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I have been using sendon 1000va ups with 2 x 12 volt 7aH batteries. I replaced two 12 volt (17 plate) 160 aH lead acid batteries for long backup for 1 Fan and 40 watt 2 energy saving light. Backup time only 7 minutes! And switch goes off, and need again switch on for another 7 minutes.
What...
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