There comes a point in time when it’s a good idea to invest in a backup power supply and that time was about 5 years ago. If you haven’t gotten yourself a battery backup solution coupled with a generator for added secuirty then you might want to seriously consider it. Say hello to the Zeus battery backup using Sine -Wave technology, this unit while mainly available in Italy is specially designed to tackle aquariums and is the only unit to date that does so. Don’t think that this unit actually comes with the batteries, it doesn’t. It is more of a controller of the available battieres it has access to.You supply the batteries and it works similiar to an inverter, but in a much larger scale. It can guarantee an actual amount of wattage of 400 watts. it will take batteries in the 24 volt variety and you can pick this up for around 199 euros or due to the recent drop in the euro to dollar conversion rate, $253.