AF-I-G
because I have some older UniFi AP's (pre ~ 8/2016). Remember to check for the sticker in the upper right!

You can use one of these to bring the 48V down to 24V. But, it seems kind of useless with the unmanaged POE switch you have; these are only really useful if you want to remotely power cycle the POE devices from a managed POE switch.

I see. I didn't see anything in the manual to indicate what spec they use. I'd wager it's not 24V passive but rather the standard PoE (802.3af)

If the Amcrest software has the ability to import RTSP streams then just plug the cameras into a network switch and forget plugging them directly into the NVR. Use the supplied PoE injectors.

If you really want to plug the cameras into the NVR. You can convert 24V passive PoE to 802.3af with this...

https://smile.amazon.com/Ubiquiti-INS-3AF-I-G-Indoor-Gigabit-Adapter/dp/B01N9MJL91

I've been trying to figure this out off and on for the past week. Wish I posted here sooner. It helps when you ask someone who understands this stuff. Thanks for your help.

So now that I am getting a grasp on this, I figured there might be an adapter for this sort of thing. Do I understand correctly that the INS-3AF-I-G solve my problems and let me use PoE between these two devices?

As a sidenote, you're right about the PoE out on the standard ERX. It needs PoE in... its PoE passthrough. I'll have to get the other model.

https://www.amazon.com/Ubiquiti-INS-3AF-I-G-Indoor-Gigabit-Adapter/dp/B01N9MJL91/ref=sr_1_1?ie=UTF8&qid=1499880478&sr=8-1&keywords=ubiquiti+802.3af

As for the switch config, generally speaking think of it as a tree, your ER-X internal switch is the root of the tree. You want the tree to have as few levels as possible.

https://www.amazon.com/Ubiquiti-INS-3AF-I-G-Indoor-Gigabit-Adapter/dp/B01N9MJL91/ref=sr_1_3?keywords=Ubiquiti+Instant+802.3af+Passive+PoE+to+802.3af+Adapter&qid=1567204500&s=gateway&sr=8-3

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THANKS, for some reason google didn't show it with ethernet to wifi, but it got it with wifi to ethernet.