Been awhile since I updated, not much progress lately. Getting ready to jump back on the canopy and get that wrapped up.
In the mean time I've been thinking about how much my tank actually costs in utilities since it's now running (minus lighting). I had put together a power consumption calculator once upon a time, however due to the PG&E tiered system it was never really accurate. After thinking about it some more it donned on me that the more energy we use in our house (for non-reef related stuff) the more the tank costs to run each month... an analysis was in order!
PG&E has various
rate schedules, most of us are probably on an E-1. There are 5 tiers which includes the "baseline". In SJ County we are alloted 12.7 kilo-watt-hours (kwh) per day during the winter. Here are the tiers and their respective costs per kwh:
1) Baseline $.115
2) 101-130% $.131
3) 131-200% $.247
4) 201-300% $.305
5) 301% and above $.348
My tank is fairly energy friendly when compared to other tanks of its size; however it is still a big tank and will account for about 40% of our energy usage, or about 15.8 kwh per day... my tank alone exceeds my baseline allowance - ouch! In order to find out how much it actually costs I put together a new power consumption calculator that takes into consideration the tiered plans. First I plugged in our household power usage based on our last bill, 23.5 kwh per day spread across the tiers like so...
1) 12.7
2) 3.8
3) 7
next I plugged in the tank power usage, 15.8 kwh per day.
1) 12.7
2) 3.8
3) 8.9
4) 12.7
5) 1.2
Before I never broke out of the 200% bracket, with the tank figured in I'm hitting the 300%+ bracket. At these rates the tank costs $4.76 a day to run (electricity only). By lowering the household usage I can also lower the cost to run the tank, for example 15% reduction in household usage leads to a 5.5% reduction in cost to run the tank, $4.50 per day. It's not a huge difference, but it does add up. The total savings based on a 15% reduction in energy use is about $500 a year, that's $1500 back in my pocket in 3 years... nothing to complain about there. We're going to be looking for ways to cut back around the house and see what we can do.
If anyone is interested I'm going to post the calculator on my blog soon.
Footnote: If you use the most electricity in the evening or at night you may want to look into the E-6 and/or E-7 rate schedules which are based on time of use and have peak and off-peak rates. Running your tank at night also has quite a few merits when it comes to saving energy.