Router Battery Backup

Daruk

Honorary Master
Joined
Jul 18, 2008
Messages
44,890
Anyone know where I can get a 24v battery backup system similar to the 12v version?
Getting pricing on this:

1581409320907.png
Dual 12/24v output (12v 1a, 24v 3a) on a DIN rail
Anyone know of a similar product out there?

I will couple it with one of these on the 24v rail to power my laptop: https://www.diyelectronics.co.za/st...-converter-buck-in-45-32v-out-08-30v-12a.html
Or one of these:
 
Last edited:

Speedster

Executive Member
Joined
May 2, 2006
Messages
9,298
Unfortunately not, it cannot power my Asus AC68U with a DC buck converter (set to 17v), which draws just over 2.125 Amps. The data sheet says the max is 2 Amps too. So I had to revert to my Sherlo setup for now. For those that are struggling with the ports, it is a weird size (a little bigger than a 2mm socket). I had cut the split connector they gave to power and do a join to make it work. The back of the 430m is attached View attachment 781926
You're trying to draw 36w from a 30w power source. You'll need the 860p for this to work.
 

beans100

Honorary Master
Joined
Jul 30, 2010
Messages
11,378
Received the Ratel 412p, this morning (Seems I got the last from Communica). POE to Mikrotik outside and powering Mi Router 3 inside, so 2 devices. Was 100% battery when I plugged it in. Left it unplugged for an hour, with both routers plugged in. Didn't budge from 100%.
 

GavinHRC

Active Member
Joined
Feb 20, 2007
Messages
95
Only Vox customers? That’s a nice fit for purpose solution.
Sorry, I don't know, I'm with them. So it was free delivery as well, and I figured if it didn't work to backup their own equipment I would get a refund.
 

ripclaw

Expert Member
Joined
Dec 4, 2006
Messages
1,016
I'm planning on going the Sherlo route to power my Asus router (it requires 19V). Can someone please recommend an excellent buck boost device? Please supply a URL. Alternatively, please point me to a decent store in the DBN area.

Thanks.
 

ebendl

Expert Member
Joined
Sep 27, 2004
Messages
3,651
Lead batteries only like to get 50% DoD before you do damage to them (that is decrease their capacity)

Just go to communica and replace them with normal sealed 7Ah ones (~R150), then connect two 7Ah batteries in parallel. If they dont fit in the panel box then extend the connections and put the batteries on the floor.

Gel or not makes no difference because it's the heat in the roof/cupboard of the panel that kills the batteries over time. We only managed to get 6 months out of the batteries gel or not. Running two in parallel and they last 2 years or so, and as a bonus are perfectly happy for 10 hours runtime.

Heck if you are concerned, just wire three of them in parallel. Or use an old car battery - it wont be efficient to charge on the power supply but who cares if it takes 10 days to charge when it will last you just as long without power
Actually I think one of the reasons these batteries tend to die faster is because they have less time to properly recharge.

I've had loadshedding in stage 2 where power goes off say 21:00-23:00 on day 1, then off again 3:00-5:00 day 2. That means that they don't have a lot of time to recharge probably between sessions (especially since I am running 2x 7Ah batteries in parallel on a charger designed for 1 7Ah battery). So the first loadshedding doesn't deplete the batteries, but the second session does.

And in the case of the sherlotronic psu kills the battery since it let it run to 10v. So the next session it has less capacity, reaches 10v faster and kills the battery even faster.

None of these 12v 7Ah lead cell systems were designed for regular power outrages!
 

ebendl

Expert Member
Joined
Sep 27, 2004
Messages
3,651
So I ended up hacking together a quick battery monitor for my Sherlotronics PSU, now just runnning my Pi with Home Assistant.

1581445741096.png

It's a Wemos D1 with a voltage divider on the Analog-to-digital input (A0). The Wemos D1 runs off the 12v supplied by the Sherlotronics.

It runs ESPHome configured with the ADC sensor, MQTT and Deep Sleep. The latter was configured for 1 minute sleep, 10s awake to minimize it's impact on the Sherlotronics batteries. So I basically get a battery reading (between 0 and 15v) every minute, reported to Home Assistant running on the Pi.

I then get this (that was a 1.5 hour loadshedding session earlier tonight):

Screenshot 2020-02-11 at 20.31.42.png
and an automation which shuts down the Pi if the battery voltage goes beneath 12.1v:

Screenshot 2020-02-11 at 20.31.51.png

(The MQTT sensor is unavailable since the Wemos D1 is sleeping at the time).

Works great, haven't had the Sherlotronics run the batteries to <50% since I put this in place!
 

RichardZA7

Active Member
Joined
May 9, 2007
Messages
34
Hoping someone can shed some light, please:

Our alarm has two power packs (brand: Peak Power model TR6-HT_S042) each with an IDS 8Ah Gel battery in it, installed about 8 months ago. These are only used to power the external sensors (the rest is powered off the panel's own 8ah battery). Tonight they failed after 1 hour.

Instead of just replacing the batteries with the same I thought I should get bigger batteries but when I calculated the current draw to see what to get I do not understand how the current battery size isn't more than ample:

I traced which sensors are connected to which pack and looked up the manufacturer's (optex) spec for each one for current draw (@ 12VDC). I get to 58mA (1 x BX80 @ 38 mA + 1 x VXI-ST @ 20mA) on pack 1 and 77 mA (3 x VX + 1 x FIT-AT @ 17mA) on pack 2.

Since they were installed the longest outage I can remember (transformer fault) wasnt longer than 8 hours.

Even if you say 12 hours, there is no way that load would drain the batteries beyond 50% to damage them.

So now I'm stumped...

Before these packs were installed, all the external sensors were on a single pack (one of those Sherlo, assume 7Ah battery) which eventually couldn't handle the LS anymore and installer replaced with these two.

Anyone with experience with similar setup? Either the current draw actually much much higher than Optex says or these batteries or power packs are a load of rubbish.

I want to put in something that will actually last. Maybe I should switch to one of those Ratel 430m?

Thanks.
Measured the actual current draw off each battery (with AC off, obv) as follows:

External sensors power packs EACH: 70mA

Panel's battery: 420 mA

Now what is really interesting and perplexing is that even though the panel draws 6 times as much current meaning its battery (which is identical to the external sensors packs - 8Ah Gel) is drawn down to far far lower DoD but it has never run out during load shedding/power outage, unlike the flaky power packs.

I can only conclude that these power packs somehow destroy the batteries during charging whereas the panel (Paradox SP6000) doesn't.

To me, replacing with bigger batteries/multiple in parallel at the power packs seems like a short term solution as I would expect the packs destroy those too.

I'm thinking I rather use a single Ratel 412 in place of the two packs - their combined current draw of 140mA @ 12V = 1.68W, so given the 412's rating of 15W for 4 hours should give me 35 hours. My only concerns/questions would be whether:

1) the low current draw will damage the liion batteries in long term?
2) if there is a momentary loss of power when it switches from mains to battery (that will cause the sensors zones to open and trigger alarm)?

Or any other thoughts on this?

Thanks
 

GavinHRC

Active Member
Joined
Feb 20, 2007
Messages
95
Would you mind sharing a pic of the splitter cable that gets included? My ONT device (Gigahub 812G) uses a 8 pin power connector, but it appears as if some of the newer ONT devices use a round connector.
The splitter cable comes with a number of adaptors, all barrel connectors except one which looks a bit like a ps2 mouse connector, no 8 pin connector.
 

Speedster

Executive Member
Joined
May 2, 2006
Messages
9,298
Measured the actual current draw off each battery (with AC off, obv) as follows:

External sensors power packs EACH: 70mA

Panel's battery: 420 mA

Now what is really interesting and perplexing is that even though the panel draws 6 times as much current meaning its battery (which is identical to the external sensors packs - 8Ah Gel) is drawn down to far far lower DoD but it has never run out during load shedding/power outage, unlike the flaky power packs.

I can only conclude that these power packs somehow destroy the batteries during charging whereas the panel (Paradox SP6000) doesn't.

To me, replacing with bigger batteries/multiple in parallel at the power packs seems like a short term solution as I would expect the packs destroy those too.

I'm thinking I rather use a single Ratel 412 in place of the two packs - their combined current draw of 140mA @ 12V = 1.68W, so given the 412's rating of 15W for 4 hours should give me 35 hours. My only concerns/questions would be whether:

1) the low current draw will damage the liion batteries in long term?
2) if there is a momentary loss of power when it switches from mains to battery (that will cause the sensors zones to open and trigger alarm)?

Or any other thoughts on this?

Thanks
How many of the sensors do you have?
 
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