Budman
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UPDATED JULY 17, 2023: Added in a lot more data including doing this trip in All Purpose Mode with no mounted gear and in Conserve Mode with a bed top tent. For the conditions of this testing see the full tread below. New graphs attached within this July 17 Update section. The attached photo shows my truck with the roof top tent and bike rack I have. The data shown in these graphs is for just the tent alone or bike rack alone, never both together.
Only 2 data points doing this trip with the tent so no confidence intervals for that but it is looking like it has more impact on range than the bike rack. All purpose mode with no gear likely has lower efficiency than conserve mode with a tent or bike rack. The mounted gear reduces the range/efficiency by about 15%.
UPDATED: Dec 26, 2022. Added in a data point at 0 deg F. This data point is in "Snow Mode", not conserve like the other datapoints. Roads were partially snow covered so this data point is probably a low estimate of what a trip in conserve mode would be. I've also added an extrapolation line to estimate what the range/efficiency would be below 0 Deg F.
UPDATE: Nov 18, 2022. I've added in some new data from trips in colder weather (23F is coldest so far). I also added a chart showing %-loss in range due to temperature using 70 Deg F as the baseline point. It is important to note that these efficiency number are based on a trip of 3 hours in length. If you are doing shorter trips the effect of temperature will be much stronger because the battery won't have had time to warm up and operate more efficiently. I will say I find the effect of temperature to be less than I was expecting (15% loss at 32F) and the effect of the bike rack to be larger than I was expecting.
I make a regular road trip from our home near Minneapolis, MN to our cabin near Hayward, WI. It's about 165 miles each way. I always take the same route and go about the same speed. Set cruise control at 70 mph while on I-35 and then go about 60 mph on the state highways across Wisconsin.
Always in conserve mode at "Low" ride high. I have 21" road tires. The average speed is between 50 and 55 mph each time (going through a number of small towns along the way quickly drops the average speed well below the cruising speed of 60 to 70 mph).
Sometimes I've done the trip with a hitch mounted bike rack with 1 or 2 bikes loaded. Most of the time my truck makes the trip "naked" with no mounted gear on the bed or hitch. The range/efficiency numbers are very consistent and show a clear trend with temperature and the effect of the bike rack. The bike rack cuts the efficiency by about 10%. The temperatures on the graph are a rough estimate of the average temperature during the trip.
I will continue to update this as we head into winter and colder temperatures. The shaded areas on the graphs are the 95% confidence interval on the 2nd order curve fit to the data.
Assuming a 125 kWh battery pack, the full pack range would be as shown below.
Calculating the percent change in range/efficiency from a 70 Deg baseline; The percent loss in range due to temperature is the same with and without a bike rack which makes sense.
Only 2 data points doing this trip with the tent so no confidence intervals for that but it is looking like it has more impact on range than the bike rack. All purpose mode with no gear likely has lower efficiency than conserve mode with a tent or bike rack. The mounted gear reduces the range/efficiency by about 15%.
UPDATED: Dec 26, 2022. Added in a data point at 0 deg F. This data point is in "Snow Mode", not conserve like the other datapoints. Roads were partially snow covered so this data point is probably a low estimate of what a trip in conserve mode would be. I've also added an extrapolation line to estimate what the range/efficiency would be below 0 Deg F.
UPDATE: Nov 18, 2022. I've added in some new data from trips in colder weather (23F is coldest so far). I also added a chart showing %-loss in range due to temperature using 70 Deg F as the baseline point. It is important to note that these efficiency number are based on a trip of 3 hours in length. If you are doing shorter trips the effect of temperature will be much stronger because the battery won't have had time to warm up and operate more efficiently. I will say I find the effect of temperature to be less than I was expecting (15% loss at 32F) and the effect of the bike rack to be larger than I was expecting.
I make a regular road trip from our home near Minneapolis, MN to our cabin near Hayward, WI. It's about 165 miles each way. I always take the same route and go about the same speed. Set cruise control at 70 mph while on I-35 and then go about 60 mph on the state highways across Wisconsin.
Always in conserve mode at "Low" ride high. I have 21" road tires. The average speed is between 50 and 55 mph each time (going through a number of small towns along the way quickly drops the average speed well below the cruising speed of 60 to 70 mph).
Sometimes I've done the trip with a hitch mounted bike rack with 1 or 2 bikes loaded. Most of the time my truck makes the trip "naked" with no mounted gear on the bed or hitch. The range/efficiency numbers are very consistent and show a clear trend with temperature and the effect of the bike rack. The bike rack cuts the efficiency by about 10%. The temperatures on the graph are a rough estimate of the average temperature during the trip.
I will continue to update this as we head into winter and colder temperatures. The shaded areas on the graphs are the 95% confidence interval on the 2nd order curve fit to the data.
Assuming a 125 kWh battery pack, the full pack range would be as shown below.
Calculating the percent change in range/efficiency from a 70 Deg baseline; The percent loss in range due to temperature is the same with and without a bike rack which makes sense.
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