Hmm I was assuming worst case scenario if someday my rack is filled with 60 drivesFull and Full are different things ... you know physical size might not be related to (peak) power draw.
You should try to get a rough feeling for what you use everyday vs peak vs minimum config for blackout times.
I upgraded recently since I was not happy with runtime and now have a SMX1500 + extension and a secondary SMX2200 (I got relatively cheap), but have not properly distributed things yet.
The 1500x (with extension) claims 1:30 runtime at current 50% utilization.
Depending on your draw it might take quite a bit to cover 3hrs ... maybe consider an optional blackout plan (running most important services on less boxes)
, although it seems unlikely cause the older ones always fail first before i put a newer drive..
Thanks though, i think i'm gonna try SURT6000XLI with one or 2 backup extension modules.
there's a seller offering a used unit cheap here..
Although this multiple (48) batteries system kinda concern me,
i heard that if one battery fail, that module will stop working,
i thought it would work like redundant psu