"Sandbag" wrote in message oups.com...
"Adding an extra battery pack DOES NOT increase maximum current
the inverter or UPS can deliver. This current limit is based on the
inverter internal design and electronic parts (transistors, fuses) used
to build it...
Adding extra battery pack will increase TIME the inverter will work
from the battery with the same load, but will not increase the
maximum load."

I am sorry if my words were mis-spoken and should have been in Watts
not VA,( =0 sorry i respond to this stuff early in the morning).

No, it does not really matter here - adding extra battery pack does not
increase the UPS maximum load power limits. It does increase "runtime"
(battery discharge time), which is not the same but you seem to mix them two.

I will not protect my valuable investment with a 150$ UPS.

For that kind of price you can build a backup power source yourself
using large "marine" deep cycle acid battery, AC inverter and a power relay
(the 3PDT kind with a coil designed to work with 120V/AC voltage).
And your "investment", how you call it in a funny way, will be properly
protected from power outages lasting many, many hours...

Everybody will do whatever he/she prefers to do
and what makes sense in his/her local situation...
Properly designed backup power source does not have to
cost a fortune - that is the main thing I am trying to say.