From cbe8d1f9633060169526ee2f8d49689097a0687d Mon Sep 17 00:00:00 2001 From: Matt Popovich Date: Wed, 22 Nov 2023 14:14:38 -0700 Subject: [PATCH] Small additional info --- ...2022-11-06-why-the-epas-ev-efficiency-numbers-dont-add-up.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/_posts/2022-11-06-why-the-epas-ev-efficiency-numbers-dont-add-up.md b/_posts/2022-11-06-why-the-epas-ev-efficiency-numbers-dont-add-up.md index 5076bdb..6151c52 100644 --- a/_posts/2022-11-06-why-the-epas-ev-efficiency-numbers-dont-add-up.md +++ b/_posts/2022-11-06-why-the-epas-ev-efficiency-numbers-dont-add-up.md @@ -45,7 +45,7 @@ So let’s double check how big the battery is to confirm these numbers make sen The EPA publishes the documentation sent in by the automakers for a “certificate of conformity”. Basically it’s a document where the automaker says “Hey, here’s some numbers on our engine, it meets EPA requirements”. This [document for the 2020 Model 3 LR AWD](https://dis.epa.gov/otaqpub/display_file.jsp?docid=48712&flag=1#page=020) says the battery has a weight of 480kg and it has a density of 150Wh/kg. This amounts to a 480kg * 150Wh/kg = 72kWh battery, although most other websites that I’ve looked at give closer to 75kWh: [75kWh](https://en.wikipedia.org/wiki/Tesla_Model_3#Specifications_table) [75kWh](https://www.evspecifications.com/en/model/0a86df) [73.5kWh](https://ev-database.org/car/1138/Tesla-Model-3-Long-Range-Dual-Motor) [75kWh](https://www.guideautoweb.com/en/makes/tesla/model-3/2020/specifications/long-range-awd/). I haven’t quite nailed down why there is this discrepancy between Tesla’s documentation and what most other websites give. I want to chalk it up to “manufacturing tolerances and differences” but I haven’t been able to confirm that. Regardless, just when I thought I had the battery capacity figured out, I stumble upon a site that listed both capacity and “usable capacity”... Yep, this rabbit hole goes deeper. -The site was evspecifications.com, and they list a “usable capacity” around 75kWh with a total capacity of 79.5kWh (screenshot below). What’s the difference? +The site was [evspecifications.com](https://www.evspecifications.com/en/comparison/7cbc182a), and they (used to) list a “usable capacity” around 75kWh with a total capacity of 79.5kWh (screenshot below). What’s the difference? [![Tesla Model 3 Long Range All-Wheel Drive Battery Capacity](/assets/img/posts/2022-11-06-why-the-epas-ev-efficiency-numbers-dont-add-up/TeslaModel3-LR-AWD_batteryCapacity.png)]( https://www.evspecifications.com/en/comparison/7cbc182a) *Tesla Model 3 Long Range All-Wheel Drive Total Battery Capacity vs Usable Capacity*