Router Battery Backup

Ratel is max 2A on the 12V right? so 24W of juice you can squeeze out of it just on the 12V line

What's your solution for the monitor or do you run it headless?
 
maumau said:
Where do you guys get extra cables for the Ratel? Router is 9v, CPE is 12v so the splitter cable won't work.
Click to expand...

The Ratel 860P has one switchable 9V/12VDC output port so it will work.
All the Ratel 860P ports are 5.5 x 2.5mm DC barrel sockets (except for the USB and PoE port obviously).

I made my own cables up. I suspect other people do the same. The center pin/inside part on DC barrel connectors is almost always the positive terminal (negative on outside) but I measured the ONT and router power supplies with a multimeter just to be certain before soldering my jacks onto some cable.

One can find 2.5mm to 2.1mm cables online if you're not able to make your own.
 
waylander said:
sucks my raspi cluster needs 5v3a for each node :/
Click to expand...

Most power supplies including the Pis have over speced supplies to ensure a stable voltage as well as be able to power all the peripherals one may plug in.
Apparently the Pi 4 consumes 3.4W at idle and 7.6W at full load but I'm not sure if that is the 2GB, 4GB or 8GB model. The amount of RAM will affect the power requirments.

If the max is 7.6W then all three could consume up to 22.8W. It may be possible to use the 24V@24W PoE port with a DC-DC buck converter to step down to 5V but it's a bit on the tight side and there will be some loss through the converter.
If you're not running the Pis at full load (e.g. GPUs are idling but CPUs are busy) then it may work.
 
waylander said:
sucks my raspi cluster needs 5v3a for each node :/
Click to expand...
A couple of these should do it:

Router Battery Backup

Yes, throwing good money after bad. That UPS has standard lead acid batteries that don't like cycles and is also inverting DC to AC which has a loss factor. Gizzu and co is lithium, and is straight DC so no losses. Many thanks to all who have jumped in to help me. So if I get the Gizzu 8800mah...
mybroadband.co.za mybroadband.co.za
 
ginggs said:
A couple of these should do it:

Router Battery Backup

Yes, throwing good money after bad. That UPS has standard lead acid batteries that don't like cycles and is also inverting DC to AC which has a loss factor. Gizzu and co is lithium, and is straight DC so no losses. Many thanks to all who have jumped in to help me. So if I get the Gizzu 8800mah...
mybroadband.co.za mybroadband.co.za
Click to expand...

Oof that's handy, wonder if there's any USB-C premade... USB-C is a bitch to make on your own
 
Paul_S said:
The Ratel 860P has one switchable 9V/12VDC output port so it will work.
All the Ratel 860P ports are 5.5 x 2.5mm DC barrel sockets (except for the USB and PoE port obviously).

I made my own cables up. I suspect other people do the same. The center pin/inside part on DC barrel connectors is almost always the positive terminal (negative on outside) but I measured the ONT and router power supplies with a multimeter just to be certain before soldering my jacks onto some cable.

One can find 2.5mm to 2.1mm cables online if you're not able to make your ow
Click to expand...

Thanks for the info, will order a couple of extra cables online, it's just strange to me that they aren't freely available at places like Matrix and Incredible. Or even as optional extras with the Ratel and similar.

.... Or even why a private guy hasn't jumped on the bandwagon and made a few hundred to sell. Communica must have kilometers of left over cable, it comes in 5m lengths, most people buy 2 x 2m so for every Ratel sold there's at least 1m wasted (not really wasted, just extra).... And that's only the Ratel!
 
Last edited:
Xiphan said:
I am now sure that the specs are wrong. I just tried powering a UAP-AC-LR using the UltraLAN PoE ports and while it had no problem powering the AP its uplink speed was only 100, not gigabit.

View attachment 1013672

I also made sure it wasn't a problem with the cables I was using by using those same cables with the PoE injector that the unit comes with. Using the PoE injector I was able to achieve a gigabit uplink.
Click to expand...
Thought so. Tested mine a while back and also on got 100mbps.
 
Paul_S said:
Most power supplies including the Pis have over speced supplies to ensure a stable voltage as well as be able to power all the peripherals one may plug in.
Apparently the Pi 4 consumes 3.4W at idle and 7.6W at full load but I'm not sure if that is the 2GB, 4GB or 8GB model. The amount of RAM will affect the power requirments.

If the max is 7.6W then all three could consume up to 22.8W. It may be possible to use the 24V@24W PoE port with a DC-DC buck converter to step down to 5V but it's a bit on the tight side and there will be some loss through the converter.
If you're not running the Pis at full load (e.g. GPUs are idling but CPUs are busy) then it may work.
Click to expand...

Just tested on a single Raspi4 8GB with nothing connected but LAN, stress-ng full load (CPU) ate 8W at max lol

Good to know I can get away with smaller PSU, might as well connect it to the Ratel now :thumbsup:

Just need to now get some more Ratels, and some decent USB-C cables from hdcabling
 
Nvm a short stress test had the Pi KP @ 1800Mhz

Back on 5v3a and stable. Oh well
 
waylander said:
Nvm a short stress test had the Pi KP @ 1800Mhz

Back on 5v3a and stable. Oh well
Click to expand...
my pi4, 8GB is connected to the Ratel 860 usb port....i expected preformance to drop and dietpi to complain but its been running fine to my surprise, how did you test it?mine is also overclocked i think to 2000
 
bar1 said:
my pi4, 8GB is connected to the Ratel 860 usb port....i expected preformance to drop and dietpi to complain but its been running fine to my surprise, how did you test it?mine is also overclocked i think to 2000
Click to expand...

stress-ng with all CPU maxed - stops responding withing 2 seconds and needs a hard reboot

Will look at attaching some meters to the Pi to measure actual draw from the Ratel vs brick
 
Xiphan said:
I am now sure that the specs are wrong. I just tried powering a UAP-AC-LR using the UltraLAN PoE ports and while it had no problem powering the AP its uplink speed was only 100, not gigabit.

View attachment 1013672

I also made sure it wasn't a problem with the cables I was using by using those same cables with the PoE injector that the unit comes with. Using the PoE injector I was able to achieve a gigabit uplink.
Click to expand...

To get around this I made up a RJ45-to-2.1mm DC cable.
It plugs into the GIZZU POE out port and powers a separate Gigabit POE injector.
I'm using it with a Unifi AC LR.

Gizzu GB POE.jpg
 
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