[ale] OT need 600-1000W power protection for 3 minutes - cheap

Ron Frazier (ALE) atllinuxenthinfo at techstarship.com
Tue Jul 9 21:06:32 EDT 2013



Alex Carver <agcarver+ale at acarver.net> wrote:

>On 7/9/2013 13:13, Ron Frazier (ALE) wrote:
>> PS, these ups's only have about 300 joules of surge protection.  I've
>> never understood why.  I would recommend putting a good media room
>surge
>> protector first in line, with a 2000 - 3000 joule surge protection
>> rating, then the ups.
>
>Because when the voltage exceeds the setpoint it disconnects the load 
>from the incoming power and switches to battery.  The low surge 
>suppression is to handle surges that stay within the switching limits.
>
>

I understand what you're saying, but I'm not totally convinced that's enough.  I doubt a 500V 20us transient would trigger a switch over.  Even if it did, it takes 10 mS for the switch.  The transient probably will have already gone through.  But, it could still harm the pc.  The response time of a varister in a surge protector is in nanoseconds so it will trap it.  But, these are cumulative over time and destroy the surge protector.  Since GA has the 2nd highest incidence of lightning in the country, I still like the idea of a big 3000 joule surge  protector sitting there.

Sincerely,

Ron


--

Sent from my Android Acer A500 tablet with bluetooth keyboard and K-9 Mail.
Please excuse my potential brevity if I'm typing on the touch screen.

(PS - If you email me and don't get a quick response, you might want to
call on the phone.  I get about 300 emails per day from alternate energy
mailing lists and such.  I don't always see new email messages very quickly.)

Ron Frazier
770-205-9422 (O)   Leave a message.
linuxdude AT techstarship.com
Litecoin: LZzAJu9rZEWzALxDhAHnWLRvybVAVgwTh3
Bitcoin: 15s3aLVsxm8EuQvT8gUDw3RWqvuY9hPGUU




More information about the Ale mailing list