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by Hillhater
Oct 22 2019 2:50am
Forum: EV Business World
Topic: Do you know this man ?
Replies: 7
Views: 179

Re: Do you know this man ?

Business ethics ?,...nepotism ?..fraud ?
by Hillhater
Oct 22 2019 2:47am
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 26
Views: 412

Re: Testing the internal resistance of a li ion cell and making determinations

Punx0r wrote:
Oct 22 2019 2:36am
It makes sense as a cell that sags under load will slowly recover its terminal votlage when that load is removed, ....
Yes, but not to its previous voltage level., unless the load was very brief.
by Hillhater
Oct 22 2019 2:40am
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 26
Views: 412

Re: Testing the internal resistance of a li ion cell and making determinations

.. Also all controlled cell tests at significant discharge (1.0C++) show very noticeable heating. I don't dispute that. But I doubt that your 1.5C discharge generates a steady 3W of heat per cell from internal resistance alone. All sources of heat-- exothermic reaction, resistance in the interconne...
by Hillhater
Oct 22 2019 1:34am
Forum: EV Business World
Topic: Do you know this man ?
Replies: 7
Views: 179

Re: Do you know this man ?

There is another clue in the forum title :wink: :wink:
by Hillhater
Oct 21 2019 11:01pm
Forum: Battery Technology
Topic: Charge 52V Dolphin with this MPT-7210A?
Replies: 13
Views: 1680

Re: Charge 52V Dolphin with this MPT-7210A?

Thanks S
Im on the hunt for a portable bulk charger that can handle 10s,15s, 18s occasionally without too much reconfiguring.
The 7210A looks like a possibility
by Hillhater
Oct 21 2019 8:20pm
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 26
Views: 412

Re: Testing the internal resistance of a li ion cell and making determinations

No. I have only my observations that very saggy batteries don't get as hot as P=I^2R would imply. Mostly they don't get noticeably hot at all, despite the chemical reaction in lithium cells being exothermic on discharge. . Well , my 18650 packs do get warm, even with relatively light loading of.1.5...
by Hillhater
Oct 21 2019 7:29pm
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 26
Views: 412

Re: Testing the internal resistance of a li ion cell and making determinations

Explanation to the pictures : all three are recordings from DCIR measurement of LG MJ1 cell. Voltage drop is always result of the measuring constant current. At the first picture is current 0,5C = 1,7 A , at second recording is measurement according IEC 61690-3 standard 0,2C = 0,68A for 10 s then i...
by Hillhater
Oct 21 2019 7:13pm
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 26
Views: 412

Re: Testing the internal resistance of a li ion cell and making determinations

Punx0r wrote:
Oct 21 2019 5:07pm
Who's got an accurate calorimeter??? :!:
Isnt there enough temperature data from the testing sites ( Ecig, Lygte, etc) to show how much heat is generated under various discharge conditions ?
by Hillhater
Oct 21 2019 6:52pm
Forum: EV Business World
Topic: Nissan Leaf battery replacement (Australia)
Replies: 9
Views: 152

Re: Nissan Leaf battery replacement (Australia)

To add a bit of perspective, and let you all know this is not just a dig at EVs or Nissan,... That same “autoexpert” site has several articles on ICE manufacturers attempting outrageous moves on consumers. Ther are 2 separate examples of Jeep owners being quoted Au$50k and Au$30+k for fuel system re...
by Hillhater
Oct 21 2019 6:17pm
Forum: E-Vehicles General Discussion
Topic: Solar challenge lead car burns
Replies: 5
Views: 177

Re: Solar challenge lead car burns

......? What causes the fires? I have not seen any details, but i suspect the primary cause is related to the over confidence and lack of experience in these student groups, amplified by the pressure of involvement in an international competition under the view of world media. They are pushing tech...
by Hillhater
Oct 21 2019 4:36pm
Forum: EV Business World
Topic: Do you know this man ?
Replies: 7
Views: 179

Re: Do you know this man ?

A clue ...he is a Chef by profession. !
by Hillhater
Oct 21 2019 12:42am
Forum: EV Business World
Topic: Nissan Leaf battery replacement (Australia)
Replies: 9
Views: 152

Re: Nissan Leaf battery replacement (Australia)

The situation in this story is due to a dealer that doesn't know what he's doing. It was in the news, and it has been addressed by Nissan. Addressed how ?? ....with a free pack replacement ? (The smart business move , and correct thing to do in this situation) ... or, with a $10k pack replacement o...
by Hillhater
Oct 20 2019 7:21pm
Forum: EV Business World
Topic: Do you know this man ?
Replies: 7
Views: 179

Do you know this man ?

..do you know who he is. ( with out using an image search app )
And what he did to be paid $6.8m last year ?
Image
by Hillhater
Oct 20 2019 7:18pm
Forum: EV Business World
Topic: Nissan Leaf battery replacement (Australia)
Replies: 9
Views: 152

Re: Nissan Leaf battery replacement (Australia)

You think a Au$33k. Cost for a battery replacement is not an issue ?
..even after 7 years ?
Like the report says,..that makes it a “disposable” car .!
by Hillhater
Oct 20 2019 6:42pm
Forum: EV Business World
Topic: Nissan Leaf battery replacement (Australia)
Replies: 9
Views: 152

Nissan Leaf battery replacement (Australia)

Phillip Carlson bought a Nissan Leaf in August 2012, which cost about $53,500. It’s seven years old today, and it’s worth maybe $12,000 - if you can find someone dumb enough to buy it. Let’s let him tell the story. “I bought an electric car from Nissan with 5 years warranty on the battery. They cla...
by Hillhater
Oct 20 2019 5:26pm
Forum: Battery Technology
Topic: Testing the internal resistance of a li ion cell and making determinations
Replies: 26
Views: 412

Re: Testing the internal resistance of a li ion cell and making determinations

I tested the internal resistance of a 18650 sanyo cell using the following method No load test = 4.01 V 2 ohm 5 watt resistor load test = 3.80 V ohms law 3.80 V / 2 ohm = 1.9 Amps Kirchhoff voltage law (sum all algebraic values of V drops = 0) 4.01 - 3.80 = .21 V (4.01 - 3.80 - .21 = 0) .21 V / 1.9...
by Hillhater
Oct 20 2019 4:40pm
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 93
Views: 2123

Re: Samsung 40T and other cells like it?

You should search a little harder...... https://endless-sphere.com/forums/viewtopic.php?t=94329 Sorry, I don't understand what you just showed me here, it's the same one I have that turns out is measuring AC and the rest is a conversation about VTC4 cells. I'm looking for a DCIR meter, something af...
by Hillhater
Oct 20 2019 7:38am
Forum: Battery Technology
Topic: Samsung 40T and other cells like it?
Replies: 93
Views: 2123

Re: Samsung 40T and other cells like it?

You should search a little harder......
viewtopic.php?t=94329
by Hillhater
Oct 19 2019 5:14pm
Forum: Battery Technology
Topic: Charge 52V Dolphin with this MPT-7210A?
Replies: 13
Views: 1680

Re: Charge 52V Dolphin with this MPT-7210A?

I've unfairly maligned this charger. My apologies. Sunder, can you give an update on the 7210A.. Is it still working reliably ? Does it stop the charge when a min current level is reached, or is it just time based ? Are you still running it from a power supply , rather than solar ? Any other proble...
by Hillhater
Oct 17 2019 7:01pm
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 16
Views: 272

Re: Charger like LiPro 6S

As with any RC type charger, there are good and bad experiences.. they all seem to have a limited life and various other issues. The 7210 A certainly has mixed reviews, and much mis information floating about, but as you say most of the issues seem to be with those using it from solar panel (variabl...
by Hillhater
Oct 17 2019 8:08am
Forum: E-Vehicles General Discussion
Topic: Solar challenge lead car burns
Replies: 5
Views: 177

Solar challenge lead car burns

..The leading solar car competing in the World Solar Challenge has burst into flames, forcing the team out of the race for the first time in 20 years. Key points: The Vattenfall solar car caught alight just south of Port Augusta The solar car was this morning leading the World Solar Challenge The t...
by Hillhater
Oct 17 2019 4:33am
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 16
Views: 272

Re: Charger like LiPro 6S

Maybe consider this charge controller ( you will still nee a DC power supply for it....or solar ! ), as a possible budget tool. Has fully adjustable charge voltage..12 to 72 v, adjustable charge current , etc, and cheap $30.. I have no personal experience with it, so check out the feedback and revie...
by Hillhater
Oct 16 2019 4:42pm
Forum: Battery Technology
Topic: Charger like LiPro 6S
Replies: 16
Views: 272

Re: Charger like LiPro 6S

Guys, read the OP again.... I am looking for a device like this to put in a maker space attached to a school to use for eBikes and scooters and DIY projects. To allow for all kinds of visitors to charge, to support DIY, to troubleshoot, to teach. The charger system needs to be foolproof and safe.......
by Hillhater
Oct 16 2019 2:45am
Forum: E-Vehicles General Discussion
Topic: Can EVs survive without subsidies ?
Replies: 12
Views: 261

Re: Can EVs survive without subsidies ?

. After range the primary concern is costs of battery replacement. Much like concern for the life expectancy of the engine when buying an IC car. Having a long lasting motor is a primary concern. Purchase price and major running costs are much higher up the list. Battery life or motor life are sour...
by Hillhater
Oct 15 2019 8:53am
Forum: E-Vehicles General Discussion
Topic: Wind and Solar vs Coal, Gasoline, Nuclear
Replies: 5284
Views: 211838

Re: Wind and Solar vs Coal, Gasoline, Nuclear

What exactly are you whineing on about now jimmy ?
Trends are “shyte” ? Are they.
Or the time lag between temp and CO2 in the historical data ?
At least try to explain your point in adult terms rather than spoilt brat , non specific, insults .