Lifestyle
EKM Digital Submeter Measures EV Charging Efficiency
Electric vehicle owners may now know that 10-12% of drawn electricity is lost during the charging process when AC is converted to DC.
The “Since Last Charge” indicator on the Tesla Model S driver’s console keeps count of distance, energy used and average energy used per mile since the last time you unplugged, but matching this energy consumption to what you’re being billed by your company is more difficult than one might think.
Taking the 10.6kWh Total Energy readout from the dash and multiplying it by my billable electricity rate of $0.1670/kWh, I would think that it costs me $1.77 to drive 35.3 miles. However the actual costs are slightly higher because of the power conversion losses when charging. Charging via a standard 110V wall plug in the US is reported to be much less efficient than a NEMA 14-50 hence you’ll be using even more energy to reach the same state of charge.
Tesla’s charging calculator appears to take into account some of these charging loses. According to the calculator, 35 miles of range added to the Model S requires 11.6kWh of energy although I was able to achieve that with through 10.6 kWh as seen through my dash readout. This could imply a 91% charge efficiency but of course this is a very loose calculation and based on many assumptions such as the speed in which you drive, elevation changes and weather. It’s not simple to calculate how much actual energy you’re using to charge your Tesla Model S.
The EKM Digital Submeter
The solution I found was to put a submeter between the EV charge outlet and main power supply. There are many types of meters on the market from basic kWh counters to advanced meters that can broadcast actual use over a wifi network, plot graphs, etc. After doing some extensive research, I decided to go with a metering solution from EKM Metering. My electrician did some independent research and came up with the same brand so I felt pretty good about my choice. I ended up purchasing the 100A kWh EKM digital submeter and enclosure.
My electrician was able to complete the installation in 3 hours with a portion of the time spent on retrofitting the EKM enclosure to accommodate for the larger 240v conduit. Total cost spent for products, labor and materials was $292.
How Does it Work?
The EKM submeter is like an odometer but with an energy readout that continuously increments as power is being drawn. There is no reset button. A blinking red light indicates that 1.25Wh is drawn per single blink of the LED.
Measuring actual energy consumed over a specific time period requires taking some notes. Here are the the measurements and results of my tests:
My results indicate that there’s approximately a 85% charging efficiency for my Tesla Model S which is less than the 91% efficiency that Tesla Motors seems to be using in their online calculator.
I’ll be performing several more tests over a longer period of time. I want to look at power draw differences while the Model S is asleep and also analyze variations in energy consumption due to software updates.
Conclusion
Overall the EKM Digital Submeter is a nice addition to any EV charging setup if you’re looking for a true picture of how much energy usage is going into your Tesla Model S / electrical vehicle. Assuming a $0.167/kWh electricity cost and 325 Wh/mile, the cost of the meter plus installation would require 5,380 miles of EV driving to break even.
If you’re looking for a cheaper alternative, simply add 15% to the energy usage readout on your EV to approximate the true energy cost per EV mile driven. Drive clean and drive smart!
Lifestyle
NTSB findings on fatal Tesla crash tell a very different story
The NTSB confirmed the driver, not Tesla’s FSD, caused the fatal Texas house crash.
The National Transportation Safety Board released preliminary findings Wednesday confirming that a Tesla driver, not the vehicle’s software, caused a fatal crash in Katy, Texas in June. The driver, 44-year-old Michael Butler, had engaged Full Self-Driving Supervised mode on Rose Hollow Lane, a residential street with a 30 mph speed limit, before manually overriding the system by pressing the accelerator pedal all the way to 100%. Data recovered from the 2025 Tesla Model 3 showed the vehicle was traveling over 70 miles per hour when it struck a home and killed 76-year-old Martha Avila, who was inside. Weather was clear, the road was dry, and it was daylight.
Texas man charged in fatal Tesla crash where he blamed Autopilot
Butler told authorities he had passed out at the wheel. But security camera footage obtained by the NTSB told a different story, and showed the car accelerating through an intersection before leaving the road entirely. Police also found that Butler’s phone had Google searches including the terms “Tesla FSD not aggressive enough 2026” and “Tesla FSD too timid,” raising serious questions about how he was using the system before the crash. Butler has since been charged with manslaughter. The victim’s family has filed a lawsuit against both Butler and Tesla, alleging negligence.
The NTSB findings aligned directly with what Tesla VP of AI Software Ashok Elluswamy had already stated publicly on X in the weeks after the crash, writing that “the driver manually overrode self-driving by pressing the accelerator all the way to 100%.” The data confirmed his account.
Yup. In this case, the driver manually overrode self-driving by pressing the accelerator all the way to 100% of the accel pedal in this residential area. They reached a speed of 73 mph during the crash, and had the accelerator pressed even after the crash.
— Ashok Elluswamy (@aelluswamy) June 22, 2026
Elon Musk
Elon Musk’s Texas ranch to showcase the lifelong work that changed the world
Elon Musk is building a product gallery at his Texas ranch spanning his lifelong inventions.
Elon Musk took to X earlier today, noting “Am putting together a product gallery at my ranch in Texas.” in response to a resurfaced famous quote from JPMorgan CEO Jamie Dimon’s wherein he draw parallels of the Tesla CEO to legendary physicist Albert Einstein.
Dimon made the remark at the World Economic Forum in Davos, Switzerland back in January 2025, telling CNBC at the time, “SpaceX, Tesla, Neuralink, I mean, the guy is our Einstein.” The remark seemingly ended a long-time feud between the two high profile execs.
While details are thin about the exact location of Elon Musk’s Texas ranch and any pending projects that would serve as a gallery and homage to his portfolio of revolutionary product inventions spanning from 1984 to 2025, land acquisition records point to roughly a location of several thousand acres in Bastrop County, east of Austin near the Colorado River and held through an LLC called Horse Ranch LLC that’s managed by Musk’s longtime personal friend and family wealth manager Jared Birchall. Birchall also serves as the CEO of Neuralink.
Tesla’s “ecological paradise” in Giga Texas may be larger than expected
The broader Bastrop County footprint surrounding the ranch has grown significantly. Entities tied to Musk have accumulated approximately 2,000 acres in Bastrop County as of mid-2026, up from 700 acres earlier in the year, with possibly as much as 6,000 acres acquired in total across Bastrop and Travis counties based on deed records.
No completion date for the gallery has been announced and Musk has not confirmed whether it will be open to the public. As Teslarati has reported, SpaceX just completed the largest IPO in history raising $75 billion, a milestone that makes this particular moment in Musk’s career a natural inflection point for looking back at what he has built through the years.
Am putting together a product gallery at my ranch in Texas https://t.co/xQf5FRy4uz
— Elon Musk (@elonmusk) July 15, 2026
Starting with Blastar, a simple space shooter game Musk coded at 12 years old and sold to a South African magazine for $500. From there the timeline moves through a commercial career that started with Zip2 in 1995, a city guide software company sold to Compaq for roughly $300 million in 1999. That was followed by X.com in 1999, which merged with Confinity to become PayPal, acquired by eBay in 2002 for $1.5 billion. SpaceX came in 2002, Tesla in 2003, SolarCity in 2006, the Supercharger network in 2012, Neuralink in 2016, The Boring Company in 2016, OpenAI co-founded in 2015, X acquired in 2022, xAI in 2023, Optimus in 2024, the Cybercab in 2026, and most recently SpaceXAI following the SpaceX and xAI merger. The gallery will also likely include items that blur the line between product and cultural artifact, among them The Boring Company’s Not-a-Flamethrower from 2018, Tesla Short Shorts from 2020, and Burnt Hair perfume released under X in 2022.
Lifestyle
Tesla makes the cut on California’s newest EV Rebate program
California just signed a $270 million EV rebate into law and it starts this summer.
California Governor Gavin Newsom signed SB 168 into law on Monday, July 13, 2026, creating a $270 million EV rebate program that delivers money directly at the dealership rather than as a tax credit applied months later. The program, called MyFirstEV, is funded equally by California’s state budget and participating automakers, with each contributing $135.5 million to make the math work.
The timing is directly tied to the loss of federal support when the $7,500 federal EV tax credit ended, removing the most significant consumer incentive that had driven EV adoption in the U.S. California, which accounts for roughly one-third of all EVs sold nationally, moved to fill that gap with a state-level replacement.
The rebate structure is straightforward. First-time EV buyers can receive $3,500 off any new battery-electric vehicle with an MSRP up to $50,000. Used EVs priced at $25,000 or below qualify for a $1,750 rebate. The credit is applied at the point of sale, which removes the friction of the old federal system where buyers had to wait for tax season to see the benefit. The program goes live later this summer, with the California Air Resources Board expected to release full participation details next month.
California hits Tesla Cybercab and Robotaxi driverless cars with new law
For Tesla buyers, the implications are mixed. The Tesla Model 3 RWD at $42,490 and the Model 3 Long Range at $47,490 both fall under the $50,000 cap and would qualify for the full $3,500 rebate for first-time buyers. The Model Y, which starts at $44,990 after Tesla’s recent price adjustment, also qualifies. The Model X, Model S, and Cybertruck all exceed the cap and receive no benefit. As Teslarati has reported, the program also includes a carve-out exempting California-based automakers like Rivian and Lucid from the price cap entirely, a provision that puts Tesla at a disadvantage since it relocated its headquarters to Texas in 2021.
Other qualifying vehicles include the Chevrolet Equinox EV, Ford Mustang Mach-E, Hyundai Ioniq 5, Kia EV6, and Volkswagen ID.4.
Tesla enters two new markets on two different continents in one week
SpaceX announces new Starship 13 test flight target date
