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You are undersized for the current draw. Check with APC for the verification on the 1000VA unit for the equipment you are using.
I would recommend:
Sorry, there was a problem. Please try again later.Thank you for your interest in our products. Yes the 1,000VA UPS will support more equipment to it. You would just want to make sure to keep the load under 600 watts. I would just double check what the fax machine doesn't pull that much power.
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