# UPS HOWTO

### Eric Steven Raymond

Thyrsus Enterprises

### Nick Christenson

Revision History
Revision 2.2 | 2007-05-22 | Revised by: esr
Minor update with more info about battery types.
Revision 2.1 | 2005-09-28 | Revised by: esr
Link fixes.
Revision 2.0 | 2005-08-15 | Revised by: esr
Merged in material by Nick Christenson.
Revision 1.3 | 2005-08-17 | Revised by: esr
Fix a bad link.
Revision 1.2 | 2004-10-28 | Revised by: esr
Remove a bad link.
Revision 1.1 | 2004-02-21 | Revised by: esr
Add a little deployment advice, and stuff on other technologies.
Revision 1.0 | 2003-10-07 | Revised by: esr
Initial release.

An Uninterruptible Power Supply (UPS) is an important thing to have if you live in an area where power outages are at all common, especially if you run a mail/DNS/Web server that must be up 24/7. This HOWTO will teach you things you need to know to select a UPS intelligently and make it work with your open-source operating system.

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