Here's a good LINK to determine the estimated time you'll get from your backup system. You enter the amp-hours of the batteries, planned depth of discharge, operating temperature and the wattage you'll be drawing and it tells you how many hours you'll have power. If I run the return pumps I'll get 4.9 hours. If instead I run 2 Tunze in my big tank at the fluctuating 30-100% and the return pump in the other tank I'll have 7.5 hours.
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225g reef 3x250w MH 8x39w T5 Sfiligoi/ACLS, Deltec AP851, Deltec PF601S, Deltec KM500, Ozotech Poseidon, Aquatronica, Tunze TS48, Tunze Nanostream 6025s, Aqua UV 114w, MTC Ozone reactor, Cole Parmer peristaltic pump
67g reef, Euro-Reef RS135, 60g refugium, Mag 9 return, Tunze Nanostream 6025s, 4x39w T5
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