Tag Archives: Hvac

About that climate hit….

So what do you think this post will be about?? Winter weather driving?? LOL Well sort of.

Ever notice that as soon as you turn on the heater the guess-o-meter’s value suddenly drops by 10 – 20 miles and your status goes <0? (If your status read 0 beforehand the value of the status will be the amount that your range dropped.) Have you wondered where the guess-o-meter gets the value that it will use to drop the range with? Keep reading…

During the week I use the FFE as my commuter car for my 30 mile round trip into work and back. On the weekends we typically use it for short trips to the store, or to my son’s activities, etc.–just driving short distances around town. This means that during the week I have to make sure the FFE can go the 30 miles so I can get home, but on the weekends it really doesn’t matter because it typically only drives 10 or 15 miles a day–if that. In warmer weather the 30 miles is no problem (usually only using about 20% of the battery for those 30 miles). This winter with the really cold temps, though, I’ve had to use all the tricks to (most of them spelled out in a blog entry or two here) ensure I have the 30 miles. Where are you going with this you’re thinking to yourself?

Here is the thing: During the week I’ll attempt to use as little power from the HVAC as possible (defrost on LO and fan on low) but on the weekend since it doesn’t matter we’ll use max defrost, set the temp high, etc. What I’ve found out is that the guess-o-meter also guesses at the power consumption for the HVAC! On Monday morning when I get in the car and hit the HVAC button to turn it on my range will drop by 20 miles (because over the weekend we’ve used max power on the HVAC) but on Saturday morning when I hit the HVAC button to turn it on my range will ¬†only drop by 1 or 2 miles–if that (because during the week the HVAC has used very little power). Thus the guess-o-meter is also making an educated guess about how much power the HVAC will use based on your prior usage of it.

That’s actually pretty cool: instead of just using some fixed guess that may be too high at one point or too low it is actually using measured historical usage.