I'm 99.9% sure that load voltage and battery voltage are one and the
same.
If you don't want the load voltage to vary then you have to add a DC/DC
converter. You probably don't need to.
------ Original Message ------
From: "Darin Steffl" <darin.ste...@mnwifi.com>
To: "memb...@wispa.org" <memb...@wispa.org>; "af@afmug.com"
<af@afmug.com>
Sent: 3/20/2017 3:03:33 PM
Subject: Re: [AFMUG] [WISPA Members] DC Power Site
So it looks like we will go with the 24v system (AD-155B) for now.
Does the voltage adjustment screw only change the Load voltage or also
the battery charge voltage?
What happens if the batteries run completely dead? When AC power is
restored, will the power supply still boot up properly and provide DC
power for our load and start charging the dead battery?
What do you all recommend for fuses and breakers as well for a
microsite like this? Any pics and/or part numbers would be greatly
appreciated. I've found plenty of info on the DIN rail solutions but
not seen any pics with the AD-155 yet.
Thank you all!
On Mon, Mar 20, 2017 at 1:51 PM, David Hulsebus
<dhulse...@portative.net> wrote:
I discussed this last week with a power engineer.
We plan to use 4 Trojan T105 batteries in series to create a 24V
string.
With 280 Ah batteries they said we would need a 40 amp charging
circuit if I want to run from DC while batteries are also being
charged. I use 8 amps of continuous power.
Here are the two devices he spec'd for the project.
DLS-27-40/IQ4 Iota charger
RSD-300B-24 Meanwell 24V DC output 11.3A
The power guy said the biggest mistake made is not sizing the charge
device large enough. Sure we only need 8 amps, but the batteries may
consume 30 or more during a bulk charge.
Dave Hulsebus
On 3/20/2017 2:10 PM, Scott Lambert wrote:
We've had a lot of failures with the AD-155B. That could be something
we're doing wrong.
If you end up with a couple of AFs or some LTE gear onsite, you will
want more than 150w. I'm leaning more toward having a 24v power
supply that knows how to maintain batteries and running the load
straight off the battery bank.
On March 20, 2017 12:28:39 PM CDT, Josh Baird <joshba...@gmail.com>
<mailto:joshba...@gmail.com> wrote:
Just use a AD-155B or AD-155C like has been said. Don't bother with
12V.
On Mon, Mar 20, 2017 at 1:25 PM, Darin Steffl
<darin.ste...@mnwifi.com> wrote:
Justin,
Our planned load for this site is only 70 watts for two backhauls,
an omni, and netonix. This should be well within range of the 155
watt power supply, no? Our ethernet runs are also only 30 feet or
less.
I also don't see that the voltage is adjustable on the AD-155
though? Spec sheet doesn't mention it or have a picture of that.
On Mon, Mar 20, 2017 at 12:21 PM, Justin Wilson <li...@mtin.net>
wrote:
Don’t skimp by going with the lower voltage. You will run into an
amperage issues pretty quickly. Seen a 12-13 volt site with 1
backhaul and an omni run into amperage issues within a week.
Voltage is fine, just way too much amperage. It’s not worth the
headache.
Justin Wilson
j...@mtin.net
---
http://www.mtin.net Owner/CEO
xISP Solutions- Consulting – Data Centers - Bandwidth
http://www.midwest-ix.com COO/Chairman
Internet Exchange - Peering - Distributed Fabric
On Mar 20, 2017, at 1:11 PM, Darin Steffl
<darin.ste...@mnwifi.com> wrote:
Hello all,
We're looking to build our first DC power site for small
MicroPops and I see two options after reviewing the WISPA
archives.
The first option would be the the SDR-240-24 and DR-UPS40 with
Two 12v batteries powering a Netonix DC switch.
The second option we were looking at is just doing the AD-155A
with one 12v battery but I see the charging current is only 0.5
amps and voltage is only 13.3V which is not an optimal float
voltage.
My question is, to keep cost down, would we be OK going the
AD-155A route with the slightly lower float voltage with a 35ah
battery? We're ok with the battery taking longer to charge but
I'm just most worried if the 13.3V will wreck the battery or not.
Thanks all
--
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Minnesota WiFi
www.mnwifi.com
507-634-WiFi
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Minnesota WiFi
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507-634-WiFi
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