I was hoping to have 1 device that could be a home router as well as monitor voltage from a battery backup source. So I'm looking for a lower cost router that has Wi-Fi and has voltage monitoring. So far I've found the hAP lite, ac2, ac3, ax2 and L009 do not have voltage monitor unless I missed it. The other 2 options are hAP AC or Audience. Do they have voltage monitor? If not I will probably have to use 2 devices. The lowest cost Mikrotik I know of with voltage monitor is the hEX.

The map, should have It:
https://mikrotik.com/product/RBmAP2nD

it is definitely cheap and also has wifi, the doubt may be about its capabilities as router and if two ethernet ports are enough.

The hap AC has voltage monitor alright:
https://mikrotik.com/product/RB962UiGS-5HacT2HnT

Thanks jaclaz! I didn't think about the mAP. Yes, it will work as a monitor. Ordering a hAP AC to test.