Devices connected to the UPS (model CDP G-UPR 750Va):
1) Motorola SB5100 cable modem
2) Motorola SB5101 cable modem
3) Linksys WRT320N router
4) Linksys WRT54G2 router w/dd-wrt firmware *)
5) Linksys RV042 router
6) TP-Link TL-SF1005D switch
7) Linksys PAP2T ATA
8) Panasonic KX-TG4012 wireless phone; base station and 2 handsets
*) In order to not have issues with DNS I unticked 'Use DNSMasq for DNS' and 'Use DNSMasq for DHCP', and disable 'DNSMasq'.
The devices are plugged into two surge protectors connected to 2 outlets on the UPS.
Test this morning (no phone calls made during test):
7:01 - Mains cut
7:30 - Audible/visual warning on the UPS (fast movement on beep signal and indicator light)
7:32 - Devices shut-down
So, about 30 mins uptime on the UPS, which is adequate. I have had one or two power failures for more than 30 minutes over the last 7-8 years. As indicated earlier, I am experiencing outages from a few seconds to 5-15 mins relatively frequent. I believe this UPS will do the job. Thinking of getting an APC 1500/2000Va as a second UPS and connect one Windows machine and 2 LED screens.