Yeah, I wouldn't do that. No charge current limiting means the batteries
will likely pull down the supply and starve the load. Also pay attention
to the initial current spec on the batteries. Smaller ~9-20Ah batteries
call for 2A or so. The Mean Well DR-UPS40 is capable of 40A @ 27VDC and
limits the charging current to 2 or 2.5A I believe. It's a decent cheap
option.
There's also the Mean Well DRC-100 A (12VDC) or B (24VDC). I wish they
made a 48V version. 100W and 1.25A of charging current which is roughly
2X the AD-155B. But the 155B gets you a little more power at 150W. I
might start using the DRC-100B for new stuff since it's smaller and
natively DIN rail mountable unlike the AD-155.
If you want fancy stuff like alarm contacts and temperature
compensation, the Traco BCMU360 at about $170 + a Mean Well SDR240-24 or
-48 isn't all that expensive. The BCMU is jumper selectable between 24
and 48VDC which is nice. Regulated output. Some folks don't like that it
does the internal DC-DC conversion. Yes, it takes a 12VDC battery and
converts to the selected output. I have up to 40AH on a few. The
charging current is limited to 1A.
If you want big boy stuff, buy a rectifier shelf for 500W, 1kW, 2kW,
whatever, and 100+ Ah of batteries. You can get ICT's new 1U shelf in
+12, +24, +48 and -48.
On 3/20/2017 12:24 PM, Adam Moffett wrote:
Qualifying info: If you don't want/need any features like temperature
compensation or low voltage disconnect, then all you need is a power
supply that can be adjusted to your float voltage, then you wire the
batteries and load in parallel.
------ Original Message ------
From: "Chuck McCown" <[email protected] <mailto:[email protected]>>
To: [email protected] <mailto:[email protected]>
Sent: 3/20/2017 1:20:49 PM
Subject: Re: [AFMUG] DC Power Site
You don’t need two power supplies. Just pick the power supply that
has enough current to both power the radios and supply a healthy
recharge current right after a power outage to the radios.
*From:* Darin Steffl
*Sent:* Monday, March 20, 2017 11:11 AM
*To:* [email protected] ; [email protected]
*Subject:* [AFMUG] DC Power Site
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
--
Darin Steffl
Minnesota WiFi
www.mnwifi.com <http://www.mnwifi.com/>
507-634-WiFi
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