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Forum Index : Electronics : Question on Grid Connect Invertor
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Guys Thanks Pete for the heads up. The problem was the "quote" was in lower case, needs to be upper case QUOTE. Also a QUOTE tag embedded in a CODE tag was also upsetting the formatting, as the engine will still search for the [ QUOTE ] tags and not realise its within a [ CODE ] tag. As to why there isn't a QUOTE button in the formatting options, good question, I dont see why not, so I'll look into adding it. This forum software, Web Wiz, is getting a bit old now, but its been modified so much thats its no longer possible to update it with a later version of Web Wiz. This means nice formatting features found on some forums are not available here, but this is a very secure forum and has a few nice features that I've added, like the image handling functions. So for the future I'll have to stick with this system and fix the occasional little bug that pops up. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Actually, I'm wrong, quote and other tags can be in lower case. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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Downwind Guru  Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
[quote]The basic issue is one of timing, if you could delay the light returning for a few hours I think you'd be onto something. [/quote] The theory was the light would travel upwards at the speed of light and fall back down at the speed of gravity, hence giving a time delay. 
I still have a feeling there is a bug in the theory somewhere. 
Pete. Sometimes it just works |
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graynomad Senior Member  Joined: 21/07/2010 Location: AustraliaPosts: 122 |
[quote=MOBI]I have a "copy paste" text file on the desktop that I use for bank passwords etc and now for the quote functions. A lot quicker than typing all the quote business as it is mouse only. [/quote]Good idea. I know someone who has an Arduino rigged up as a keyboard, it has 16 pushbuttons and each one spits pre-canned forum phrases up the spout. You'll note I tried the quote= trick as well, a man's never too old to learn a new trick. Glenn, thanks for sorting that out. It was looking a little wierd there for a while. My personal forum software favourite is SMF, but I can't imagine how you would migrate this to another product. Still there's no real need, this works OK and if you can play with the code even better. Pete, I'll have to get back to you on that, I too feel there's a gotcha in the details. ______ Rob Rob Gray, AKA the Graynomad, www.robgray.com |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Added a Quote button... 
Its only a basic quote function, and doesn't include the member name add on. Yeah if I were to change forum software I would go for SMF, it has a good reputation. But I've seen the problems other forums have had migrating to a new forum software system, stuff gets lost. Also Google has indexed this forum well, and there are many external links that point to posts in this forum, all those links would be broken if I changed forum software. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
Speed of light is relative, this means it wont work because it's mothers family hates you and it gets jealous when you and gravity are having fun together. Sheese, do I have to do all the heavy liftin around here   I'm confused, no wait... maybe I'm not... |
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| graynomad Senior Member Joined: 21/07/2010 Location: AustraliaPosts: 122 |
Hey, talk to Pete, it's his bright idea, I was dubious from the start, just humouring him really. ______ Rob Rob Gray, AKA the Graynomad, www.robgray.com |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
You trying to be funny? "Bright" idea Well aint Light a bitch, and bet you that she hangs out with cousin rainbow too, although rainbow is not real bright and a little bent. Pete. Sometimes it just works |
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| graynomad Senior Member Joined: 21/07/2010 Location: AustraliaPosts: 122 |
Oh God, the depth of the humour here is...well deep. I can't stand it no more. Anyone remember marcwolf? He started this thread, maybe it's time to get back OT  although I think we'd exhausted the theory and it was time to suck it and see. I'm all for a trial run, using his hardware of course.
_____ Rob Rob Gray, AKA the Graynomad, www.robgray.com |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
This is kinder hijacking this thread, but the thread has appered to died anyway. New plan to dump excess power during winter months. I picked up one of those small oil filled column room heaters from council rubbish today. A quick check on power use as well as a "if it still works test" showed it draws 4 amps on the high setting and 2 amps on the low setting. 2 amps is about 500w, and i think my system could handle that. So the plan now is to use my NEW column heater on the low setting, as its very safe to leave connected due to no hot parts that might start a fire. I just need to set up i power outlet in the lounge that has a circuit to monitor the power frequency. The plan is if the frequency goes above 50hz from the inverter then switch the heater on, wait 5 minutes and check the frequency again and if above 50hz start another 5 minute cycle. If below 51hz then turn the heater off and monitor the frequency. This should allow the batteries not to be taxed too hard, should the excess power not be excessive. As for monitoring the frequency, thats a very basic circuit using a 240v to 5v transformer and a picaxe chip using count to monitor the frequency over 1 second. Pete. Sometimes it just works |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
I must be missing something with that inverter frequency thing. Is this specific to grid connect inverters? My inverters are stand alone and last I checked they sit on 50Hz all the time. I can understand the frequency changing with load change on rotary generating machinery but solid state inverters?? Never too old to learn something new. Klaus |
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| yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
Grid connected inverters are supposed to have 3 different ways to test for mains power quality. I don't remember the others but one is to push against the frequency of the mains supply and see if it moves. If the inverter can move the freq it should fault code and shut down. Some inverters in the past have skirted very close to being non-compiant in this area. Maybe SMA have set their islanding system up to mimic a loaded generator working on the governor. I notice when I have had the data logger on the mains supply here that the Hz wander up and down during the day (from the power station), you can actually see when they wind the wick up to meet the afternoon demand. I'm confused, no wait... maybe I'm not... |
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| Downwind Guru Joined: 09/09/2009 Location: AustraliaPosts: 2333 |
As i had stated some posts back i have a off grid system that is made up of a SMA Sonny Island inverter charger and a SMA Sonny Boy inverter reprogrammed for off grid, the Sonny Boy feeds from the solar panels to the house supply, the Sonny Island also feeds to the house supply. The Sonny Island monitors and controls the sonny boy and tells it to back off its power by increasing the frequency to 52hz, if supply is greater than demand. Its all a very neat system, and i can add as many sonny boys as i need and they are all controlled together by frequency. So if solar supply is greater than demand the system regulates to match demand, by me monitoring the line frequency i can tell if the system has backed off, this then allows me to increase load should i desire to dump the excess power into heating. Sometimes it just works |
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| Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Thanks for explaining that yahoo2, so its a grid connect inverter thing. I always thought my off grid system was complicated enough but apparently Downwind's system beats this hands down  .
My house runs about 80% off grid at the moment, power supplied from solar charged battery bank feeds 2 inverters. The solar input is simply regulated by a MPPT charger which matches daytime demand very well all by itself. Excess solar power is available most sunny afternoons but its simply not used in my case. The 20% on grid house power is on a separate wiring and feeds loads that are too great for my inverters. The last power bill was 1 unit per day on average, down from over 6 units before the stand alone system installation - its a small household .Klaus |
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