Bus smashes into cars in California store parking lot https://twitter.com/i/status/1598980362415194112

Started by a a in sci.electronics.design44 minutes ago 6 replies

Bus smashes into cars in California store parking lot https://twitter.com/i/status/1598980362415194112

Bus smashes into cars in California store parking lot https://twitter.com/i/status/1598980362415194112


A letter to President Biden

Started by Mike Monett VE3BTI in sci.electronics.design47 minutes ago 113 replies

I sent a letter to President Biden. It reads as follows: Dear President Biden, Congratulations on your legislative successes that benefit...

I sent a letter to President Biden. It reads as follows: Dear President Biden, Congratulations on your legislative successes that benefit everyone in America. These are hard-won and you deserve all the rewards. I address a problem that affects everyone on the planet. Russia is targeting Ukraine residents and infrastructure with long range Iranian drones. These have c...


Why is an EV's backup power less than it's driving power?

Started by Commander Kinsey in sci.electronics.design1 hour ago 204 replies

If an EV has an output power of say 80kW to drive the motors when driving, why is the backup power (to power your house in a power outage) only...

If an EV has an output power of say 80kW to drive the motors when driving, why is the backup power (to power your house in a power outage) only about 10kW? It's the same battery! And why do people say it costs thousands of dollars to fit something to do this? Surely a 10kW invertor doesn't cost much, just something to make 400VDC into 240VAC. I'd say more like 500 dollars.


Li-ion UPS battery substitution in UPS

Started by Bert Hickman in sci.electronics.design1 hour ago 59 replies

Does anyone have any experience swapping out old lead-acid batteries for Li-ion equivalents in a UPS? I see these batteries advertised as...

Does anyone have any experience swapping out old lead-acid batteries for Li-ion equivalents in a UPS? I see these batteries advertised as replacements, but I'm concerned about their safety in this application. New Li-ion UPS systems seem to be extremely expensive.


Driving EV did not help much so far, American EVs reduced gasoline consumption by just 0.54% in 2021

Started by Jan Panteltje in sci.electronics.design1 hour ago 18 replies

American EVs reduced gasoline consumption by just 0.54% in 2021 ...

American EVs reduced gasoline consumption by just 0.54% in 2021 https://arstechnica.com/cars/2022/11/american-evs-reduced-gasoline-consumption-by-just-0-54-in- 2021/ Conclusion of article: back to grass huts and walking and chasing rabbits for food?


So, you are thinking about buying an electric truck...

Started by Flyguy in sci.electronics.design1 hour ago 52 replies

...well, THINK AGAIN! Electric trucks are great for a run to the dump, but not much else. First, the weight of the battery is 3,000 lb! This is...

...well, THINK AGAIN! Electric trucks are great for a run to the dump, but not much else. First, the weight of the battery is 3,000 lb! This is dead weight that SUBTRACTS from the tow capacity and brings the Hummer's weight up to a massive 9,400 lb. This limits the Hummer's tow capacity to 7,000 lb, not very much when you are looking at super-duty trucks. The Hummer sports an impres


Why is bluetooth 5 throughput (2Mbps) much lower than data rate (48Mbps)?

Started by Commander Kinsey in sci.electronics.design2 hours ago 2 replies

Why is bluetooth 5 throughput (2Mbps) much lower than data rate (48Mbps)? I can understand a small difference, but a factor of 24?!?

Why is bluetooth 5 throughput (2Mbps) much lower than data rate (48Mbps)? I can understand a small difference, but a factor of 24?!?


Any Field Strength Guys Here?

Started by Mike Monett VE3BTI in sci.electronics.design2 hours ago 12 replies

I am trying to find the field strength of a 1 Watt (30 dBm) signal with an isotropic antenna at a distance of 15 kilometers. I need to...

I am trying to find the field strength of a 1 Watt (30 dBm) signal with an isotropic antenna at a distance of 15 kilometers. I need to compare this to a GPS signal of -125 dBm. Anyone know how to find this? -- MRM


The United States has seen roughly 1,110,000 deaths related to firearms in the country from 1990 to 2021, according to a study published in the JAMA Network Open, an open-access medical journal.

Started by a a in sci.electronics.design4 hours ago 1 reply

The United States has seen roughly 1,110,000 deaths related to firearms in the country from 1990 to 2021, according to a study published in the...

The United States has seen roughly 1,110,000 deaths related to firearms in the country from 1990 to 2021, according to a study published in the JAMA Network Open, an open-access medical journal.


Why GM dealers are quietly repairing Teslas

Started by Fred Bloggs in sci.electronics.design5 hours ago 17 replies

For some Tesla owners, getting to a nearby Buick dealership is a lot easier than working through Tesla’s complex repair network. General...

For some Tesla owners, getting to a nearby Buick dealership is a lot easier than working through Tesla’s complex repair network. General Motors dealerships have repaired more than 11,000 Teslas over the past year. General Motors has a network of thousands of dealerships – so many that, the company estimates, 90% of Americans live within a 10-mile drive of one.


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