2. I have seen my panels producing over 13 kW of power when the battery is drawing 3 kW DC power and the battery, house and car 10 kW of AC power. Victoria network plans upgrade to allow for more rooftop solar exports Aside from that, when you have high resistance lines, there is a voltage drop over their length. This applies to both single-phase and three-phase properties. Despite the low feed-in tariff you will receive it can still be worthwhile, especially if you can shift some electricity consumption to the middle of the day. Victorias CitiPower area: The Melbourne Central Business District. Note that connections off the main grid are usually far more restricted. As a single example, the Renault Kangoo ZE van (I think that it is the only battery powered cargo van currently available in Australia) has a 33kWh battery, and, To go further, Kangoo Z.E boasts a Z.E 33 (33kWh) battery, As a side issue for you, if you (like lots of people) have high voltages issue causing shutdown / throttling, I am not a big fan of the Volt-watt modes, as often these modes will also lower the voltages at which the throttling kicks in. I am a total newbie to this but I am unclear why export limiting is good? Amongst other things, AS4777.2015 has some requirements to shutdown on phase imbalance in a 3 phase setup. Zero-sum game: The rise of solar export limits, and what can be done I live in Warrnambool, Victoria. Solar connections for industry | CitiPower & Powercor 0000009573 00000 n Many Australian homes are not allowed to export more than 5 kW to the grid. Normally it makes more sense to buy a second, separate system, than to expand an existing one. Any ideas of how I can get a system that is actually going to generate enough power to charge a battery? Or, if you want a lower cost method of dealing with blackouts, you can get yourself a small generator. Thus, the question arises; if a single phase domestic rooftop photovoltaic system, involving a Goodwe GW-5000-MS inverter, and, 10kW of solar panels generating capacity, is installed (across up to three MPPTs), would the federal solar panels rebate apply to all of the 10kW of solar panels, or, to only the first 6.66 (or whatever is the exact applicable quantity) of the solar panels generating capacity? so if I was correctly explained to, then I am limited to export less than 5kW (because my existing system will never produce 3.5kW), No installer (or their salepeople) is able to explain to me how the limiter is connected/set up in the scenario where I have 2 inverters. is it 10kW AC or DC?? Of more concern is occasional spikes in consumption which go past the 5kw limit. Victorias AusNet network area: The eastern third of Victoria, not including Melbourne or French Island. After a major works program involving more than 500 different network alterations and other activities across nine key regions among the most constrained parts of the network, Powercors new solar connections export approval rate of just over 60% at the start of the year has increased to above 90%. Yes I do have Enphase micro-inverters and an Envoy gateway, though not enough sunny roof to exceed 5kW, so my interest is rather academic but real. It appears the wire from the inverter is directly connected to my main fuse for the house circuits. My sister has the same type of inverter (Goodwe) but she lives in the Estern suburbs of Victoria and she has been exporting but her Power Limit was set OFF. both said Solar Export Limiting or Zero Export. What Does it Mean? Would the gateway signal the micro inverters to shut down one at a time, or to all reduce output equally? Why on earth would I do that if I can help it. When a home is exported limited, all the power the solar inverter can produce is available for the home to use. The solar installer or customer must have sought and received pre-approval from us for the requested capacity of the generator. They did say that with future upgrades we could reapply, but I cant find a way to do this. Many NSW rural situations are limited to 3Kw export, due to the length of the transmission lines. Activities part of Powercors Solar Hotspots program carried out over three months included upgrading infrastructure, adjusting tap settings on street-level transformers, balancing voltage levels on powerlines and various tweakery at zone substations. Only residential homes with inverters of 5 kilowatts or less can receive the states. A man named Canute, proved that, centuries ago. NSWs Ausgrid Network Area: This covers East Sydney, Newcastle, and out to Merriwa. 0000029011 00000 n There are lots of variations to this theme, however. The installation of solar photovoltaic systems as well as the correct inverter settings are critical to ensuring customers get the most for their investment in this technology. Powercor wrote back with the following response:"Due to the size of t . embedded generation system to the CitiPower and Powercor low voltage networks. Real names are preferred - you should be happy to put your name to your comments.2. Also, if you are on the main grid the amount of power you are allowed to export can still be below the limits given or even zero, depending on how much additional solar capacity the local grid can handle at your location. And, if a street full of these, plugs their cars into the grid, for recharging, starting the recharging between 1700 and 1800, lots of entertaining fireworks, along the street powerlines exploding. But you probably would not recover the cost of the battery within its lifetime. But a sub optimally configured grid sometimes forces installers into implementing setting that are probably less than ideal if the high voltage events in the grid were just occasions where there is too much generation and they do want have all generators throttle back to allow some time for rebalancing supply and demand. Whats the logical and practical way forward? But this is at least partially because when you throttle back output, you also reduce the amount of voltage rise you are causing on your local connection to the point of interconnect which is probably contributing to the issue. If your pumping needs are large enough this can pay for itself, but it will be expensive to set up. I could not convince him that I knew what I was talking about! Thanks. It owns and operates the states largest electricity distribution network, and is responsible for more than half a million poles and over 88,000 kilometres of powerlines. 60% lagging 0000038030 00000 n Hi All, 0000017636 00000 n Powercor claims 30% increase in rooftop solar export approvals Victorian network service provider Powercor claims a major works program designed to alleviate grid congestion in areas of high rooftop solar PV penetration has boosted the approval rate for new solar connections to export excess energy to the grid by an impressive 30%. Victorias United Energy Network Area: A large chunk of Melbourne on the east side Port Phillip Bay and the Bayside Peninsula. Im surprised this hasnt hit the mainstream media yet. But there will often be times when the solar system will produce more power than can be exported, so some energy will be lost3. This means you tend to see panels at the end of strings shutdown soonest on voltage risk conditions, as they have the highest voltage rise being at the end of the string. If your solar company provides you with the Solar pre-approval (SPA) number for your pre-approval, we can check specifically what was decided on with regards to exporting. No matter how badly you may want to export limit your solar system, it can only be done in locations where its permitted. Interesting article. Is there anything that can be done about it? . So, I am pretty much left in the dark about whether all the energy my panels are theoretically producing is being utilised, or (which is my fearful assumption) up to 1.6kW are wasted whenever the panels produce more than 5kW AC. But still the solar companies keep trying to sell it to me.. We want to add a battery and it seems logical to add more cells also to another inverter/battery setup. Have a good christmas. This is done for three main reasons: In this article, Ill give a broad outline of how export limiting works and why it can be a good idea. Similarly, which would be more detrimental to a fragile electricity grid, through power exporting; a 5kW inverter with no export limiting, or, a 10kW inverter, with export limiting set to 1kW? In my mind though the Smart meter at the box would adjust the export limit in line with what the house is consuming? Powercor will respond in one of three ways: Approve the size system you've requested Limit the amount of power you can export to the grid (e.g. A Decent Battery From sonnen. The MSO helps us manage and keep our network safe for solar customers. The new home didnt have solar. We are in an area where only about 20% of the homes have solar. going back into the grid with no batteries. Shane, you appear to be mixing up kW and kWh easily done! At times MPPT1 is at 600 odd watts while MPPT2 is at 2500 odd watts. Powercor's technical assessment aims for these works to enable at least 80% of new solar applications to export 5 kW. It is just the placement of the meter and the current sensor that controls the limiting. The solar PV system is connected to the network via an inverter. Exporting surplus solar power is good because it reduces fossil fuel generation and pays you a feed-in tariff that reduces electricity bills. Sometimes Powercor can reduce that to a lower figure, or even set a zero-export limit. If they want a big solar system with an inverter larger than 5 kW, they must export limit the inverter. We do not prevent customers from installing solar for their own self-consumption. VAr (var % rated VA) If you are export limited, the only way to implement that is with some sort of meter as Ronald says. Larger inverters that are export limited are allowed on a case by case basis. So, the whole of the system of restrictions and available components, for domestic rooftop photovoltaic systems, needs to be reviewed, to provide for greater usage demands during peak demand hours, greater battery storage provisions (and financial assistance for householders to implement big behind the meter battery storage systems, and, regarding the fragile, decrepit SWIS grid, the allowance of large capacities of panel generation, limited export, inverters, such as the hybrid one that I proposed. The new inverter standard AS/NZS 4777.2:2020 has new inclusions to address grid stability issues - a new feature that is necessary to further enhance the hosting capacity to accommodate more solar and renewable energy systems. We just applied for pre-approval from Powercor and were given a 0kW export approval which is going to make almost anything we choose uneconomical. I have an existing 3.5kW PV system with Solis inverter. PDF Installation and connection - Powercor Origin offers 8 cents per kWh until a daily export limit of 14 kWh is reached. MPPT2 always shows better performance than MPPT, usually quite significantly better. I realise that Australian legislatures do not care about the future, but, the future is coming, whether the legislatures like it or not. I was always of the belief that a 5kW inverter limited the total output/ production from my 6.5kW solar system to 5 kW, irrespective of what is being used in the house. So if an inverter that is export limited to 5 kilowatts is providing 8 kilowatts of power, none of it will go to waste provided the home is consuming at least 3 kilowatts at the time. Voltage (V) measured at inverter terminals Put down your weapons.3. 0000007554 00000 n But if people send a lot of power into the line then the voltage at the far end, instead of being lower than at the sending end, becomes higher. For example, I can see several Energex profiles that do things like limit export to differing amounts, turns on Volt-var without Volt-watt, or sets the power factor to 0.9. No unfortunately. I am afraid Western Power is very strict. In exchange, the customer receives a small rebate on their bill for every kilowatt-hour (kWh) they export. I have noticed that one string seems to be performing well under the performance of the slightly smaller string. 1. I know in the movie the Bad was worse than the Ugly, but thats not the way Im doing it. What Happens to the Surplus Power That Can't Be Exported to the Grid? 0000000016 00000 n If you are using Enphase microinverters which is extremely likely the whole system can be export limited using the Enphase Envoy gateway. trailer So what goes throgh the meter, in either direction, is the difference between what you generate and what you use. I installed 6.6kw solar panels and have Goodwe 5kw inverter and applied for export limit of 5kw. To me it does not quite make sense as no system can produce 100% of its capacity meaning my existing 3.5kW will never produce full 3.5kW (on a good day, I am lucky to get 2.5kW). On the main grid, single-phase properties can have 5 kilowatts of solar inverter capacity, and three-phase properties can have 15 kilowatts. Finally! Off the main grid, rural properties can have 3 kilowatts of inverter capacity. They want to do it there way and it seems my request complicates things for them and I dont hear back, bar a couple. My question is should that then eliminate the 5 kw inverter of the powerwall wich Energex claims is part of the 10kw allowance on a single phase? Victorias Powercor area: Western Victoria, including a large portion of West Melbourne. I realise that all the political parties in the the WA state parliament and especially, the Synergy/Western Power conglomerate, that controls approvals of domestic rooftop photovoltaic systems connected to the SWIS grid, are opposed to domestic rooftop photovoltaic systems (even though we stabilise and sustain the grid), but, I am wondering whether any reason has ever been given by the oppressive authorities, for banning export limited inverters in WA. Power failure: Homes hit by solar limits as distributors protect The Solar installer is telling me that they just started getting 0kW approvals back for about 9 out of 10 requests and so they dont believe they will be able to do many installs at all going forward. 0000005986 00000 n Finally! Assume positive intention.4. With permission export limiting can be used to install larger systems. Upgrading the local electricity network so more businesses and households can export excess solar to share. The uptake of solar has surprised the powers that be so they are basically wasting free energy and penalizing the producers in the process. Voltage (V) measured at inverter terminals Youll also start receiving the SolarQuotes weekly newsletter, keeping you up to date on all the latest developments on Australias solar scene. 260 100 litres alone means little, but if there are 100 litres per hour, this means 100 litre hours of output. Export limiting generally isnt permitted. 0000037380 00000 n I have previously posted (or, submitted for posting), the proposition that what is needed, is a hybrid (not meaning in this instance, a hybrid inverter as is commonly used) inverter that is like a cross/combination, of the Goodwe GW5000-MS inverter (or, kind of, the GW10K-MS, in terms of power conversion), and the Goodwe GW5048D-ES; three GW5000-MS provides for up to 10kW of panels generating capacity, across three MPPTs (strings?
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