Micropop UPS

[rcosby]

We're trying to design a "micropop in a box" solution that will include a Netonix DC switch, 1-2 airfiber 5 (or 3 or 2)X backhauls, and up to 3 rockets. I'd like to be able to have at least a little battery backup for the system, preferably at 48V.

An suggestions on the UPS component? I've used meanwell DR-UPS-40 plus 24V power supplies in the past with pretty good success, but that's not 48V. Tycon's 48V battery charger / ups looks interesting but takes up a lot of space. Other thoughts we've played with include using a 48V power supply plus a 48V solar charge controller.

Any success stories or other ideas?

[sirhc]

If you use a WS-12-250-DC your batteries can be between 9-60V and still power 24V and 48V devices and you do not need conditioned power.

[Travis_WVN]

I'm having good results with the Powerstream 48V DIN-Rail mounted units. AC to DC48V, with battery backup option!
http://www.powerstream.com/48V-backup.htm

[rcosby]

I checked on that UPS, but they said they had a bad batch and the voltages wouldn't adjust correctly.

What is the difference between that and a normal 48v din rail power supply?

[sakita]

If you use a WS-12-250-DC your batteries can be between 9-60V and still power 24V and 48V devices and you do not need conditioned power.

When it comes to keeping the equipment size down, that voltage flexibility is very nice.

Meanwell DRC-100A + 1 @ 12V battery = good enough for a low-power site.

https://www.meanwell-web.com/en/product ... t/DRC-100A

We looked at 24V and 48V solutions (including Powerstream) but for the application we're doing having a single 12V battery helps make it all fit in the box. IIRC, the batteries we're using are Alpha 85GXL-HP which gives us plenty of run-time if the power goes out.

[rcosby]

I agree that battery will give you lots of run-time. But how long does it take to recharge a battery that size with that small of a power supply, allowing enough power for your equipment?

[sakita]

How long it takes to recharge depends on how long you run it down and how much of the 100W capacity you are using.

Seriously though, I haven't formally tested it. We should have decent charging output as we're typically only using 35W or so.

In your case, 2 @ AirFiber could be 36W to 51W by themselves. Add in 3 rockets and that's another 24W. Add about 8W for the switch.

So, your talking < 70 to > 80W right off-the-bat. You'd be close to the edge power-wise so it could be a long recharge if it can handle it at all.

In our case, we're typically 35W to 50W which allows plenty of temperature de-rating as well as recharge current.

Maybe Meanwell will come up with a 200W version.

[rcosby]

I've made pretty good headway on our micropop box.

I'm using a 240W (5A) 48V power supply with four 12AH batteries and limit our load to ~100W.

Someone smarter than me recommended I don't put more load on than 20% of our battery AH capacity. In other words, if I use 12AH of battery, I should only allow 20% of 12A = 2.4A or 115W of load. I'm estimating about 2.5 hours of run-time if I try not to ruin my battery by going too low. I will use the netonix port shutdown features as a "LVD."

[sakita]

So what power supply are you using?

[rcosby]

MeanWell SDR 240-48