[kwlug-disc] UPS + separate external battery?

[Mark Steffen]

Sure.

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.

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).

Probably get an electrician to hook this up if you don't know what you're
doing.

And there you have an externalized piecemeal UPS system.  Cheap is relative
the use case I suppose.

Car batteries are designed for cranking amps (big surges) you probably
don't want to use one of those for a UPS.

*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 10:07 PM, William Park via kwlug-disc <
kwlug-disc at kwlug.org> wrote:

> Following on the "Cheap UPS" thread...
>
> I'm looking into cheap UPS.  It seems UPS discussion always turns into
> "battery" discussion.  Is there UPS that is designed to use a separate
> external battery, so that you can use any "car battery" without worrying
> about form factor?  I guess you can do that by pulling the wires out,
> but it would be better if it's by design.
> --
> William
>
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