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No I think you hit the nail on it's head<a href=showthread.php?s=&postid=8957032#post8957032 target=_blank>Originally posted</a> by BeanAnimal
765W @ 7 hours = 5.35 kWh per day
200W @ 12 hours = 2.4 kWh per day
Total 7.75 kWh per day being replaced by 4.5 kWh per day (assuming 10 hours full on for the SPS, and ignoring the lower wattage for the other 2 hours).
So the net savings is 3.25 kWh per day @ .14 cents = $0.455 a day in savings or, $13.65 a month.
I honestly do not think the single SOLARIS will have enough output, even at 10 hours of full brightness. I could be very wrong.
With regards to the AC. Because you DO NOT run a chiller, the HEAT difference between the current setup and the new setup will be 3.25kWh worth of "heat" that the AC will have to account for. Your house is not a perfect insulator and a good portion of that heat will escape on it's own. But to be fair lets say it takes 1.5 Watts of AC to remove 1 Watt of heat. So in the summer time you in theory could save 4.875 kWh a day + the initial 3.25 watts. That is a total 8.125 kWh a day or a TOTAL MAX SAVINGS OF $34 a month worst case during the days that the AC runs.
Again real world it will be much less than that. But lets just say $34 for 4 months and 13.65 for 8 months would average out to around $20 a month BEST CASE SAVINGS. Real world, your looking at $14-$16.
Not bad if you can get enough light. If you feel like going further we can calculate all of the costs. What you PAID for all of the current stuff and how much you think you can sell it for.
I was also calculating about $20 a month that is not bad at all considering i don't need to buy any bulbs for five years that will add up alat more than $20 a month savings for me.
MY light hood is 7 years old but the IC ballast are new .
Hey thanks for all the information about Electrical savings .
I may just go with a mix reef in the future and get the LEDs just because the heat in the summer makes my A/C work so hard the house is small and you can feel the heat from the MH in the living room where i have my tank.
I'm going to get a new tank soon so i was looking for new lighting for it .