i recently just bought the battery backup for the vortech pumps. it powers 1 vortech pump at half power for 30 + hours and will run 2 vortech at half power for 15 hours. it costs $200. you also have the ability to connect two of these batteries together and double the run time. the pumps are $400 but if you do some research you maybe be able to mod the cable to run tunzes or other powerheads. ecotech will also replace the batteries at the end of life cylce for about $65. life cycle is 5 - 7 years depending on usage. the battery is always plugged into the wall to be trickle charged and automatically kicks in when senses power outages and the vortech pump recognizes the new power signal and reduces its power to half to conserve power. just an idea.
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