I have not used Su-Kam myself but it seems to be a good brand. The length of backup time depends on battery capacity and the load rather than on the inverter. What kind of load are you thinking of using?
their sine-i series are gud.
ive been using a 1.4KV model for last 4.5 yrs. no problems till now.
thinkin of adding 2 more tubular 120/180AH batteries in parallel to current ones.
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