After owning our LEAF for 1.5 months, I understand why they call the range meter the Guess-o-meter. I would prefer to estimate my remaining range based on my typical efficiency of 3.9 miles / kWh (instead of the very recent efficiency that the GOM uses).
However, the one crucial number I need, the energy remaining in the battery, isn't available without LEAFSpy. The display shows SOC, but the energy remaining will also depend on the SOD (state of degradation).
If I want to use my system, I can either run LEAFSpy all the time or create a spreadsheet and print it out. Here's the formula I'd use.
Energy Remaining = SOC% / 100% * kWh / Full Charge
Miles Remaining = Energy Remaining * Miles/kWh - Margin (Where Margin= Margin of safety (# miles remaining when I get home))
or
Miles Remaining = SOC% / 100% * kWh/Full Charge * Miles/kWh – Margin
Here's a spreadsheet that uses that formula:
Ignore the "Multiplier" column.
If I use a Margin of 0 miles, this is the spreadsheet:
So, to have an improved GOM in my head, I simply multiply the SOC by .9 and subtract the margin. For example, if SOC is 80% my remaining range is about 80 * .9 - 8 = 65 miles. Or, I could print out the spreadsheet and keep it in the car.
I'd have to recalculate as the battery degrades.
Is my reasoning and math correct?
However, the one crucial number I need, the energy remaining in the battery, isn't available without LEAFSpy. The display shows SOC, but the energy remaining will also depend on the SOD (state of degradation).
If I want to use my system, I can either run LEAFSpy all the time or create a spreadsheet and print it out. Here's the formula I'd use.
Energy Remaining = SOC% / 100% * kWh / Full Charge
Miles Remaining = Energy Remaining * Miles/kWh - Margin (Where Margin= Margin of safety (# miles remaining when I get home))
or
Miles Remaining = SOC% / 100% * kWh/Full Charge * Miles/kWh – Margin
Here's a spreadsheet that uses that formula:
Ignore the "Multiplier" column.
If I use a Margin of 0 miles, this is the spreadsheet:
So, to have an improved GOM in my head, I simply multiply the SOC by .9 and subtract the margin. For example, if SOC is 80% my remaining range is about 80 * .9 - 8 = 65 miles. Or, I could print out the spreadsheet and keep it in the car.
I'd have to recalculate as the battery degrades.
Is my reasoning and math correct?