Hoping for some guidance… The Sim Injector AC power adapter is 12-56v and the Injector doesn’t power up with direct wiring to a 12v bus bar. Do I need a DC booster and is there a recommended kind of device? Thanks!
You’re right - the webpage says 12-56v… I would have expected the SIM injector to power up at 12V and just POE output not to work. I bet @sitloongs would know if it should work on 12v or not.
I would normally use a 48V boost / step up voltage regulator like this one below when I need POE output from a 12V supply:
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We tested this is in the past and SIM Injector will power up from 12V, but there will be no PoE output. Thus if you need a PoE to work it would be best to connect 48-56V I would recommend 56V). Hopefully this helps. Let us know if there will be further questions 
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I have many of these running on 12V without any issue. As others have said, it won’t produce PoE power without being supplied 56V, but works otherwise.
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Hello @shallowwaters,
We use with our clients the PepXIM SD-PMU to supply a clean 48VDC to the PepXIM SIM Injectors and also to other Peplink|Pepwave devices such as the SD-Switch series and also the Series X routers, such as the MBX HD2/4.
https://www.peplink.com/products/iot-sd-pmu-pdu/
https://risingconnection.com.au/product/sd-pmu/
Alternatively, you can get a 12VDC to 48VDC DC/DC Inverter or if you only have a single device requiring PoE 802.3at/af, there are several manufacturers out there that make “12VDC to 48VDC PoE 802.3at/af injectors” (do a search in your favourite search engine). Here is a couple we found:
https://www.tyconsystems.com/DC-to-DC-Converters_c_16.html
https://www.mse.com.tw/en/product-c152128/DC-PoE.html
Check with your local certified Peplink Partner for what they recommend for your application, the company that supplied you with the SIM Injector should be able to guide you, they may even have suitable stock on hand.
Happy to Help,
Marcus 