WARNING - doing this mod will void your Mikrotik warrantee - if you do so - you do so at your own risk !
A little background info first:
I run a fiber-to-the-home ISP and a WISP. I have a dozen-plus remote towers and four mini-NOCs. My mini-NOCs and most of my remote towers do not have backup generator power - or they have backup generators needing repair from last winter to get the generators working again. (( I totally hate remote backup generators because they can fail during the winter when the snow is over 6-feet deep and a generator service company can't get to the remote mountian-top located generator to repair it )) -and- (( I totally hate AC powered UPS systems because they run down the battery after a few hours when the power goes out - sometimes hours to more than a week without power )). Sooo, I've been switching to only 24-Volt-DC devices were possible. It's good for me that my hundreds of outdoor APs are Mikrotik devices with PoE 24-Volt power. My problem is locating Mikrotik 24-Volt DC powered PoE out ethernet switches. ((( Yes there is the NetPower16-P , but that only has 16 PoE ethernet out ports and I need up to24 to 48 PoE out ethernet ports ))). Sooo, this is my first test mod on a Mikrotik CRS328-24P-4S+RM to convert it from AC power to DC power.
I wish Mikrotik would come out with an optional DC power wiring kit that does the same thing as my mod for their larger PoE switches.
This I performed on a Mikrotik CRS328-24P-4S+RM ( 24 PoE ethernet ports & four sfp+ ports )
My next mod will be on a Mikrotik CRS354-48P-4S+2Q+RM ( 48 PoE ethernet ports & four sfp+ ports & two 40G QSFP+ ports ) This mod will be for my mini-NOCs that do fiber-to-the-home (GPON) where I need/use 10-Gig or faster fiber connections
For my CRS328-24P-4S+RM DC-power mod I performed the following:
- remove the internal AC power supply
- created a DC wire harness for the CRS328-24P-4S+RM. ( externally I have connectors for external 24-Volt-DC operation and an optional external 48-Volt DC power supply.
-- Note; The CRS328-24P-4S+RM powers up and works fine on 24 volts only without the 48-volts connected. The optional 48 volts is only needed if you want to PoE power a 48-Volt device.
- For my external 24-Volt DC power supply, I am using an ALG 24-Volt-DC-UPS ( a 24 Volt power supply which will also has connectors to connect external batteries ). Thus when the power goes out , everything keeps running and the world still spins.
-- Note: My battery bank will be large enough ( Amp-hours ) to run a minimum of 1 week without utility power.
I have attached some pictures of my 24-Volt-DC mod on my CRS328-24P-4S+RM.