<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">This was rather timely… eevblog forums showing some projects where people repurpose APC UPSes for keeping higher loads functioning. Interesting stuff.<div class=""><br class=""></div><div class=""><a href="http://www.eevblog.com/forum/projects/cool-tutorial-converting-an-apc-ups-into-a-powerful-sinewave-inverter" class="">http://www.eevblog.com/forum/projects/cool-tutorial-converting-an-apc-ups-into-a-powerful-sinewave-inverter</a></div><div class=""><br class=""></div><div class="">-A.</div><div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class="">On Apr 2, 2017, at 10:48 PM, Mark Steffen <<a href="mailto:rmarksteffen@gmail.com" class="">rmarksteffen@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">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.</div><div class="gmail_extra"><br clear="all" class=""><div class=""><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><b class="">Mark Steffen</b><div class=""><font size="1" class="">Office Direct: +1.226.476.1240 | Mobile/WhatsApp: +1.226.600.0464</font></div><div class=""><i style="font-size:x-small" class="">"Don't believe everything you read on the Internet." -Abraham Lincoln</i></div><div class=""><br class=""><br class=""></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br class=""><div class="gmail_quote">On Sun, Apr 2, 2017 at 10:37 PM, Andrew Kohlsmith (mailing lists account) <span dir="ltr" class=""><<a href="mailto:aklists@mixdown.ca" target="_blank" class="">aklists@mixdown.ca</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">> On Apr 2, 2017, at 10:27 PM, Mark Steffen <<a href="mailto:rmarksteffen@gmail.com" class="">rmarksteffen@gmail.com</a>> wrote:<br class="">
> Buy a good quality battery charger/charge controller.<br class="">
><br class="">
> 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.<br class="">
><br class="">
> Buy a synchronous inverter, connect it to the battery bank.<br class="">
><br class="">
> Make sure the inverter, and the battery bank can deliver the kind of peak wattage you will need.<br class="">
<br class="">
</span>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.<br class="">
<span class="HOEnZb"><font color="#888888" class=""><br class="">
-A.<br class="">
</font></span><div class="HOEnZb"><div class="h5"><br class="">
<br class="">
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