River Bank is the stackable battery for everything you power, everywhere you go | 19mm Momentary Push Button

You need to factor in the kWh you used within the week (along with the cost per kWh). This will give people a better idea of actual cost to power this vehicle 253 miles.

Heat damage from increased resistance is pernicious. P = I^2 * R. At 24 amps, a resistance of a mere tenth of an ohm is 57 watts – almost twice as much as a pencil soldering iron! That’s why it’s important to get those crimps done right and inspect them frequently for signs of degradation. I will readily concede that I am not equal to a manufacturer in terms of consistency and reliability of crimps, even with a ratcheting tool. The only way I can make up for that is keeping an eye on things to catch early degenerative changes before things get out of hand. Part and parcel of building high powered electrical equipment by hand is being ever vigilant when using it.

Steady in the dark. The Sony A33′s Handheld Twilight (HHT) mode uses multiple shots and micro-alignment to permit handheld exposures even in very dark conditions. This was a very dark bar scene, but the shot came out sharp enough for a 5×7 print. It could have used some exposure adjust and (definitely) a different white balance setting. Exposure is auto-only in HHT mode, but the similar multi-frame NR mode gives full control.

1) the frequency (50-60 Hz) tends to make muscles spasm repeatedly (DC spasms and stays there) 2) the frequency can interfere with cardiac electrochemical signalling (your heart goes into fibrillation) 3) the current can pass through capacitance (shielding) and via inductance 4) the current can pass through ground return and other single-wire, open circuit States

Step 3: Use the pulse-rating curves (Fig. 2) in the same datasheet to determine pulse capabilities relative to the 40 pulses at the 1000-A requirement.

My Tesla Model 3 came a week ago, Thursday, and I traded in my Volt. So, I swapped out the NEMA L6-20, for an Eaton box with NEMA 14-50 receptacle, 8ft of 6-4 wire, and a 50 amp double-pole breaker. About $75 at Lowes. Yes, the Tesla came with a L2 EVSE that charges at 32 amps. You could buy the Tesla HPWC for $350, I think, but it’s totally not necessary for most.

Agreed, this is a house fire waiting to happen and your insurance co. won’t give you a cent if an investigation points to this homecooked thing as the firestarter. There are numerous commercial alternatives which are small enough to fit in a junction box _and_ are UL/FCC/CE approved. Granted, they aren’t as cheap as the ESP module and the triac described here, but in the end, most cheap alternatives to switching powerful currents turn out to be very expensive after all.

But at the end of the training it says “you can ignore all of this if you are troubleshooting”. If you are afraid of live circuits, stay at your desk where it is safe…

Dust particles are often flammable, in high densities this means they’re explosive. https://en.wikipedia.org/wiki/Dust_explosion

You need to learn how to read a datasheet and understand the terms – without an understanding it won’t do you any good.

The plug-in Kia Niro has an 8.9 kWh battery (vs. 1.6 kWh in the regular car). You can quickly estimate the amount of kWh you used in the week as long as the battery was fully drained every time you plugged the car in (it’s fully drained if the gasoline engine kicks in) and you know how many times you charged the car.

A 25A relay seems perfect for a 22A load. If the relay is really built for 25A and not only marked as one. What use had a maximum rating when you could never really use it?