Endless Sphere

marty wrote: ↑

Feb 19 2020 6:02am

CPAP is Continuous Positive Airway Pressure. I tried it. Made my ears feel like I was on a airplane. Add this to the list of stupid inventions.

One that has saved (and extended) a lot of lives. But it's your (and your wife's) choice, of course.

So it needs to be powerful (30-35 mph average would be great), very reliable, and good value - I'd prefer not to spend $3000+ on this 'experiement'. That's doable - but it is going to be hard to do it for less than $3000 unless you do most of the work yourself. 30mph average is going to take a LOT ...

so j1772 into a 220ac to 72v dc 30amp isolated charger direct to battery and im good, I can plug in my battery when its dead at 51v and I can pull the plug and stop charging at 70 volts and keep going I would not design something that would overcharge a battery if you forget. Also, you need a devic...

John in CR was talking about fast charging through a phase wire Yikes, a lot to go through here. Yes, it can work. (We designed a charger for one of the early Ford EV projects using that system.) How it works is that you use one of the motor windings as the inductor in a buck converter. Since the c...

SaladFish wrote: ↑

Feb 17 2020 10:46pm

Detecting that the work has been done and the bike has been used by the defendant is sufficient for conviction.

OK, so the work will be untraceable but you can be convicted. Fair enough.

Hello A friend of a friend in some country far away asked me to post this question for theoretical reasons. I am interested to know if there is an untraceable way to: Disable 25km limit on a pedlec? Enable throttle? Undetectable? No. Untraceable? Yes. Unless you sign your work, no one is going to b...

Better to get a charger that will stop automatically. Agreed. Relying on a BMS (or a buzzer) to stop a charge or a discharge is a bad, bad idea. Lithium ion batteries can go up in flames quite easily; have at least two methods of preventing overcharge and overdischarge (like a working BMS and a vol...

I guess you mean if you have 2 packs in parallel? No, series. When they are in series, whatever discharge current one sees, the other will see. By definition. Two batteries in series will see exactly the same current - but voltage will not be forced to be the same. Two batteries in parallel will se...

It is possible to connect two identical packs in series. They key is that they must be the same capacity and have similar internal resistance so that they are discharged at the same rate. That can be tricky even with two similar packs. Just a note - if you have two of the same type packs in series ...

I can't tell if you're deliberately dishonest or just delusional but either way you're full of it... Neither. He's playing the "redefine words to win the argument" game. It's a popular game to play when you are losing an argument. "Well, it depends on what the meaning of 'is' is."

Kumal Nayyar?

Kimmo57 wrote: ↑

Feb 13 2020 9:46am

How does the BMS control 4 cells in the module with just these connections?

With 4 cells you need 5 connection points:
Negative
Top of cell 1
Top of cell 2
Top of cell 3
Positive

Note in the picture there that you have 6 connection points.

Thanks the idea. Did you have any particular diodes at digi key that you suggest? Not specifically. I'd go with the cheapest diodes that: 1) meet the current rating 2) have the right forward voltage loss. Usually they are around .5 to .7 volts. Don't forget the switch to bypass them once you start ...

uxcell New BIG-Size Voltage Converter Regulator DC/DC DC 24V Step-Down to DC 12V 40A 480W Buck Transformer Waterproof https://www.amazon.com/dp/B01LYK6G2Y/ref=cm_sw_r_cp_apa_i_iO4qEb621NBQN I am suspicious: " If you use the pulsed DC power provided by the generator, please filter it with capac...

When john saw your post he couldn't stand someone having something complimentary to say about my threqd so he had to intervene and let you know his truth Uh - no. He had a comment. That's what forums are for. However, if comments in a thread you start will make you sad and upset, I agree that it's ...

And that's literally the whole reason. Most of these cities looking at partial car bans in specific areas are doing so because they were simply not built for cars and getting rid of them would just be *better* than shoving a big, square peg into a tiny hole. Yep. And that's true of some US cities a...

Other than using my van during our move 1.5 years ago, it's been 5 years since I bought a tank of gase or quart of oil, or even paid the annual registration or inspection fees. 12 years of electric bike has saved our family at least $30,000 , so what I've spent on the hobby has us way in the plus a...

John in CR wrote: ↑

Feb 11 2020 1:58pm

No way a hybrid. Fully electric only, and probably DIY.

I recently got a Prius Prime and it's been great. The battery (8kwhr) just about covers my commute, which is 90% of my driving. My average MPG is over 199 (that's as high as the gauge goes) and I go to the gas station about twice a year.

I don't think it is to protect the motor... likely some sort of voltage regulator drops the 12V down to 3v or 5v for the IC. Yep, and 16V is a very common max voltage for electrolytic caps, and a common "abs max" for higher voltage IC's. So bringing that 16.8V down to 15V might get you ov...

I have to admit, I hadn't heard of the Outback Skybox, and missed it on their website; it looks like a good fit for people with a highly integrated, high-voltage PV grid-tie installation who want battery backup. I will add if UL, CEC etc approval is not necessary there are a lot of options. The Vic...

You are obviously not aware of the scale of Teslas door handle issue. And your research on Au tesla used cars confirms your limitations... :roll: Just one site alone lists 62 used Teslas.. WOW! 62 used Teslas being sold out of 921,446! Why, that's almost .007% of sales, and indicates that, at best,...

At the very least the diodes would let me test if the "high voltage" cutoff is active all the time or just at startup... and since the motor isn't running at startup, the current would be very low on the diodes... Otherwise I would need about a 60 amp solar diode if I want to run the moto...

Just put a few diodes series on the + battery rail, then have a switch to short them out. When you first power on the diodes will drop the voltage about 1.8 volts (ie 16 to 14.2 volts) and the motor will start up. Then once it's running use the switch to short out the diodes. The voltage drop caused...

miro13car wrote: ↑

Feb 11 2020 9:21am

because they make less money on them.

In a way, yes. Developers choose profit margins for all their homes. But since few people want small homes compared to large homes, they can't sell very many and therefore don't make as much money on them.

miro13car wrote: ↑

Feb 10 2020 5:45pm

No developer can build small below say 600sqfoot houses
banks rule our lives .

They can easily do that. No one buys them when they can buy a 1200 sq ft house for just a little more.