The AD-155 is 150W max load.
What I would do is a Traco TSP 48v power supply (180, 240, 360 or 600W),
a TSP-BCMU360 in 48v mode and a Mean Well 48 to 24 RSD. The BCMU360
takes a 12v SLA and does an internal DC-DC conversion. I haven't had any
problems with them. I have two in the field right now maintaining 37Ah
Deka's.
On 3/9/2016 2:06 PM, SmarterBroadband wrote:
That Meanwell sounds right. I will have to see if they make a more
powerful one?
*From:*Af [mailto:[email protected]] *On Behalf Of *Mathew Howard
*Sent:* Wednesday, March 09, 2016 11:39 AM
*To:* af
*Subject:* Re: [AFMUG] Small DC Site
Is there really any advantage to using something like an AD-155B with
a UPS function over just connecting the batteries in parallel with the
load to a normal DC power supply and setting the voltage properly? It
seems like there would be less parts to fail and it'd be easier to add
redundancy if the batteries were just connected in parallel.
On Wed, Mar 9, 2016 at 12:52 PM, Chuck McCown <[email protected]
<mailto:[email protected]>> wrote:
A pair of power supplies that are capable of pulling the load and
charging the battery.
For example, if you needed 200 watts for your 24 volt loads, you need
8.3 amps. Round that up to 10 amps.
Then you have to decide how long you want this thing to last without
commercial power. I would think 24 hours is a minimum. So 10 amps x
24 hours is 240 amp hours of battery.
It is always a safe figure to charge a battery at .1C or 10% of its
capacity or less. That would be 24 amps to charge the batts after a
power outage, plus 10 for load = 34 amps of power supply. You could
get by with 20 amps, just will take a bit longer to charge.
Lots of 20 amp 28VDC power supplies out there.
Rule of thumb double your load power or more to size the charger.
*From:*SmarterBroadband <mailto:[email protected]>
*Sent:*Wednesday, March 09, 2016 11:45 AM
*To:*[email protected] <mailto:[email protected]>
*Subject:*[AFMUG] Small DC Site
What are people using to power small DC sites. Option 1 up to 150 -
200 Watts, option 2 up to 300 – 400 Watts. I’m looking for a DC UPS
that can charge attached batteries. Need to have 24 and 48 volt.
