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

[Alex Carver]

On 7/8/2013 22:42, gcs8 wrote:
> new option right at 600 watts
> http://www.frys.com/product/6173999?site=sr:SEARCH:MAIN_RSLT_PG
>
> e bay option ~1KW
> http://www.ebay.com/itm/APC-UPS-XS-1500-Battery-Backup-Power-Supply-BX1500-Tested-FREE-SHIP-/141012115796?pt=US_Uninterruptible_Power_Supplies&hash=item20d4fa2154
>
>
> shop around a little, my suggestion is do math on finding units with no
> battery and where you can get the batterys local for a good price, I use a
> 3000kva APC that sits in my rack at the house, I have been thinking about
> building a bigger battery pack for it but it does its job.


One word of caution with this is to make sure the UPS has some type of 
active cooling especially for smaller units that weren't originally 
designed for large battery packs.  Part of the operating thermal budget 
on some of the less expensive, passively cooled systems involved 
assuming the battery pack is a fixed capacity which would run down in a 
short period of high load.  The temperatures would climb inside the 
inverter but the battery dies before the inverter gets too hot.  With a 
bigger battery pack shoehorned in, you reach an overtemperature 
condition long before the pack dies.  The inverter dies instead.  A UPS 
with active cooling can handle the bigger pack.