The Ugly: In these areas export limiting may not be allowed at all. I think of it like the rate at which water is flowing out of a hose. We installed solar power in November last year and were refused export (zero export). The majority of customers are approved for the export level they request. South Australian solar panel owners can currently export 5 kilowatts of electricity to the grid but under Flexible Exports, they could export double that amount 10kW. Is it the 6.66 kW, as the 1.3 overload factor of a 5kW inverter, or, is it the maximum allowed (by the manufacturer) panels generating capacity, for an inverter that is allowed by a state/territory government? Regarding batteries, as we all know from our mobile phones, constantly being charged and discharged, will deteriorate much quicker than PV panels (and the same that goes for phones, laptops, and your electric toothbrush also goes for solar and electric vehicle batteries, unfortunately). 240 Now, there are quite a few profiles on offer that can be programmed into the microinverters. 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. But given average voltages are probably well above what they should be in lots of places, and once you factor in your local voltage rise, and pretty low values under AS4777 etc, there is not much room to play with until the distributors get the act together and deliver us power that better matches the 230v standard they are required to deliver us. To add to this, in the installer section of the Envoys web server control panel, you can set the profile by which all microinverters operate. It also allows you to focus on increasing your self consumption which in turn provides a better return on investment. Enter your postcode now. 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, Powercor's new solar connections export approval rate of just over 60% at the start of the year has increased to above 90%. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Download the first chapter of The Good Solar Guide, authored by SolarQuotes founder Finn Peacock, FREE! Assume positive intention.4. Ronald was born more years ago than he can remember. Efficiency has and will improve further over time, but never to the point of perpetuity. After (almost) three months with no reply, has any reason been given, as to why export limited inverters are not allowed for single phase grid connections to the SWIS grid in WA? Depending on their location, some may be constrained to a lesser export level or even no exports at all. It is just the placement of the meter and the current sensor that controls the limiting. First read the section How Export Limiting Works at the top of this thread. 0000008571 00000 n
driving range of 200km depending on ambient temperature. Powercor says it has contacted all solar customers within the previously impacted areas to let them know about the companys progress and to encourage them to consider reapplying for exports. So it is unfortunate that it is necessary, but good that people can still install a larger system and generally have insignificant losses. Victorias AusNet network area: The eastern third of Victoria, not including Melbourne or French Island. I still dont know if they have programmed the inverter to reduce the overall output by a percentage or not. I think is is utter madness that the VIC government is handing out generous rebates of $1850.00 and 4 year interest free loans of up to $1850.00 and Powercor has zero feed in capacity for excess solar power. There may well be a tipping point in battery prices where a drought of mid day solar will be followed by very little evening use and possibly large numbers of households abandoning the grid altogether. Energex doesnt automatically allow inverters over 5 kilowatts to be installed with export limiting, but currently regularly grants permission for single-phase homes on the main grid to install up to 10 kilowatts of inverter capacity with export limiting. He first became interested in environmental matters when he was four years old after the environment tried to kill him by smashing fist sized hailstones through the roof of his parents Toowoomba home. Because you dont see the rather obvious shutdowns (or see them less), you might not notice your solar might be throttled back on a regular basis. All these profiles need to dance carefully around the problem. "Some of these customers may have received approval to export since, due to network improvements made since their connection." No-one seems to have replied Dirk, so I will try. I am surprised to hear that Powercor has allowed you to increase your exports, but that is good to hear. I have spoken to one installer , but he couldnt really help me . It is delivering 8 kilowatts of solar power. Or, if you want a lower cost method of dealing with blackouts, you can get yourself a small generator. I think the installers like the Volt-watt modes, because if you dont know where to look they hid the problem at your expense anyway. Up until quite recently, Powercor had been informing a large proportion of households looking to install new solar systems they will have to cop a zero export limit due to high congestion created by exports from existing systems. The fact is that Powercor does not set an upper limit on the size solar panel system you can install, up to 30kW. The reason why your sisters inverter is different from yours is your Goodwe would be because yours has a current transformer device that lets it limit the amount of power it exports to the grid. I cant justify the cost of adding additional solar if the max I can export with Essential energy is 3kwh. Export limiting does limit the inverter output, but only as needed to keep the export power below the limit. Can one have micro-inverter panels without a gateway, and how would that be limited? As your sister can presumably export as much power as her solar inverter can produce it wouldnt need this device. When an inverter is export limited, it has to know how much solar energy is being sent into the grid so it can immediately reduce output if its about to go over the limit. We might still be willing to do this all the same, from an environmental viewpoint. Even then, the losses from the limit are minor. The Good: In these locations, properties can usually install up to 10 kilowatts of solar inverter capacity if they have single-phase power and up to 30 kilowatts with 3 phase power. Can I share my power excess with me neighbour? That is correct. Exporting surplus solar power is good because it reduces fossil fuel generation and pays you a feed-in tariff that reduces electricity bills. Quotes vary and the deal has to be value/advantage logical or whats the point. If you are in the solar industry - try to get to the truth, not the sale.5. Its also unusual for a large solar system to have all the panels facing the same direction. 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. Thanks so much, David. is there a inverter that stops power going back Im afraid thats a tough situation. So while the article suggests 10kW inverter ( 13.33kW DC) in fact the limit seemed to be 10kW DC ( hmmm what does 10kW generation mean exactly ?.) 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. In my case, I have N & W facing panels, My inverters clip to 5Kw for a few hours, but I can still export a reasonable amount. Were seeing a real lift in the number of customers able to export excess solar back into the grid in these areas, which were among the most constrained in our network only a few months ago, said Powercor General Manager Electricity Networks, Mark Clarke. Of more concern is occasional spikes in consumption which go past the 5kw limit. Powercor wrote back with the following response:"Due to the size of t . Or is there a build up of voltage in the system? 0% Still, few people will want more than the 13.33 kilowatts of panel capacity single phase homes can generally install: The Bad: Homes with single-phase power on the main grid can have up to 5 kilowatts of inverter capacity but can usually get around this limit by installing an export limited solar inverter of up to 10 kilowatts. Still a very long payback period, but not as long. 260 Its becoming common for solar inverters to be export limited, so the maximum amount of power they send into the grid is less than theyre capable of providing. Limited export means more power for home If your system has a limit on how much it can export then it means more power will get used in your home instead. This is often referred to as 'network constraints'. I want about 10Kw of panels so I can run pumps etc. I just dont understand it. Thanks Ron. While I dont know where you are a 4 kilowatt solar system should produce an average of around 18 kilowatt-hours a day in WA. Whilst this may not be technically defined as export limiting, as the inverter specifications, specify that the inverter, whilst allowing up to an overload factor of 2, will only generate up to 5kW of A/C power But there will often be times when the solar system will produce more power than can be exported, so some energy will be lost3. The naming of zones may differ between manufacturers but may appear as: Australia A - applies to the configuration of inverter settings in Victoria and all Eastern . 3. About CitiPower and Powercor FACT SHEET: SOLAR EXPORT APPROVAL Set appliances to use your solar power Maintenance and safety checks are important See image at http://www.johnrogers.com.au/battery_charging_noon.jpg, CORRECTION: My 13.25 kW system will not go above the 10 kW inverter limit unless my house battery is charging and then it can go to 13.25 kW. Hi But if you had a larger solar system with a larger inverter that was export limited to 5 kilowatts it could potentially supply 2 kilowatts to your home while exporting 5 kilowatts to the grid. If you are interested you can read about this here: https://www.solarquotes.com.au/inverters/mppt/. We respect your privacy and you can opt out from the newsletter at any time. There are exceptions for off-grid installations and systems that are installed with a battery. I was told to set Power Limit to ON. In reality, the losses will be considerably less. NSWs Essential Energy area: Regional NSW. In exchange, the customer receives a small rebate on their bill for every kilowatt-hour (kWh) they export. Even if you have the Envoy-S, I believe at least on paper there was a Enphase Envoy-S It would definitely be better if we didnt need to limit the amount of power solar systems sent into the grid. What am I missing? I was lucky to have an early approval, so limited to 10Kw (or due to bad calculation by the approver, 8.6Kw, where he said ALL the Neutral current went down the common Neutral wire, where in fact only the difference between the phases goes down the Neutral (2 phase, 180 degree). Victorias United Energy Network Area: A large chunk of Melbourne on the east side Port Phillip Bay and the Bayside Peninsula. I think that the limiter can connect only to one inverter and not two at the same time. Victorias CitiPower area: The Melbourne Central Business District. And Set Power Limit to 100%. 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. Under another option to . Im on a swer line in rural south Australia. Economically this probably Is not viable, as our electricity bill is fairly low. 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. Sorry if dumb question. The uptake of solar has surprised the powers that be so they are basically wasting free energy and penalizing the producers in the process. The solar PV system is connected to the network via an inverter. Upgrading the local electricity network so more businesses and households can export excess solar to share. startxref
If thats not a good option, you can consider getting a demand tariff and doing pumping outside the peak period when the cost of grid electricity will be relatively low. If you are export limited, the only way to implement that is with some sort of meter as Ronald says. Your dedicated meter will inform the inverter, and it will immediately reduce the power, so it doesnt exceed 5 kilowatts1. If at any moment in time you are generating more solar electricity than you need, the excess is exported to the grid.
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