<div dir="ltr">Sure.<div><br></div><div>Buy a good quality battery charger/charge controller.</div><div><br></div><div>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.</div><div><br></div><div>Buy a synchronous inverter, connect it to the battery bank.</div><div><br></div><div>Make sure the inverter, and the battery bank can deliver the kind of peak wattage you will need.</div><div><br></div><div>Buy a good quality automatic transfer switch so you can bypass the battery system (be on mains by default, switch to your battery if the mains fails).</div><div><br></div><div>Probably get an electrician to hook this up if you don't know what you're doing.</div><div><br></div><div>And there you have an externalized piecemeal UPS system. Cheap is relative the use case I suppose.</div><div><br></div><div>Car batteries are designed for cranking amps (big surges) you probably don't want to use one of those for a UPS.</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><b>Mark Steffen</b><div><font size="1">Office Direct: +1.226.476.1240 | Mobile/WhatsApp: +1.226.600.0464</font></div><div><i style="font-size:x-small">"Don't believe everything you read on the Internet." -Abraham Lincoln</i></div><div><br><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Sun, Apr 2, 2017 at 10:07 PM, William Park via kwlug-disc <span dir="ltr"><<a href="mailto:kwlug-disc@kwlug.org" target="_blank">kwlug-disc@kwlug.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Following on the "Cheap UPS" thread...<br>
<br>
I'm looking into cheap UPS. It seems UPS discussion always turns into<br>
"battery" discussion. Is there UPS that is designed to use a separate<br>
external battery, so that you can use any "car battery" without worrying<br>
about form factor? I guess you can do that by pulling the wires out,<br>
but it would be better if it's by design.<br>
<span class="HOEnZb"><font color="#888888">--<br>
William<br>
<br>
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