Talk:Photovoltaic system

message: Lots of improvements needed, hope there's an engineer out there who can help.  Needs a merge with Array Oldboltonian (talk) 00:08, 10 February 2008 (UTC)
thread_title:  Merger discussion 

message: In California at least, utilities are required to offer time-of-use (TOU) net metering for residential solar systems in order to allow people to run the meter backwards and reduce their electric bill at different rates during on-peak and off-peak times (usually noon to 6PM). Obviously this is great because the sun shines brightest generally during on-peak hours (which is also why people use AC more during those hours). Given this situation, if I am designing a system I need to ask myself whether I just want to zero out my cost, or whether I want to zero out my usage (annual Kwh used). Without TOU metering these would be the same, but with TOU metering they are not. If I turn off loads during on-peak times, all my generation can be used to reverse the meter at a high $/Kwh rate (on-peak rate) thus reducing my bill to zero even though I may still be a net consumer of electricity. The other thing that plays into this decision is the fact that if I were to zero out my total usage, while being careful about on-peak usage, I would end up with a net dollar credit. I have heard that PG&E is not required to pay this in check form, rather is allowed to simply give a credit on account at the end of each "true-up" period (usually every six months). This credit can build and build but you never get paid in actual money. This all leads me to think that when sizing my system I should do it in such a way that I zero out my dollars instead of my Kwhs. Of course the sizing calculations for this will have many more variables to consider, such as my expected on-peak and off-peak usage, the cost differential between on and off-peak Kwh, insolation as a function of time of day, etc. A quick calculation shows that the system size will be about 3/4 of the size it would need to be to offset usage. That's a lot. Any thoughts that might help? Is this a topic that should be elaborated in the main article here? Ric Barline (talk) 21:33, 10 March 2011 (UTC)
thread_title:  TOU net-metering: offset total cost, or offset total usage? 

message: The current article has a section titled "Hybrid Systems" and this refers to systems that include both PV and some form of electrical energy storage or Combined Heat and Power System. But there is another type of system that also is termed "Hybrid", namely PV panels that are designed to produce both electricity and thermal energy in the form of hot working fluid that keeps the panel cool while extracting heat into a tank for other uses. There is significant development going on, especially in Germany (e.g. Solar Zentrum Algau ), and at some point very soon these types of panels will begin to penetrate the U.S. market. My point in bringing this up is that I think someone needs to include a section on this in the main article.Ric Barline (talk) 17:56, 16 March 2011 (UTC)
replies: text: You know what to do! Find a ref, write it up! YouTube videos are not good references, though. Is there some literature you could cite? --Wtshymanski (talk) 14:46, 2 April 2011 (UTC)
thread_title:  Hybrid PV-Thermal Systems 

message: I propose to merge Solar photovoltaic monitoring and Solar performance monitor into this article as monitoring is a part of the photovoltaic system's performance. Beagel (talk) 14:44, 3 August 2011 (UTC)
replies: text: Go for it.  They are both little more than ad-talk and could be boiled down to a paragraph or less. --Wtshymanski (talk) 15:30, 3 August 2011 (UTC)
replies: text: I agree with your assessment. However, I am not expert in this field, so maybe you could take a care of merging these articles if there will be consensus for this. Beagel (talk) 19:54, 3 August 2011 (UTC)

text: Agreed --FNQ (talk) 01:07, 4 August 2011 (UTC)
replies: text: Done...a while ago.  Remember to identify source articles in edit comments for GFDL compatibility, otherwise you'll get stomped. --Wtshymanski (talk) 21:55, 3 April 2012 (UTC)
thread_title:  Merge proposal 

message: An image used in this article, , has been nominated for speedy deletion at Wikimedia Commons for the following reason: Copyright violations 
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thread_title: File:Rtone.png Nominated for speedy Deletion

message: This myth stated with people thinking the bypass diodes on PV panels were blocking (series) diodes. The PV panel itself is dozens or even hundreds of diodes already in series to manufacture it. Another diode does nothing, isnot needed, never used and never recomended by PV panel manufacturers. Now we have diagrams showing usage of a bocking diode and text supporting this. This all has to go unless somebody can demonstrate some references to manfacturers recommending the usage of this. I have removed this erroneous information. Do not eplace it without appropriate references. 174.118.142.187 (talk) 13:32, 5 November 2012 (UTC)
replies: text: I have no reference at the moment, but I believe the requirement for blocking diodes (or not) depends on the PV cell technology, and the use to which they're put. From memory, monocrystalline cells in series and/or parallel require no external diodes as their own reverse leakage current is tiny, but this is not true of the cheaper polycrystalline ones, and even less so for amorphous cells. Having said that, it only matters if the cells or modules are connected straight to storage batteries, as the batteries can discharge through the cells overnight. If PV modules are connected to an inverter, there is no problem, as the grid will not leak through the inverter however dark it is! Maybe these two points should be confirmed via refs, and then added to the article somewhere. --Nigelj (talk) 20:59, 22 January 2013 (UTC)
replies: text:  Solar modules are comprised of a diode for each 0.5 volt output. The accumulated PiV for a module is huge and varies with the number of cells in series. This manufacturers website has instalation specs for IEC and UL rating systems at no more thn 1000 and 600V respectively. Trouble is the charts require some interpolation by tech people to determine. Fusing is recommended in series with each string of PV panels but not diodes. Added diodes would not pass NEC or CEC requirements. If a whole string shorted the fuse would simply open circuit. In a low voltage system a series diode can cause a sysem to loss as much as about 40-70% of the power. This ma be hard to understand at first but consider a 12 V system with an open circuit PV voltage of 15-16 volts and a charged battery at about 14.5 V or higher in the cold weather. Now knock out a 1 V drop for a diode. Charge drops to next to nothing. Many hobbyists are using 600V worth of series panels and letting the MPPT chop/regulate to 48Vdc. No diodes are neede as the panels are rated for it. Now to provide simple references?? Spec. sheets work for me but some think reading them is "original research". The rest is just hearsay using installers and sales people, usually. 174.118.142.187 (talk) 02:37, 26 January 2013 (UTC)
thread_title:  Blocking Diodes? 

message: I marked this file as a copyright violation, as I found the identical image in the cited ref, on its page 15, marked "Copyright © Siemens Energy & Automation 2009 - All rights reserved". I suggest making a modified version of :File:I-V Curve T.png showing representations of Vopt, Iopt and Pmax on at least one of the curves. A good first step would be to convert that image to SVG, getting rid of the step-wise pixelation in the current version, then produce the other version from that. All this is beyond my graphics ability versus time limitations at the moment, I'm afraid. --Nigelj (talk) 21:07, 22 January 2013 (UTC)
thread_title:  File:SolarCell-IVgraph3-E.PNG is a copyvio 

message: Hi, just wondering about efficiency numbers.  Under "Insolation and energy" there are some numbers without sources, then there is a heading "Module efficiency" later with slightly different sourced numbers.  Just wondering if the earlier should be removed, changed or linked to below.  I see why it is required in the earlier paragraph to calculate the expected energy per area, perhaps then the "module efficiency" heading needs to go first?  Marc  — Preceding unsigned comment added by 209.53.110.141 (talk) 22:56, 21 June 2013 (UTC)
thread_title:  Efficiency Numbers 

message: To behave like that is not ok. -- Rfassbind (talk) 16:12, 3 November 2014 (UTC)
thread_title:  No OK 

message: The content doesn't seem particularly pertinent to PV systems, it's a general table comparing some different types of batteries and energy storage systems. Unless the content is somehow keyed to some authoritative ranking of suitability to the use in a PV system, perhaps it's excessively specific.  For instance, how does the claim in the table title text "Lithium-ion batteries offer high voltages and storage densities" affect their use in PV systems? I don't think the table adds value for the reader and we'd be better off describing what matters for choosing a battery for a PV system instead of firing a bunch of parameter ranges at the reader and expecting her to figure out if "cycle life" is more important than "power density" in PV systems. Dumb lists of numbers we can get from Google - what we need is an encyclopediac overview of what numbers are important in this context. --Wtshymanski (talk) 16:15, 3 November 2014 (UTC)
thread_title: Batteries table

message: The image https://en.wikipedia.org/wiki/Photovoltaic_system#mediaviewer/File:PV-system-schematics-residential-Eng.png in the grid connection section is bad, and should be removed, replaced or edited to make it at least somewhat accurate.
The diagram shows the storage battery connected directly to the AC wiring, this is not typical or feasible.  It either has to have a charger and inverter combination in between or it could be connected to the DC side of the included inverter if it is only charged from the solar supply.  Certainly some consumer controllers may include the functions inside a box but it is incorrect to connect the DC battery to the AC side if there has been an effort to indicate an inverter from the solar to mains conversion.  It is also wasted energy to charge the battery with solar power after it has been through an inverter first, rather use a standard charging regulator to minimise losses.
Idyllic press (talk) 09:54, 3 March 2015 (UTC)
replies: text: Correct, the battery should be connected to the DC, rather than the AC side. You could ask the author to amend the diagram. In case the author is not available or I don't hear from you in the next few week, I might consider to convert the diagram to a SVG format and modify the schematic myself. Cheers, -- Rfassbind -talk  02:14, 20 March 2015 (UTC)
thread_title:  Image needs replacing or editing 

message: "produces about 95 percent of net clean renewable energy over a 30-year service lifetime"
This sentence occurs in the lead paragraphs. 95% of what? What are the numerator and denominator in this "95 percent"?  — Preceding unsigned comment added by 156.77.111.16 (talk) 16:09, 22 July 2016 (UTC)
thread_title:  95% of what? 

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thread_title:  External links modified 

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thread_title:  External links modified (January 2018) 

message: Much of the prices have changed since 2013. 
John W. Nicholson (talk) 05:20, 17 February 2018 (UTC)
thread_title:  Dated 

message: A user reverted my edits again and again. I've deleted the photo in question, because Hong Kong is not China. I've shown him a more appropriate article for that photo, but he wouldn't listen.
The article is Energy in Hong Kong.129.127.32.138 (talk) 06:16, 23 December 2019 (UTC)
replies: text: I am listening. I just disagreed. There is a difference. Hong Kong may be administered differently, but it is part of the same nation. I linked Wikipedia policy to you a few times, specifically WP:BRD. There is a related discussion at Talk:Solar power in China for interested editors. MartinezMD (talk) 06:33, 23 December 2019 (UTC)
replies: text:  That discussion is also by me. I started the discussion here and there after you told me to.129.127.32.138 (talk) 06:42, 23 December 2019 (UTC)
replies: text: On this section, all the other images used are labelled as city name, then country, eg Helsinki, Finland; Boston, United States; etc. I will revert here per my disagreement WP:BRD. I would add no one else has objected. So seek consensus with other editors' involvement. MartinezMD (talk) 17:34, 23 December 2019 (UTC)
thread_title:  Hong Kong and China 

message: — Assignment last updated by SheilaSh11 (talk) 17:18, 26 November 2022 (UTC)
thread_title: Wiki Education assignment: Research Process and Methodology - FA22 - Sect 201 - Thu

message: I suspect we should delete it because it assumes 10% capital cost but I thought in reality that would vary a lot by country Chidgk1 (talk) 18:25, 15 April 2024 (UTC)
thread_title:  Delete table in costs section?