Search found 599 matches

by JackFlorey
May 24 2022 10:39pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

Around $2.8 to 3.8 (with battery). Around 5.5 -7.5 year payback. How long do they live and what are the typical associated maintenance costs as they age. Given a 15 -20 year life cycle, what is the typical cost to produce a kwh for the average location- system. On my old house the solar system has ...
by JackFlorey
May 24 2022 6:28pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

speedmd wrote:
May 24 2022 7:54am
Anyone know the avg cost out in $/kwh for the average home roof top setup if you can afford the roof?
Running around $3/watt.
by JackFlorey
May 24 2022 4:05pm
Forum: Large EV General Discussion
Topic: Just Bought a Nissan Leaf With a Pretty Bad Battery
Replies: 8
Views: 120

Re: Just Bought a Nissan Leaf With a Pretty Bad Battery

Will the can bus analyzer let you see the cells without dropping the battery? Essentially I am asking if you know where you splice or plug in to get a reading? Seems like the best place to start. With just the CAN bus analyzer you can get cell voltages. You have to request them and then they are se...
by JackFlorey
May 23 2022 10:25am
Forum: Large EV General Discussion
Topic: Just Bought a Nissan Leaf With a Pretty Bad Battery
Replies: 8
Views: 120

Re: Just Bought a Nissan Leaf With a Pretty Bad Battery

Is disassembling the battery and then testing each cell to replace the bad ones a crazy idea? Not that crazy. Get a CAN bus analyzer so you can check out what the cell voltages are. If a few are very low near the end of discharge, it might be worth seeing if they are fixable. If, for example, four ...
by JackFlorey
Apr 27 2022 10:01am
Forum: Battery Technology
Topic: Designing a Bidirectional dc dc converter
Replies: 8
Views: 363

Re: Designing a Bidirectional dc dc converter

I want the switches to work automatically based on the direction of power flow. Till now, I was connecting the switching pulses to the mosfets manually. You can _sort_of_ do that. You have two choices there. One, you can do a fixed-ratio converter, where there is no feedback. Vicor makes these. You...
by JackFlorey
Apr 25 2022 2:44pm
Forum: EBike Technical
Topic: looking to build a solar E-bike charging system
Replies: 18
Views: 414

Re: looking to build a solar E-bike charging system

I have built a solar system for my truck so know my way around a solar setup. But as I was describing the system it seemed silly to go from Solar energy to 12v to a battery to then go through an inverter to a power brick to return back to DC to charge the bike battery. Is there anyway to go from so...
by JackFlorey
Apr 25 2022 2:32pm
Forum: Battery Technology
Topic: Designing a Bidirectional dc dc converter
Replies: 8
Views: 363

Re: Designing a Bidirectional dc dc converter

As we all know, in the boost mode, one of the two mosfets acts like a diode; while the other mosfet behaves like a switch. Likewise, in the buck mode operation, exactly the opposite happens. Sort of. In a bidirectional converter of any reasonable power level you have to think of both top and bottom...
by JackFlorey
Apr 24 2022 10:44pm
Forum: E-Vehicles General Discussion
Topic: How to make a mosfet switch?
Replies: 25
Views: 434

Re: How to make a mosfet switch?

Darren2018 wrote:
Apr 24 2022 6:46pm
This is how I have connected it?
You have your charger connected to one of the phase connections? That can work but you need VERY specific software (and a way to lock the rotor on a BLDC) to get it to work.
by JackFlorey
Apr 24 2022 5:50pm
Forum: E-Vehicles General Discussion
Topic: How to make a mosfet switch?
Replies: 25
Views: 434

Re: How to make a mosfet switch?

When I googled isolated DC-DC schematic most of the designs used what looked like a coil so I just copied it. Ah, OK. Usually I just use a box to make it clear that it's an assembly, not a transformer. The reason I want to switch the positive is because I initially tried to switch it using the BMS ...
by JackFlorey
Apr 24 2022 4:52pm
Forum: E-Vehicles General Discussion
Topic: How to make a mosfet switch?
Replies: 25
Views: 434

Re: How to make a mosfet switch?

Darren2018 wrote:
Apr 24 2022 1:01pm
Would this be ok
No. You will blow the gate of that MOSFET. No MOSFET is going to withstand -92 volts on its gate.
by JackFlorey
Apr 24 2022 4:13pm
Forum: E-Vehicles General Discussion
Topic: How to make a mosfet switch?
Replies: 25
Views: 434

Re: How to make a mosfet switch?

I think I might need a P channel because I need the positive +90V wire to be switched :confused: . Maybe I could use your design for my other projects which do not require the positive to be switched. Do you know how to make the same thing but with a P channel mosfet? Also do I need to put a diode ...
by JackFlorey
Apr 24 2022 11:01am
Forum: E-Vehicles General Discussion
Topic: How to make a mosfet switch?
Replies: 25
Views: 434

Re: How to make a mosfet switch?

Darren2018 wrote:
Apr 23 2022 11:51pm
Please could you show me how to set this up? I might be able to figure it out myself but I don't want to break anything else :confused:
Sure try this:
by JackFlorey
Apr 23 2022 10:15pm
Forum: E-Vehicles General Discussion
Topic: How to make a mosfet switch?
Replies: 25
Views: 434

Re: How to make a mosfet switch?

I would like to switch an isolated DC-DC which steps down the 92.4V max battery to 13.8V as this powers my uLight/Nucular. The step down converter makes a huge spark when it is at zero volts. I need it to switch the battery side so it completely disconnects it from the battery so as to not draw any...
by JackFlorey
Apr 15 2022 10:51pm
Forum: General Discussion
Topic: Just had an earthquake in Los Angeles
Replies: 162
Views: 21702

Re: Just had an earthquake in Los Angeles

fechter wrote:
Apr 15 2022 10:07am
10 hours ago 4.6 magnitude, 14 km depth
El Sauzal, Baja California, Mexico
Aftershocks:
1 hour ago 2.1 magnitude, 11 km depth
Santa Anita, Baja California, Mexico
Yeah felt that one here.
by JackFlorey
Apr 14 2022 11:31am
Forum: General Discussion
Topic: Ultra high efficiency bicycle / office heaters
Replies: 14
Views: 411

Re: Ultra high efficiency bicycle / office heaters

True, but an insulated heating pad and an office chair with various plastics and synthetic materials that's are not rated for the kind of spot heat that a heating pad may generate. Or at least, i am not interested in sacrificing a nice $300 chair to find out. If it's insulated, the heat doesn't get...
by JackFlorey
Apr 13 2022 10:57pm
Forum: General Discussion
Topic: Ultra high efficiency bicycle / office heaters
Replies: 14
Views: 411

Re: Ultra high efficiency bicycle / office heaters

Made for lizards, but the ~150 watts coming out of the thing efficiently warms up a human MUCH better than a typical heat element + coil of the same power ( pictured on the left ): If you use an insulated heating pad, very close to 100% of the energy of the pad gets into your body. If you use one o...
by JackFlorey
Apr 10 2022 4:43pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

We still haven't got a damn clue what to do with the high level waste, which is kind of a problem even if we don't add any more capacity. ?? Sure we do. Leave it there forever in dry cask storage. Move it to the desert and leave it in dry cask storage forever. Move it underground and leave it there...
by JackFlorey
Apr 10 2022 4:40pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

That is the idea: reduce component stress and improve reliability. Then I'd go with MOSFETs. Lower loss so lower stress. And MOSFETs, unlike bipolars or IGBT's, share current very well, so the more devices you add the lower the stress. There are a number of LiFePO4 batteries that can charge from 0-...
by JackFlorey
Apr 09 2022 6:06pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

If one wants a charger built directly into the inverter capable of using a 480V Tesla Supercharger or Porsche's 800V fast chargers, IGBTs become a necessity. At those voltages - agreed. But there's simply no practical way to use them as the primary switches on an inverter if the inverter is operati...
by JackFlorey
Apr 09 2022 5:50pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

Is it still? Yep. It's even in a Beach Boys song! "San Onofre and Sunset Redondo Beach, LA All over La Jolla And down Doheny Way Everybody's gone surfin' Surfin' USA" And just try to get a campsite there in summer. Attitudes and whats acceptable, change over time due to the marketing camp...
by JackFlorey
Apr 09 2022 2:13pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

calab wrote:
Apr 09 2022 2:03pm
Most people would want to move away from a place with a nuclear power plant.
I lived about 10 miles from a nuclear plant for years. It was a very popular surfing/camping location.
by JackFlorey
Apr 09 2022 1:03pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

Have always been on the fence about nuclear power. Have moved away from it. Radioactive pollution can not be cleaned up, used fuel can not be disposed of. It's the most expensive power. So why? Don't see the plus side anymore. Base load power. You can't beat it for providing a fixed amount of energ...
by JackFlorey
Apr 09 2022 12:59pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

I'm aware of this amount of current being required. The trick is to use high-current, low voltage IGBTs when making the inverter. That would be a poor choice. MOSFETs have a fixed on-resistance. As current increases, their losses go up at a rate of I^2. IGBT's have a fixed on-voltage. As current in...
by JackFlorey
Apr 08 2022 10:37pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

As usual you are avoiding facts.. You are quoting annual “AVERAGES”, Nope. I am quoting availability. But you knew that and are just intentionally misunderstanding to have something to argue about. So i wont waste time responding to comments that have no basis in reality. You promise? Great! We sha...
by JackFlorey
Apr 08 2022 5:00pm
Forum: General Discussion
Topic: gas price thread
Replies: 1289
Views: 89350

Re: gas price thread

Hillhater wrote:
Apr 08 2022 4:47pm
And ask yourself why they didnt decide to go with wind for that new capacity instead of Nuclear ?
They did both. They have committed to another 16GW of wind before 2030, to go along with their 12GW of nuclear reactors - which won't be ready until 2042.