UPS Power


What kind of power would a UPS need to provide 4 hours of backup to a CMM Micro with 6 APs and 1 BH ?


Easiest way is to call APC and tell them how much you are drawing and how long you need it to run for. They will tell you exactly what you need.

I assume you mean 20M Canopy BH, not an OFDM unit.

Look at the specs for power consumption for each device. Add it up for the total load. In this case it’s about 60W

Then use P=IR

60W = I*24V

60W/24V = I = 2.5A System Current

Most off the shelf UPS’s are not designed for high and low temperatures but a good extreme temperature sealed lead acid battery can take it.

Thanks for the replies.

So, what kind of KVA would i need to get 4 hours of backup? ... ing-c.html

Check it out - this is my quote from TSI Power: These are extreme temperature batteries in weatherproof enclosures with charging system ready to fly.

Download the full line catalog to get the specs.

OEM prices for AirCloud will be as follows (for orders of 1 to 49 units):

- OutdoorUPS-8011 (24 vdc output with 24V, 5AH battery, 96 watts maximum): $860.00

- OutdoorUPS-8012 (24 vdc output with 24V, 10AH battery, 96 watts maximum): $1010.00

- OutdoorUPS-8126 (24 vdc output with 24V, 15AH battery, 96 watts maximum, uses larger cabinet. Note: This model will provide 4 hour backup time for load of 75 watts): $1240.00

Note: Above models are wall-mountable.
Optional pole-mounting hardware kit is $150.00.
Optional 150 watt battery heater is $150.00.

FOB: Antigo, Wisconsin, USA
Shipment: 3 to 6 weeks after receipt of PO, depending on order quantity

We just bought a new and two used Trip Lite inverter and hooked them up to some batteries.

Total cost for the new inverter at 48v to 120AC was around $800 with four batteries. We forgot to turn on the breaker and it ran for about 8 hours powering like 12 radios and a couple of switches…

We found the two 12v to 120 AC inverters on Ebay for like $160 each.

What is charging the batteries?

These Trip Lites do both.

So we just hook up our batteries to spec on the plus and minus of the device and it either has two AC plugs going out or the more expensive unit has terminals that we wired to a fuse box.

We found out the hard way at one site that hacking a solution could cause a fire when it melted the DC wires into the battery terminals.

I’m missing something.

I assume the hookup is:
Batteries --> Inverter --> Radios, CMM, etc.

What charges the batteries?

I am going to take a guess and say it’s similar to this model? … ventPage=1

I should note for everyone, and future reference that inverters are extremely inefficient. Most of your power will be wasted in the inverters conversion of the DC. I’d like to say that I enjoy seeing people be sucessful in their ventures, and hate to see problems. :smiley:

Our area is the worst in Philippines. While it is true we got the hydro electric dams, we are experiencing atleast 6x-10x power interruption daily, with atleast 2mins-15mins until it goes back.

My tower is powering:
(4) 5700APs,
(2) 2400BH,
(1) 24port 10/100 switch,
(2) 2610 routers,
(2) E1 Modems.

In a very cheapest way for a poor WISP. This is what I do:

I got a low battery APC 650VA and have it converted from an experienced friend, he took out the batteries and have 2 wires (positive and negative) with clips on it. I believe its running on 12V.

I attached 4pcs of 17plates internconnected batteries (+ and - are on the same positions). It can support up to 24 hours of total power black out.

and the UPS is also charging it, but very slow. I believe I’ve been using the batteries for around 16 months, and I only recharged twice using Battery Chargers, when the power interruption is reaching a 24 hours straight.

amd phreak wrote:
I am going to take a guess and say it's similar to this model? ... ventPage=1

The APS750 is more appropriately sized for the needs and pocketbook of a WISP at 750W and $300.

Dylan Oliver
dao wrote:
[quote="amd phreak":1q02aesb]I am going to take a guess and say it's similar to this model? ... ventPage=1

The APS750 is more appropriately sized for the needs and pocketbook of a WISP at 750W and $300.

Dylan Oliver[/quote:1q02aesb]

Must be that one..... I know the one I referenced was spendy, but I was trying to find out the exact model from the OP.