There are many opinions and myths around the fire and electrical safety with regard to the installation of solar modules and inverters. We have here supposed to sort out a number of Those points Concerning this topic. We will divide it into Several mindset where we bothering will DISCUSS what happens When the fire is a fact and We Should, of course, talk about what You should do to right the Solar will not be the equipment That is the reason why a fire.
What we work with the kind of power.
As most know, is a solar energy system and the power to laborer in the photovoltaic something called DC. DC is the same voltage as you have a battery, but in this case it is much higher. DC is a translation of the power to work with in a normal welding so then you understand how easy it is to create a spark and / or arc voltage of the solar system can be up to 1000 V, and the voltage can create an arc, Which is A few hundred mm of Air and moisture have the right conditions. To damage on DC from a solar energy system must be taken into bothering the + and - and in the same loop of the inverter is not running. If the inverter is running orif the DC switch is of simple model That only breaks +, you get power in the taking of a + and optional - cabling. What I would say Is that bothering the + and - cables if one is injured by a photovoltaic system. DC current in a solar energy system slikjer, however, from That of a car when in a solar energy system does not use the negative side of the earth, but it is a fully integrated / closed Systems Which means you do not soil by standing on The ground / ceiling but to get a power, then connect to the Active loop. This is different from what we are accustomed to AC power Which is enough to come to a stage to get a good bang. thisBecause the AC current soils in the countryside so basically says you're Already on the negative as soon as you touch the ground. In short, it takes a lot to get a shock than the other way around, most people would not succeed even if They tried. However, one Should always be careful Because if you get a shock, it can make Substantial pain and have been unlucky, you can damage properly.
How can a fire start in a solar energy system.
Yes, there are basically only two Reasons for a fire starts in a solar energy systems and one is a loose connection or bad contact where you get a rush and arc then Increase in size heats alt Because the material is burned into the arc. This happens Because of bad connections and substandard junction boxes. Usually we suggest That You should have as little connections and interruptions as possible between modules and inverters, and You should never use screw connections where the quality of the connection Depend on how accurate electrician or installer ice. We suggest you use connectors with crimp That Require tools for installation to minimize the risk of a poor connection or connectionsWith an integral clamp coupling. A screwed cable is a very common fire hazards in the electrical system, and such a link makes high Demands on the assembler. When it comes to junction boxes in the modules, we Usually recommend That you have completely Soldered or welded connections in the box, unfortunately Producers for cost Reasons stopped solder and weld boxes and relies then only the usual spring secured connections Which we believe are substandard. All These boxes are aproved by Organic nissa organizations such as TUV, but:: According to our experience and our tests Maintains They are not measurements. TheseRunning-set connections are overpriced tempered by years of heat and Will Eventually lose much of its spring effect, and then the connections to drop and a loose contact ice Then the resultant of the Fire That followed. The second reason that a fire starts in a solar energy system is substandard materials in the module or a sloppy production or a freight damage to the module, These problems tend to reveal themeselves into That you get a short circuit in a silicon plate, Which we hotspot call. These will create a temperature peak in the module and with a little luck you will not only lose output, but overpriced start a fire. A hot spot can reach Temperatures of Several hundred degrees and then everything char material into its vicinity.A fire rating module Should normally be able to put out a hotspott the material Should not be flammable, however, makes it a Requirement That the module is properly installed When The temperature in the hot spot can be very high. There is only one way to check Whether a facility is 100% OK and it is to film it with a thermal camera after installation. Clearly This will show if there is any module That has suffered an injury or have a shorted cell.
Advice for the installation of solar energy systems.
- Use minimal connections and interruptions on DC wiring.
- Do not allow connections and contacts lie on the ceiling or in the rain, even if They are rated to handle it.
- Use "never" screw connections / sugar cubes or the like unless you absolutely have to, if you now still have to use screw connections so make sure the shoe strands with a sleeve and Use The connectors and screw means That are approved for DC. DC requires more insulation and higher isolation distances than AC and unfortunately this is the right material for DC These tensions quite unusual and use as material That can thwart be described as substandard. One Can Also see That separate the + and - to minimize possible internal arcing.A sugar cube in Which There is bothering the + and - coming with 100% certainty to get flash over between poles and with a great potential fire hazard.
- One Should Also keep in mind That ordinary relays and switches "do not" work for DC since it requires incredibly large contact separation to Manage the voltage of a PV system. Use inverters with integrated isolator or ENSURE That the switch is designed for DC and 1000V voltage. The power depends on the number of loops, the switch will be different from.
- Protect the wiring with Rodent When passing through combustible walls, this is not enough plastic tubing but Should be steel pipe or steel tubing.
- Always try to use metal cabinet where you must break a harness, this minimizes the risk of fire omgnistbildning would take place in the cabinet or a clutch.
Use minimal connections and interruptions on DC wiring.
• Do not allow connections and contacts lie on the ceiling or in the rain, even if They are rated to handle it. • Use "never" screw connections / sugar cubes or the like unless you absolutely have to, if you now still have to use screw connections so make sure the shoe strands with a sleeve and Use The connectors and screw means That are approved for DC. DC requires more insulation and higher isolation distances than AC and unfortunately this is the right material for DC These tensions quite unusual and use as material That can thwart be described as substandard. One Can Also see That separate the + and - to minimize possible internal arcing.A sugar cube in Which There is bothering the + and - coming with 100% certainty to get flash over betweenpoles and with a great potential fire hazard. • One Should Also keep in mind That ordinary relays and switches "do not" work for DC since it requires incredibly large contact separation to Manage the voltage of a PV system. Use inverters with integrated isolator or ENSURE That the switch is designed for DC and 1000V voltage. The power depends on the number of loops, the switch will be different from. • Protect the wiring with Rodent When passing through combustible walls, this is not enough plastic tubing but Should be steel pipe or steel tubing. •Always try to use metal cabinet where you must break a harness, this minimizes the risk of fire omgnistbildning would take place in the cabinet or a clutch.
If and When the fire is a fact.
Now it is unfortunately So THAT Fires Occur although it probably is rarely a solar energy system is the cause. So what You Should Consider to give them to extinguish such a safe living as possible. Here, there are many myths and various proposals only Improves on the invoice to the person who Shall act anläggen, and the only thing many of These proposals do is create a false sense of security as we all know, is more dangerous than doing nothing. I'm here to talk about somethings That vendors of photovoltaic systems tend to take up the quest to win a customer.
Fire protection switch:
This is a switch That seat on the roof where all DC wiring passes. This is thought to be able to switch off from the ground before making a
quenching operation, it May be connected to the electricity grid or fire alarms to break or call the voltage between modules and inverters. This switch is a sensitive
component thatwill containe the relay Which will break at least 1000V and 15A, Which is a tough task. It will Require a lot of quality to be able to break all
loops without the break and this will be the clear after sitting up there for many many years, and it will of course overpriced cope with High Temperatures
Because it naturally burns at the time That it wont work. We at Sunshinepro see this product as a fairly useless box developed to serve
Money Authority fear and to fleece customers in another few thousand. We're guessing That if it starts a fire somewhere in this facility so
is the probability That it wont start in this box which of course is comical in this context. What we wrote in the previous paragraph That You should avoid
clutches and have as few links between modules and inverters as possible has been the overlooked this box. If you want to remove the risk of live cabling
between ceiling wiring cabinets, there are two much safer and cheaper alternative. either you put the inverter on the roof or in connection with the roof, this will then ask
There Will Be no DC cables anywhere else than right on the roof. Other option is to pull the wire harness + and - wiring separated from the modules
inverter, this means a fireman That can never reach Both the + and - if he has to go through a wall or the like, and then a firefighter is not injured by These
cabling.
Optimizers / Smartbox:
This is a little electronic box plastic / ALU you put behind each module to have full control of the panel and to control panel and on, this box willalso be Able to Manage shadows on individual modules Which internally in the box brings the excitement Out From The module to Compensate for a voltage internally in the module and then so as to hold the loop in the same voltage level. Often it is very beautiful results and have good control of the modules in a loop, unfortunately, give this little box is not better results than a standard stringoptimerare / stringinverter. Our tests have shown That the loss of energy in the year to have them installed inloop. For a normal person tossing This is quite logical. One must no more energy by installing more sources That Require energy. But if you do not have an eye on the loop to be configured, and if You have a device That has small voltage tolerances, then a smartbox Give A + results, however, it does not exist in a reputable fitter world. This little box there costs a lot of money and it has since compensated by building a cheaper inverter Which we think is OK. This can be seen by reading the data sheets for These inverters for optimizers and compare with known brands from other manufacturers. This will allow you to seeMajor differences on the DC side in the form of much smaller machines with less Amp and much lower voltage tolerances and fewer inputs for loops mm. Often pulling it down on things approved integrated DC separator Also Which is pretty stupid. For maximum production, we Propose a traditionally configured system with good margins. In a well configured system has been installed Twice as many modules in a loop than the inverter has the lowest voltage level Which then allows you to have a number of modules shaded without losing energy in the residue of the loop, the alternative is to install solar panels where there are no shadow.One Requirement is of course That it has bypass diodes in the module and That They have the proper resistance to drop the current Furthermore the shade or cross slope in the module. Shallower a problem with optimizers Is that They sit in the modules on a roof, this naturally gives warranty exchange a whole new meaning. We know over the years That if something breaks, it is the inverter or other electronics especially if the time sitting in an inhospitable moist and warm environment. Imagine a lightning strike or other overvoltage smashes all the electronics in your 25kW system, then You should first replace your inverter and then you up on the roof and Unscrew the 100stmodules and switching 100p optimizers and I can guarantee That it is not included in the producer's commitment. Are you then worry That you can not control the module and ENSURE That They work and do Their job, it is the recommendation from us to buy modules That can be trusted. People are naturally smart and has in most cases worked out the disadvantages of optimizers, many buy them anyway for the nice graphical display and act of modules, stylish interface and rounded-made apps allows one to imagine These optimizers anyway. As the above arguments havebeen seen by the market as musts The Producers and sellers find other tracks to sell their products, ,, Which They have nowBegun to highlight a rather dangerous assumption Which Claims to solve the problem with the DC voltage in cables under fire. The loops passing an optimizer has the same voltage as a regular system, and it is just as dangerous. However, you can turn off each optimizers, thus Removing any DC voltage in the system. The man then not thought of Is that When this to work so passionate about it, and These boxes and modules are then subjected to tempera tures above 1000 degrees. I can assure all readers thatthis little plastic box with circuit boards and static relay will melt a little shapeless lump of plastic, copper and ten. Trusting thatthis boxwill hold a module off would be more than stupid. The most dangerous thing in all this is thatwith this reasoning gives the false security of firefighters, electricians and fitters which of course is much more dangerous than the alternative. Trying to make money with arguments That can harm others is something we do not like and we hope That this comes out and anticipated very soon. It is a translation note godkännda disconnectors In These products and there is a translation of no scientifically independent documentation Supporting These Assumptions, so this is the only one speaking for sellers to peddle the customers a unique brand and Should be Considered with caution.
Mikroinverter:
These machines are very similar optimizers in all functions and numbers with a difference Because They Do not Require any central inverter When the inverter function is built. Mikroinverter is the only hardware That is 99% guaranteed to remove the risk of electric shock of electricity. They are each connected to a module and even if They burn up so there will be more tension in the system than a module can deliver (about 40 VDC). Then They Wonder Why They are not the only ones on the market That Should get the figure. Yes, as usual, has everything a downside and it is a translation of true mikroinvertern. First and foremost, it is very expensive When You Have an inverter technology to each module.In larger systems, it May be three times as expensive as the alternatives. It also has Greater losses When working with low voltages and just as optimizers , it's a lot of electronics to power and operate. In addition, pull up the AC voltage on the roof Which is bothering complicated and Require a higher electrical safety, electricity outdoors is never harmless. We must start thinking about how to connect These so you get an even load on the power grid, so there are plenty of drawbacks though it would solve the problem of electricity in DC cables under fire.
What can happen When extinguishing a burning building with solar modules.
Yes, the problems of extinguishing the property with solar cells is a piece Excessive, and of course it depends on knowledge and education. Many firefighters I've Talked to receive orders not spray water Directly onto the solar cells When They Think They Can Get the power in themeselves and in some cases have arrived at different distances for different types of rays. I hear too thwart that "you" have read about the firefighters who died of Electricity in solar plants but I have not yet found any information about it so it can not hear the usual. I have read Those documents skrivets for rescue in a fire in a solar energy system, These Are Written by People withmoderate Knowledge Regarding Photovoltaic Systems and electricity and are thwart the resultant of them listening to a seller of unique fire or watched any less Scientific YouTube movie, and in many cases are not representative of the reality. I'll try to sort out some terms here That can get all readers to understand for themeselves what to do and what not to do. DC voltage is a voltage That moves from - to + and a Requirement for it to work Is that you'll have access to both ends, The Same Applies of course to get the power itself. It is thus quite different from the AC power That we have in our outlets at home, where it is enough to take the stage, you will get a good slap on the Because You then grounded.Earth in a solar energy system is isolated, it can be saidthat You have to stand on either the minus or plus the cable cord while spraying water on the modules to get a shock. So if you can not stand on the unit, you can never get power itself by squirting water on it. If you stand on the ground or in the car or on the ladder appliance so the equation surge impossible. That it May be rushing stream of water as we know, but in this case, the rush on the roof between plus and minus and has no reason to get up in your grip. Furthermore, it is each loop its own battery Which means it's not enough to take in the plus and minus to get a shock, you must take is the right and right plusminuses. However Should add That If you take the right plus and correct less so you get a good bang for the sun is strong, we talk instead about the night and the street lights so you can not Achieve any hazardous voltage or current, it is so poor efficiency on a solar module so there is no practical way to create energy in street lighting That is large enough to harm anyone who works with the modules. Then we knowthat you can measure krypströmar When all the cables going to the inverter and where They can, of course, cross-circuited to ground, thus creating a jordbas in theory, we have tried to simulate this problem by grounding the modules Directly Into The ground and measure, but the has been so little tension as we know them note When We take in the cablingbut They can be measured with instruments, So THAT we do not rule out but we can not even in good conditions to get a hazardous voltage thereof. A bath installation , alternatively, a burning roof was supposed to of course be able to get any of the poles to expose themeselves and go into the stand material or a metal roof and thus Increase the risk of getting an electric shock. However, you must then stand on the roof and probably keep the ceiling as you take on the other end. It is likely That the plant at that time alreadyloggedin shorted in more places and we all knowthat power always takes the Easiest path and you'll have shorty in the ceiling, it will choose the roof if it is in the plate.If You also reasonably fireproof gloves and rubber-coated boots in doubtthat so you can get a shock if you are not really careless. I would personally go through a wet Actively solcellstak with an ax so would my biggest concern is to get the broken glass in the face and Physically hurt me on modules, power I feel the slightest risk. I can say That my dealer withtheir technicians, amounting to Several hundred in Sweden and has installed many MW of solar cells in the rain, snow and all types of weather have linked These facilities "on the fly" has never had any impact what I overheard . In myself have installed aNumber of MW in all weather conditions and has never had any impact, and this depends on That One never Manages two cables Simultaneously. Unfortunately, you've've become a little used to this and will Manage the AC in the same way, but Usually When to Ask Reminded That it does not work When you get a hit. If you turn off power to a building or switching off the DC Disconnector (DC switch) to the Sun's then remove the load on all solar panels and has found broken loop where the current can wander between + and -, at this point it is safe to go out in the flat and cut the cables and goat through a module even if you cut the wiring and takes into bothering the cut ends, so you will not get any excitement in you When the loop is broken.Would you cut in two places inTrail and take in the right cables, you will only get the amount of electricity thatwill be in the number of series connected modules between These cut-off places. In short, we can say That with DC disconnect switch off as you work very safe out on a solar energy system, both on land and on roofs.
Summary.
One can now interpret the page as if it is harmless in solar cells and solar cabling, it is absolutely not and You should of course always think before you make a bet, you handle it carelessly and errors can cost lives. But if you have a strategy and a little logic, you can handle this power without any great endangerment. However, it requires knowledge and to be able to respond quickly and effectively in real time, and it must function in a PV system präntas into the spinal cord in the same way as everything else to do quickly and well. This We Can Sunshinepro help with. It's Very Important That a firefighter can do Their jobs without concern to make an effort to save lives. Ignorance will not stand in the way of this.We have courses for dealers, fitters, electricians and consultants, and has now overpriced started to help firefighters to think right at stake. Do you want an education on solar power so you just have to hear from the Sunshinepro. Of course, do not we earn money on security as These programs cost nothing, just to make an appointment so run we.
