Re: Redundant Power Supply or battery backup for net6501

Chris Boot <[email protected]> writes:

> On 01/08/2014 17:54, Andreas Steinel wrote:
>> On Fri, Aug 1, 2014 at 12:49 PM, Greg Troxel <[email protected]> wrote:
>>> I have a net5501, and measured that with a 2.5" disk (not ssd) it draws
>>> about 500 mA at 12V.  I have it connected to several sealed lead-acid
>>> batteries in parallel, typically a 12Ah and two 7Ah.  These batteries
>>> are on float charge to keep them at 13.5V when there is AC power from
>>> the utility.  When the utility power fails, the net5501 continues to
>>> run, and should last for many hours.
>> 
>> Thank you for sharing your solution. How is the (complete) schematic
>> for your setup (I saw the fuses and bypass capacitor missing schematic
>> of phk which uses a similar setup as yours)? Is there also a charge
>> protecting circuit involved or is the battery charging restricted
>> (e.g. delta-V)?
>
> Personally, I use Mini-Box OpenUPS devices:
>
> http://www.mini-box.com/OpenUPS
> http://www.mini-box.com/OpenUPS2
>
> They have proper charge controllers on board for all kinds of battery
> chemistries, and work really nicely.

What I do is to provide 12V via the 5.5x2.1 barrel connector to the
net5501 in a case, just as if the wire were coming from a wall wart.

Each battery has a fuse in the positive lead, and then Anderson
Powerpole connectors, and is plugged into a West Mountain Radio
RigRunner.   I then have a 12V wall wart (that produces more) via a
cheap solar charge controller hooked up to the RigRunner as well.

This sounds a little kludgy, and it sort of is, but I'm coming at this
from having parts for ham radio emergency use of 12V batteries and a
very small off-grid solar system, so it works for me.

Compared to all of this, if you don't already have it and aren't already
familiar, the OpenUPS looks really nice.  And, it seems to have
low-voltage shutdown, monitoring, etc.  Plus, you can set the output for
6V so that you lose less in the regulator.

The picoUPS looks interesting too, but needs to be a in 12V world, it seems.

Putting this inside the rackmount case may or may not work.  Where my
net5501 is I have enough other space that I haven't had to worry about
this.

You can also just plug the 12V power supply into a regular 120VAC UPS
(or rather your local normal line voltage).