[kwlug-disc] UPS + separate external battery?

[Andrew Kohlsmith (mailing lists account)]

This was rather timely… eevblog forums showing some projects where people repurpose APC UPSes for keeping higher loads functioning. Interesting stuff.

http://www.eevblog.com/forum/projects/cool-tutorial-converting-an-apc-ups-into-a-powerful-sinewave-inverter <http://www.eevblog.com/forum/projects/cool-tutorial-converting-an-apc-ups-into-a-powerful-sinewave-inverter>

-A.

> On Apr 2, 2017, at 10:48 PM, Mark Steffen <rmarksteffen at gmail.com> wrote:
> 
> But what if you need to do some kind of maintenance on your battery system?  Commercial UPS systems have a bypass so that can happen.  Pretty sure Tripplite and APC make ghetto transfer switches that might work in this case.  Just not sure how you would keep the synchronous inverter in the battery system in sync with the mains or if the transfer switch sorta smooths that over enough that your gear won't freak out from a disruption in the 60 hertz sine wave during a transfer.
> 
> Mark Steffen
> Office Direct: +1.226.476.1240 | Mobile/WhatsApp: +1.226.600.0464
> "Don't believe everything you read on the Internet." -Abraham Lincoln
> 
> 
> 
> On Sun, Apr 2, 2017 at 10:37 PM, Andrew Kohlsmith (mailing lists account) <aklists at mixdown.ca <mailto:aklists at mixdown.ca>> wrote:
> > On Apr 2, 2017, at 10:27 PM, Mark Steffen <rmarksteffen at gmail.com <mailto:rmarksteffen at gmail.com>> wrote:
> > Buy a good quality battery charger/charge controller.
> >
> > Buy a bank of deep cycle batteries or used electric forklift batteries (cheap and still have lots of life left in them), arrange them in a way that creates an array with the appropriate voltage for your charge controller and connect it to the controller.
> >
> > Buy a synchronous inverter, connect it to the battery bank.
> >
> > Make sure the inverter, and the battery bank can deliver the kind of peak wattage you will need.
> 
> Skip the transfer switch and just run everything off batteries all he time; these things are called on-line UPSes and as long as the charger is capable of supplying the current to keep the batteries charged along with your load, you’re good to go.
> 
> -A.
> 
> 
> 
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