are panels safe when just sitting on a roof turned off

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Re: are panels safe when just sitting on a roof turned off

Postby davidg » Mon Apr 30, 2018 11:43 pm

confused wrote:the power company blames it on the panels they feel the panels are coming on at night not sure how that works with no sun.

It doesn't period, anyone saying otherwise is so full of it and does not know anything about solar generation, period.

confused wrote:or all these incidents occur during other issues such as the prison power outage thats on another power grid again not sure how that works.
There all interconnected at some level what happens one place could have an effect in another.

confused wrote:one theory i have been given is that the power company infrastructure is outdated and had so many repairs/ splices that its just not working properly
possible, but unlikely to be your root cause.

confused wrote:whole thing is odd because although some others on this grid have had issues none as extensive as us and we are the last house on the leg of the grid you would think others would have the issues.

You appear to have a substantially sized system, one thing that is required to be taken into account in Aus is wire size (wire section area for us that is in mm2) both on the property and the supply cable sizing. If the installers of your system have not or did not consider this at the time then you may windup with excessive voltage rise when the system is running and depending how much power is being exported at any moment. Assuming that it is only your on property wiring that is the issue and that voltage rise is the key issue then, certain sections of wiring on your property would need to be upgraded to heavier sectional area sizes to combat the voltage rise, the bigger the system the more likely this may need to done. Simply installing a large system without doing this sort of due diligence could cause issues. Solar itself is a proven and viable option for people to do, but like anything it must be done properly.

People that have no clue like apparently some of your power company contacts simply obscure or cause more issues rather than working where they can be resolved and how to do it correctly.

Keep in mind they have NO responsibility for your private property wiring infrastructure. Power companies responsibility generally end at a specific point. It might be the "primary" main supply fuse/s, it maybe the meter or somewhere else, regardless after that point it becomes entirely your problem as the owner of the site/property. that means you have to either workout what is required to resolve on site issues or you need someone that can work it out for you and provide a solution to eliminate any possible onsite issues with wiring. If issues continue after that then it often becomes clear it's the power company that is at fault and definitely not your onsite system and wiring in which case they are then obligated to resolve their infrastructure issue for you, which maybe voltage drop rise so that it complies with local regulations and standards.

I was in the US at the beginning of this year for several weeks, I had a look at some of the wiring that was easy to see (furnace rooms) it was frankly rubbish, we sometimes think wiring in Aus is not great and I've some horrible wiring here although it generally was done illegally, but generally ours beats the hell out of the stuff I saw. The wiring I that saw was apparently approved was just garbage as far as I was concerned, often for the current that would have been passing through it far too small, which causes voltage drops far greater than ideal, likewise if used for Solar generation it would more than likely cause excessive voltage rise as well, works both ways. As the US has a considerably lower operating voltage compared to Aus the current involved becomes a real issue as the cable sizing (cross sectional area) needs to be much greater compared to ours (Aus) which is supposed to be 230VAC, so insulation requires to be better compared to the USA. In the United States and Canada, national standards specify that the nominal voltage at the source should be 120 V and allow a range of 114 V to 126 V (RMS) (−5% to +5%). This means that cable to carry to same number of watts as Australia will need a cable of APPROXIMATELY TWICE the cross-sectional area to carry the current required to deliver the same number of watts. The only way this can be done is the cable must have more cross sectional area to cater for the increased current because the voltage is also lower for a given distance the voltage drop compensation will also require a cable to potentially require an even greater cross sectional area, to ensure that voltage drop/rise is minimised, typically for Voltage rise in Aus in NSW for instance, requires to be kept to a very small percentage of 2% to 3% I think it is, without checking. I'm in Vic the rules are slightly different, but I like to see no more than 1% to 2% voltage rise from the inverter/s to meter and I don't need to, but it's still very handy to know exactly what's going on for an installation, I consider this part of good design.
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