What do you think ? [dodgy looking ebay items] - Page 1
Forum section: electronics / general

author: bilko
author_rank: Frequent Contributor
timestamp: August 17, 2012, 11:22:23 pm
content: Would you buy this ?It looks a bit of a jokehttp://www.ebay.co.uk/itm/10w-solar-panel-boost-board-dc-in-3v-to-dc-35v-output-adjustable-/221070018053?pt=LH_DefaultDomain_0&hash=item3378ccc605and this, I just happen to have a set of pruning shears that take 8kWhttp://www.ebay.co.uk/itm/8000w-modified-power-inverter12v-220v-inverter-/220588367326?pt=UK_Home_Garden_PowerTools_SM&hash=item335c175dde

author: chickenHeadKnob
author_rank: Super Contributor
timestamp: August 17, 2012, 11:56:02 pm
content: Hmm, vero board , china, top rated seller (romanticisland), china, ebay, china -- what could go wrong? You be the first buyer

author: DeanA
author_rank: Regular Contributor
timestamp: August 18, 2012, 07:59:36 am
content: I think you should have a more descriptive subject title for your post.And then to top it off we need to follow your link to even have a clue as to what you're discussing (which I didn't bother) - bad form in my opinion.

author: G7PSK
author_rank: Super Contributor
timestamp: August 18, 2012, 08:17:18 am
content: Run that converter of your car battery! For how long? At rated continuous power it is going to draw nearly 700 amps and at peak double that, most car starters will draw around 200 amps and a diesel engine starter around 500 amps and a large truck around 700 amps but only for a few seconds, most direct injection diesels on trucks fire by the first time a cylinder hits TDC. So at the most you are only going to get a few seconds of power from that inverter, but what will last longer the battery or the inverter.

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 09:40:19 am
content: Somebody needs to splain to the chinese how to put women into product photos without it being obvious that they are hoping the girl gets your attention instead of the product your buying.

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 18, 2012, 11:19:42 am
content: Quote from: Simon on August 18, 2012, 09:40:19 amin car ads, the subject at the back the deco (lady) at the front (which one to drive?) so in the link above, the lady is capable of 8000W inverting power and 20X (voltage) "enlargement".

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 11:20:51 am
content: Quote from: Mechatrommer on August 18, 2012, 11:19:42 amI think you have far too much time on your hands

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 18, 2012, 11:25:45 am
content: i hope so. enjoy while you still "exist"and oh, police jacket and england short, thats new humor? what kind of joke is that?

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 11:38:00 am
content: Quote from: Mechatrommer on August 18, 2012, 11:25:45 amI think you are as bad at "double meaning humor" as the Chinese at at putting scantily clad girls in their photos. Personally chinese women do not appeal to me ! so it's a turn off and I won't buy the product.

author: Psi
author_rank: Super Contributor
timestamp: August 18, 2012, 12:05:12 pm
content: Hm.. 16kW peak, at 12V that's 1333 Amps!

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 12:07:46 pm
content: Well you see it doubles up as heater50% in output, 50% heat in the connection cables

author: T4P
author_rank: Super Contributor
timestamp: August 18, 2012, 12:11:32 pm
content: Quote from: Simon on August 18, 2012, 11:38:00 amMassive turn off ... All china people turn me off ...

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 12:12:03 pm
content: you can talk haha

author: Psi
author_rank: Super Contributor
timestamp: August 18, 2012, 12:12:10 pm
content: At 12V it would be almost impossible to supply 1333A without the cables dropping a few volts and causing the unit to switch off.

author: AndyC_772
author_rank: Super Contributor
timestamp: August 18, 2012, 12:16:11 pm
content: I like the table at the end... the 10,000W unit can apparently only manage to provide 50W to a kettle. You'd be better off making tea by wrapping the 12V cables around the mug and letting them do the heating!

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 12:18:43 pm
content: Quote from: AndyC_772 on August 18, 2012, 12:16:11 pmyea reminds me of photoinductions idea of boiling a kettle

author: Psi
author_rank: Super Contributor
timestamp: August 18, 2012, 12:46:34 pm
content: Reminds me of when photonicinduction made a crowbar glow red hot.As that is what would happen to your 12V cables

author: SeanB
author_rank: Super Contributor
timestamp: August 18, 2012, 01:28:36 pm
content: I like the table, nice piece of wood there.

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 18, 2012, 02:25:51 pm
content: Quote from: T4P on August 18, 2012, 12:11:32 pmyou racism people! as long as they are genetically XX and fully functional, they are fine with me. reality is defined by electrical impulses interpreted by my brain. get over it, skip the "mind politics"

author: grumpydoc
author_rank: Super Contributor
timestamp: August 18, 2012, 02:27:40 pm
content: QuoteVery odd, I can understand that they might not like inductive loads but a kettle is pretty well just resistive isn't it?Oh, I know, it's 10,000musicwattsThere's another odd thing - part of the spec says "Efficiency 87%", that alone is bad enough for the 10kW version (1.3kW dissipated by the inverter) but at the bottom of the table it says "NOTE: If your machine is 1000W, then the battery need 1000W/12V = 83A x 3 times = 250A". Surely this implies only about 33% efficiency.Power Jack are well known to producedangerous shitthough aren't they?

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 02:39:10 pm
content: Quote from: grumpydoc on August 18, 2012, 02:27:40 pmThey may be trying to point out that a 1000W battery will last well under and hour at 1000W outpt but their wayof saying it is a bit ingrish.

author: poptones
author_rank: Frequent Contributor
timestamp: August 18, 2012, 09:25:31 pm
content: I did a check under completed listings, it appears they have sold several of those perfboard made solar panel convertors.What I don't get is HOW these chinese deals make them money? The thing sells for 99 cents SHIPPED. I've bought a few things like this and I still don't understand how they make any money. I certainly can't make any money selling things on ebay for a buck - by the time ebay and paypal take their cut and the postman takes his, I'd be "earning" about a dime!I have here three of those fiber optic "flower" decorations - the thing with the base with a color changing LED and a poof of fiber optics sticking out the top - and I paid less than four bucks for THREE of them delivered to my door! Now I have all this cheap optical fiber for experiments...

author: Simon
author_rank: Unknown
timestamp: August 18, 2012, 09:31:05 pm
content: Remember that eBay charges different fees in each country and has completely diffrent listing structures in some cases, for example Italy is max 10 days not 30 like the UK. I'd not be surprised if Europe is subsidizing eBay in china and I think their government subsidize the post.

author: mariush
author_rank: Super Contributor
timestamp: August 18, 2012, 10:33:13 pm
content: Yes, I think Hong Kong and China have subsidies or something because just rebates for volume selling doesn't explain how could some sellers do free shipping at low prices.I sell excess parts I have around from time to time on eBay and I simply can't go lower than about $.60 on postage alone, nevermind that a simple bubblewrap envelope is about $.20 if I don't order 300-500 at a time to get a better price.There's also the eBay fees of about 9%, paypal sucks a few percent as well... the only way I could compete is by service (keeping people updated about the package) and shipping fast ... if I pay about 15 cents extra for priority postage, I usually get my packages in 5-10 days to people in Europe.... the Chinese guys can't really get this fast yet.

author: pickle9000
author_rank: Super Contributor
timestamp: August 18, 2012, 10:49:58 pm
content: Is the girl included? That would make a diff with the selling price....mike

author: tom66
author_rank: Super Contributor
timestamp: August 18, 2012, 10:51:20 pm
content: I believe Photon measured the short circuit current of a standard car battery as being around 600 - 700 amps - so providing anywhere near that for an inverter, forget it...

author: bilko
author_rank: Frequent Contributor
timestamp: August 18, 2012, 10:58:22 pm
content: A standard car battery wouldn't cut it anyway. You need a bank of deep cycle batteries. For 8kw I would guess at 10 8D 220AH AGMs in parallel.www.batterymaster.com/pdf/tr/marina/Trojan%208D-AGM.pdfWhat's funny though is that the add says you can use this 8kw inverter to run shavers and pruners, a bit over capacity and highly inefficient for that task.I agree with comments about the table at the end of the advert. I wonder if they are quoting power in the same way as they quote a 2000W amplifier that runs off a 5W wall wart, who knows.

author: tom66
author_rank: Super Contributor
timestamp: August 18, 2012, 11:15:47 pm
content: Perhaps it's like the POS "1200W" car audio amplifier I was given to evaluate.Turned out the maximum power I could get it to draw was about 80W. When you include the maximum efficiency of a class-AB (78.5%), it puts it near 63W at best. Completely crap!

author: RCMR
author_rank: Frequent Contributor
timestamp: August 19, 2012, 01:37:01 am
content: Quote from: Simon on August 18, 2012, 09:40:19 amWas that a woman -- I thought it was a ladyboy

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: August 19, 2012, 02:00:09 am
content: Quote from: RCMR on August 19, 2012, 01:37:01 amSideways?

author: SeanB
author_rank: Super Contributor
timestamp: August 19, 2012, 06:11:17 am
content: Ed, you lead a sheltered life there in the outback..........

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: August 19, 2012, 06:29:07 am
content: Quote from: SeanB on August 19, 2012, 06:11:17 amhehehe

author: Simon
author_rank: Unknown
timestamp: August 19, 2012, 08:50:51 am
content: Quote from: mariush on August 18, 2012, 10:33:13 pmIt's 10% in the uk + 3.4% from paypal (applies to shipping and goods price) + 0.2GBP. By the time I have finished selling most stuff I've already lost about 15% to a bunch of tossers who don't actually give a shit when I have a problem with their crap service. I'm actually exploring ebid now but they have such a silly convoluted signup and selling structure it is no surprise they never took off.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: August 19, 2012, 09:03:06 am
content: I think they have the UK market cornered:

author: Simon
author_rank: Unknown
timestamp: August 19, 2012, 09:06:33 am
content: To be honest it's so pathetic I don't think most would "buy it", they need to pay millions to a marketing company before they'll get us to fool for that shit. That police jacket is just to hide the lack of um.... assets

author: tom66
author_rank: Super Contributor
timestamp: August 19, 2012, 09:32:48 am
content: eBay fees are extortionate, but because they have a monopoly, you are stuck with them. What other retail platforms charge 15%?

author: Simon
author_rank: Unknown
timestamp: August 19, 2012, 09:43:30 am
content: well people could use other platforms in protest. I am seriously looking at ebid. Cost me £0.05 for a buy it now type listing (eBay charge £0.40) and I forget what the fees would be if i sold anything but well under 10%. The only problem at the moment is that they are a maze to get started with and they try to get you to pay for a lifetime membership so it can be off putting.

author: Psi
author_rank: Super Contributor
timestamp: August 19, 2012, 10:35:44 am
content: In case you've not noticed, its a "power jack" inverter.The same brand as that post a while back, remember all the issues the guy documented with it.http://ludens.cl/Electron/chinverter/chinverter.html

author: bilko
author_rank: Frequent Contributor
timestamp: August 19, 2012, 02:03:20 pm
content: Quote from: Psi on August 19, 2012, 10:35:44 am@PSI,Thanks for the reminder, I knew I saw it somewhere else.It is a very inefficient design, there are 15 year old MSW inverters quoted at 94% efficiency. At 8Kw it does make a difference.

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 19, 2012, 02:24:39 pm
content: Quote from: Simon on August 19, 2012, 09:06:33 amnow you talk! how about theenglandUK flag? to hide the lack of the "liner" or "irregular texture"?electrons flow better in vacum. so a suction pump could be handy

author: Simon
author_rank: Unknown
timestamp: August 19, 2012, 02:26:52 pm
content: Quote from: Mechatrommer on August 19, 2012, 02:24:39 pmagain you are spouting incomprehensible nonsense in a poor attempt to make a double meaning joke.

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 19, 2012, 02:29:17 pm
content: sorry if i "miscomprehend" your "joke". its GIGO stuff

author: Simon
author_rank: Unknown
timestamp: August 19, 2012, 02:29:57 pm
content: I think a language barrier is part of the problem

author: Mechatrommer
author_rank: Super Contributor
timestamp: August 19, 2012, 02:34:07 pm
content: Quote from: Simon on August 19, 2012, 02:29:57 pmand geographic, culture, religion, implementation and "state of mind". some prefer skinny some prefer fatty

author: Simon
author_rank: Unknown
timestamp: August 19, 2012, 02:34:38 pm
content: quite

author: LaurenceW
author_rank: Frequent Contributor
timestamp: August 19, 2012, 10:29:46 pm
content: There are some fine products that come out of China - this is not one of those!And there's more marketing cr@p - "Modified Sine Wave" - They mean "square wave". And that means BIG trouble to many sensitive loads, at any wattage.8,000W??? MY @RSE!

author: brainwash
author_rank: Frequent Contributor
timestamp: November 13, 2012, 11:01:23 pm
content: Quote from: LaurenceW on August 19, 2012, 10:29:46 pmModified sine wave means a square wave with a 3-state output: positive, zero, negative, . It's actually much gentler on engines and similar loads than a pure square wave. There is a paper somewhere on the internet discussing the number of harmonics and how they affect various consumers.Regarding the reliability thing, well, I assume by know that it's almost rule of thumb among the users of this forum to actually 'tear down' brightly coloured stuff before plugging it in.

author: amyk
author_rank: Super Contributor
timestamp: November 14, 2012, 05:28:10 am
content: Found this amusing bit from the "10kW" inverter's page:Quote