Hybrid Inverter vs AC coupled home storage solar battery

Hybrid vs AC coupled.
(Updated to correct misleading information)
Having tested the AC Coupled Givenergy battery 5.2kwh we've now installed the new Huawei Sun 2000 hybrid inverter and Lunar 2000 DC battery 5kwh to replace the Givenergy system.
I'll discuss the user experience and performance differences in a separate video but this video discusses AC coupled vs Hybrid DC batteries. What the difference and why would you want one or the other?
Correction; AC coupled doesn't always increase export ability IF it can be soft limited by the inverter.
Solar Config:
PV all JA solar
14X280w (3.68kw Huawei hybrid )
8X300w (2.0kw Solaredge)
Myenergi Zappi 1, Eddi and Hub
Sun2000/Lunar2000 5kwh Hybrid system from Huawei
EV: Mini Cooper SE Level 2 in White Silver
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Twitter: @EVPuzzle
My recommendation for solar/battery installer:
Power Different
Hethel Engineering Centre
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[@maximc7089]

I've gotta say that this is one of the best explanation of any topic that I've seen for a long time and you have cleared up a few of my questions for me, thank you so much. Well behaved dog and love the cardigan!

[@paulgiddens2822]

Hi great video. I've got an existing 4kw system which is half on the east and half on the west which never gives out 4kw. Could I fit a new hybrid inverter with more solar panels and a battery and stem the out going to the grid to 4kw and still claim the government tarrif? Many thanks paul

[@damiendye6623]

You using solar optimisers ? If not half the panels are always holding you back

[@chrisp7839]

I am having a 5kW hybrid inverter installed, as I am adding a 10kWh Libbi battery to my existing FIT Solar array that was installed 10 years ago. The existing inverter, a “Goodwe” 3.68 kW model, is just out of Warranty, and the company that installed it has ceased trading, so a new inverter that will replace it would seem a prudent investment. As I am having a Libbi, Zappi, and Eddi installing together, and the inverter is built in with the Libbi, I believe I should be able to see the solar input ? The installer advised that with the 5kW inverter I will be able to draw more power from the battery and potentially be able to avoid drawing anything from the grid at times of high usage. It also means if later I wish to add another 5 or 10 kWh of battery modules, say, for a heat pump, the inverter will not need further upgrading, and the pain of the G99 application is behind me. Currently a 6 week wait. And apparently if you are the person who “breaks the camel’s back” so to speak, if you still want to go ahead, you have to pay the DNO for any upgrade to the local network. Seems a poor model. They surely should be levying every solar installer, so that when the network needs upgrading, the funds are there to do the work ? Or is that too simple ?

[@richardleighton822]

Great video!, I'd like to go with the G99 installation but all my local installers are putting me off. I lbegan to fill out the application myself but there are some fields I'm not sure about. Would you recommend I fill it out myself or do you know who could do it for me? Thank you.

[@EVPuzzle]

The DNO should help you themselves I would have thought otherwise find another installer they're not all after a quick easy sale

[@bloodynorahvan2203]

Thanks this has proven really useful on deciding to replace my ac coupled with hybrid

[@damiendye6623]

So for me sound like I need to hybrids. One garage and one house roof but will still need dno approval

[@dcsh78]

Yes, I believe it’s the G99 for the higher output, that’s what we have. We had the hybrid inverter install at the same time as the solar and batteries, ie it was a green field install. Its good having both strings of solar and the batteries all on the same monitoring portal, but what is needed is a way of communicating between the hybrid and other appliances that could use excess solar before it’s exported. Potentially the Givenergy API could be used for this in the future, but that would need faster data refresh rates.

[@EVPuzzle]

Thanks for confirming the G99. I don't rehearse these videos so couldn't quite remember

[@dcsh78]

@@EVPuzzle I did find that some installers wanted the reduce the number of panels that they quoted for as they didn’t seem to want to do the G99 application, seemed a bit strange. In the end we went with installers that were happy to maximise the panels installed and do the application, give more confidence they knew what they were doing. Sounds like the response time of the new battery is much better than the ~15 seconds of the Givenergy ones, which is I suppose why you are getting the behaviour of the Zappi. I presume you weren’t getting the same issue when you had the Givenergy battery as the Zappi shut off after 10 which would be before the Givenergy started discharging?

[@EVPuzzle]

Exactly yes. Good to hear you view on installers too. They're not all as good as each other, which is why Im happy to recommend Powerdifferent. We need genuine people to ensure we're getting the best we can. Eon told me I could. Only habe 14 panels. 3.68 kw yet I've comfortably got 22.

[@JesusIsLord-]

Please help. I have a 3.92kwh solar system with a SolarEdge inverter, and a solar Iboost to heat water. I would like to add a battery and have the option to add few more panels if needed. I am told I only need an inverter like Giveenergy AC3 and a battery system. I am confused. If I were to add more panels, I would need another inverter 3 in total. Could I not use a hybrid inverter and plug existing AC from solar panels (I get FIT payments) and DC from any solar panels I install later and get them to charge the battery and hot water system. Please help. Thank you.

[@EVPuzzle]

Your need to leave your Fit enrolled array as is or exit the Fit scheme. Adding AC connected battery means adding new solar separately. If you add a hybrid for the battery and new solar it'll cost more and you'll lose visibility of the new solar. Welcome to my world

[@markmilligan6616]

I have had to cancel an install with complications over DNO and existing battery, they count a battery as a generator in my area as well as the solar, SSE are very bloody minded, it makes not difference to them whether it is AC coupled our DC hybrid total PITA!

[@EVPuzzle]

Surely you can do what you like so long as you keep to their export limit. I guess this is why lots of people just ignore the DNO and do what they want regardless. Red tape. Often doesn't help like this

[@leexgx]

Bit confusing really if the hybrid inverter is limited to 16A and the hybrid inverter is Configured that the battery will never export so just don't include the battery in the DNO request (they don't need to be aware of it as its not never going and can't to export) where as an ac coupled system might export for short times (even thought that export amout be so small burst when the load disapers in the house and ac couple battery inverter backs off) witch runs into g99/100 issues

[@Nobody_Famous]

Can you charge the DC coupled batteries from the grid especially when prices are attractive, even negative?

[@EVPuzzle]

Can't guarantee all do, but Givenergy, Solis, Luxpower and Huawei do all charge from the grid if needed. Some have better interfaces to set timers or even automate to charge at the best times, some are rather basic

[@chefgav1]

@@EVPuzzle A popular choice here in Australia is the DC coupled 10.3kw battery system Alpha ESS. System has its own 4.6 kw inverter , grid connected , add 6.6kw solar panels is a total installed cost £4600 fully installed. 10 year warranty on battery, inverter and 25 years on the panels . Even the power wall 2 where I live is only about £5500 fully installed. Australia has the cheapest installed residential solar in the world.

[@chefgav1]

@@EVPuzzle 0.53 Pounds sterling a watt installed will get you a quality installed solar system here in Australia and I have even seen a 6.6 kw solar system fully installed for about £1800 here as well.

[@EVPuzzle]

It's the installation that bumps it up for sure. Scaffolding adds a few £hundred alone

[@EVPuzzle]

Wow do you have government incentives or something?

[@allananderson3232]

Great video. Which inverter (Hybrid or AC coupled) is best for retrofit to 4Kw PV system with a Feed In Tariff (FIT) including deemed export tariff? I do not want my generation meter reading to be reduced by fitting the wrong type of inverter. Thanks.

[@EVPuzzle]

Either are fine so long as you keep them seperate and not feeding into you FIT array meter. Just leave that as it is. Theres no one is better than the other as everyone's needs are different. If you have AC coupled solar and add a hybrid inverter with more solar and a battery you won't see all your solar together in one number as the hybrid will hide it when it charges the battery. If you add an AC coupled battery and more AC coupled solar the solar can be wire to see it together. Imo its all about the data and the apps. Hybrid is more efficient with less DC to AC and vice versa conversions.

[@jcf828]

Great explanation and video, thanks

[@handbaked4937]

Good explanation.

[@time4thetruth305]

"Wow, Thanks for your explanation!"

[@janverwey3920]

Great video thanks. Was considering the Huawei SUN2000L hybrid inverter with the Huawei battery module 5kwh, with 12 x 400w trinasolar panels. Two questions if the grid power goes down can we still have power feeding to our fuse board to turn on a light or boil a kettle etc and will it still charge the batteries if the grid goes down.?

[@EVPuzzle]

I think that depends if you install the huawei backup box or not?

[@janverwey3920]

@@EVPuzzle great thanks for the info, that wasn't mentioned to me by the wholesaler! I'm reading up on it now

[@EscribanoEl]

@@janverwey3920 That's very useful information. Thank you to both of you. No, they don't always mention details like that!

[@ab-vh1ld]

Great video, thanks. Could you clarify something please? I have a 3.68kW inverter (Solaredge) with 5.7kW of panels. I'm on the Powerwall plan with Octopus, when I checked the apps yesterday, the inverter was sitting at 3.6kW but the Powerwall app was exporting 6.8kW to the grid, the Powerwall was at 100%. Does that mean the inverter and Powerwall can export a combined sum? I don't have a G99.

[@EVPuzzle]

Oops but why were you exporting from the battery during peak solar period?

[@ab-vh1ld]

@@EVPuzzle No idea! Tesla control the battery on the Octopus/Tesla tariff, I think.

[@damiendye6623]

​@@ab-vh1ld though when on the telsa octopus virtual power plant plan , you handed control over to octopus. Hence they take it when needed.

[@williamarmstrong7199]

I have a Solis inverter with 4.2KWh panels and a supposedly 6.8KWh Solax "Triple power" gen 2 battery (actually maximum 5 KWh) and a Solax X1-retrofit inverter / charger. The reason I went for this is to get 6.2 total KWh into my EV, 4 KWh from panels on a sunny afternoon and 2.5KWh from my battery. The problems I have are the battery only maxes out at 5KWh measured (10% reserved the rest is supposed to be "conversion losses" ) Also the max charging rate of the battery is 2.5 KWh and max output is 2.5KWh so boiling a kettle draws from the grid. :( Also when my battery gets cold (it is in an unheated dry lean to.) The max charging rate drops to around 850 Wh even at 9 degrees C. At 0° C the capacity is below 2.5 KWh and it is effectively useless. To say I am disappointed is putting it mildly. I hope to be able to move the battery inside next year when I build a new porch on the house. If not replace it. Suggestions? Why did you get rid of your Give Energy battery?

[@EVPuzzle]

What's the make of battery? Doesn't sound like a very good system at all with all those issues

[@richardjerman2435]

I don't understand why you'd want to export to the grid from a battery?

[@EVPuzzle]

To be paid more than you paid for the energy to charge it. There's lots of money to be made trading energy

[@sleavesley]

I have a recent install of 4.68kw on an East West array. Im looking at AC coupled inverter and battery. I have SolaX system and cost for X1AC and main battery is around £3700 plus installation. I would need it to go in my separate garage but mains distribution board is a good distance and I have tarmac drive. Have an RCD in garage running to MCB in main board. But the run goes through house in ceiling void between ground and first floor and then within inaccessible voids. I have calculated it would save about £80/90 in winter months when Solar reduced at 7.5p obviously less saving at 10p to top battery up. Payback for battery would be 5 years. If I had the money I’d get it done and the system would be complete until renewal of inverter etc. I can see the benefit for those that can’t use Solar with this system too.

[@huskypup3489]

Why does the teaser picture show a diagram, while the video is just a bunch of chatter?

[@EVPuzzle]

Because a thumbnail "teaser" is a picture and a video has audio too? 🤔😉😉 Being serious though images are shown in several of my other videos. If there's anything specific you're interested in, let me know and I'll post an image up for you or include at the end of my next video

[@paulvickers1713]

Great video as usual. I have a few question if you can spare the time to answer it. I currently have a 4kw array on my house (which I get FIT for) and I'm looking at getting another array fitted to my detached garage. I have installed a 10mm SWA cable to run from my garage back to my consumer unit in the house. I would like to install batteries in my garage too (the wife doesn't want them in the house). What is the best way to combine the two arrays to the battery system (without running the wires from the house roof back to the detached garage)? My thought was to have two separate arrays both with their own inverter then just connect an AC coupled inverter for the battery system. However when I got a couple of quotes to have the work done the contractors always recommend the second array with a hybrid inverter! Will this system see and utilise the power from my original array and charge the battery from this? I suspect not, but I might be wrong. Any help would be gratefully received. P.S. what manufacture would you recommend for the battery system? Thanks in advance Paul

[@kevinpickett7249]

Answering all my questions 👍

[@mirola73]

You completely saved the day explaining hybrid DC systems. Now I understand it.

[@EVPuzzle]

Love hearing from people that my videos have helped..so many people wer asking about it so I tried to do something that made sense

[@Meiboscopy]

Thank you. Really interesting

[@LeiChat]

So... we need a Hybrid Battery + Inverter that provides/simulates the CT clamp signal for solar generation so coupled devices (zappi/eddi) can know whether there is excess energy available from the solar panels rather than drawing from the battery. Ideally, software for that device could be configured with times and/or minimum excess/storage levels so the simulated CT clamp signal only informs coupled devices there is excess available when we'd like them to use it. e.g. The battery has charged to 80% so I would now like any excess from solar over 1.4kW to be used by my zappi but continue topping up the battery if it's less than 1.4kW

[@EVPuzzle]

Yes, I see it as a software standard communication sharing data between devices in real timep

[@LeiChat]

@@EVPuzzle A software standad would be good, assuming each manufacturer adopted it. Preferably with local connectivity so it has no dependency on cloud/internet. Other benefit of software is the measurements would hopefully be more accurate and less laggy than CT clamps.

[@ijcorner]

Have you seen the sunsynk 3.6 inverter? It's a hybrid inverter AC coupled. Isn't that the best of both worlds?

[@roypateman470]

Cool thanks

[@EduardoRodriguezRocks]

so your problem is having both systems, no the hybrid by itself

[@theoteam4641]

Hello very good video, I have a shade greener solar panels on the house we are buying and I want to convert that extra power that would normally go into the grid from the solar to be put back into my battery and then used in the house when we are at home at night. I can’t for the life of me figure out a way to make this happen without tampering with the a shade greener solar system part so it does not affect the lease which says not to do anything that would stop the production of power by the solar, but it also says we can use the power produced from solar in the house. Any idea?

[@EVPuzzle]

AC coupled battery will do the trick 👍 battery USES the power to charge up during the day

[@theoteam4641]

@@EVPuzzle that’s awesome thanks for that. Do you know if it allows me to install a current meter to the AC line on the grid side? so that way my victron ESS will know when the power from the panels is about to be put into the grid and then put it straight into the battery. Am thinking of installing a 30-70kwh battery from a custom built 48V Lifepo4 cells from Eve 304ah would be a right size or what’s your recommended battery size for a 3.75kw system to power the house for atleast 3-5 days?

[@EVPuzzle]

That is how they work, the meter or CT clip detects export from your main sand starts charging to the same level of export until export is zero. Victron solar inverter? Those make excellent battery inverts too. Its one of my preferred options. If its a Multiplus you could have a ready made battery system. 30 - 70kwh. That might be expensive. Battery sizing can be a challenging subject. Battery size impacts charging speed and discharging power rates as does your inverter and then there's your ability to charge it. How Much export do you have now per day? I'd be surprised if you gained much benefit from anything above 10kwh on a 3.75kw solar system but only you know your current energy usage profile.

[@theoteam4641]

@@EVPuzzle we haven’t moved in yet to the property to know for sure. The battery system won’t be as much. I want to keep it all under £10k including the price of multiplus II 10,000VA 48V. I am still deciding between the Quattro 48V 15,000VA or the multiplus II 10,000VA. Once I know more about how much power we use a day, I would multiply it by 3-5 to size the battery. Ideally I want to install mini split AIRCON in the house later on. Your right the 3.75kw system won’t be high enough to give more power, but if we can get it upgraded to 400w each panel to give 6kw then that would be ideal 😊

[@EVPuzzle]

Not all multiplus are certified for grid Tue connection . Quattros are. Multiplus ii 48/5000 is enough in my opinion . Not sure why you need more power. Parralell two 5000 is a good option if you really need huge power output or 100amp switching

[@gjsxnobody7534]

Wait.. so you are saying, that the only (main) reason to AC Coupled, is so that you can "see" the energy move, rather than having to flip between apps and doing simple math? Please correct me, because that seems like saying ".. .I would rather have less money in one bank application because I can see it in one place, rather than having two banks with more money, but, not having to do math in my head"..

[@EVPuzzle]

Crazy eh? But until you have it, lack of data integration is really annoying. AC coupling also provides more power in some cases, hybrid limited to solar plus battery in single limit

[@leexgx]

Ac coupling seems more for when you have chosen battery storage system afterwards (g99 is now I believe they changed it to a fast track system so 7.4kw/>32A limit< should be easier to get passed now) In my case ac couple battery is likely my only option due to the 2 locations of the likely solar systems and be fun with g99 (still don't get why the coupled battery storage system has to be counted towards generation because they don't export to the grid) hybrid is when you have the single hybrid inverter and battery in one location and the g98 approve simple (can't he blocked) 6kw solar panels with oversized battery's to soak the excess power

[@rafaldabrowski3375]

Hi in 5:05 min I see on the right site of zappi charger you exporting energy to battery, i have zappi charger and I need AC battery because I have solis inventer with out dc battery. All AC battery will be work with zappi app? Thanks

[@EVPuzzle]

If you put a CT on the AC side yes

[@rafaldabrowski3375]

@The EV Puzzle thanks for quick response, that means I need connect another clamp Ct between battery to zappi charger?

[@alexbowers4203]

I have dc coupled battery with a Solis inverter and the Solis app tells me dc details as well as solar details. The Eddi I have is set to gen+battery so it cannot differentiate however I use Solis home app and Solis Cloud app and both can tell me battery SOC and charge discharge as well as solar production. It seems your Huawei app is very limited

[@EVPuzzle]

It's not the most advanced for sure. As with others, there's potential there, just needs development and speeding up so give 30 sec updates

[@EduardoRodriguezRocks]

did you talk about back power?

[@keithjewers7273]

Great video - really clear and explained a few things I was not aware of. I had a 5.18kWp solar PV array installed last year, which utilises a Solar Edge inverter and also have a Zappi EV charge point, so am familiar with both the Solar Edge and MyEnergi apps. I am now looking into getting a battery solution because I am wasting a lot of the solar generated (now the sun is finally shining in the UK in 2022!) and it also makes much more sense now the electricity tariffs are sky rocketing. My installer has proposed either a Tesla Powerwall or a GivEnergy solution so your videos have been great to try and get my head round the areas that I need to consider to make the best use of either solution, ultimately to minimise my grid electricity usage as much as possible and to achieve a reasonable payback period on both the solar and the battery installations. I hadn’t appreciated that the GivEnergy inverter was additional to the one for the solar, so your explanation has been great at me understanding the topic better, plus explaining why the installer has indicated they need to go off to my DNO for approval of such an installation (which was puzzling me - my original solar installation has already had to be capped to 3.6kw for export purposes, as you outline in your video). Keep up the great work - it’s a pretty complicated area and anyone who simplifies things for the consumer is to be applauded.

[@EVPuzzle]

👍

[@ted_maul]

Nice explanation. I hadn't realised you had the GivEnergy AC-inverter installed. I have the Hybrid version. I wonder if some of the response lag you were seeing with the GE system was down to having 2 inverters in the system. Just speculation on my part.

[@EVPuzzle]

Unfortunately not. The response is different with the different batteries I've tested. Good thought though

[@sampathdinuga618]

Thanks

[@party999acb]

Hi in there process of having a Huawei 5kW inverter to our place together with 10x 510w Trina Vertex panels. Just trying to get my head around should I go with additional batteries what number of 5kW batteries I'd need. (if I went for just one 5kW how long would it last)

[@EVPuzzle]

Silly answer but depends how much you use it. Know your consumption. Planning a sizing video in next few weeks

[@party999acb]

@@EVPuzzle cheers look forward to seeing that. just that I saw when you had Huawei installed you had a 5kW Lunar wondered if performed well. Still in discussions with indoors re more panels roof will take a few more & I think the 5K inverter will take up to 9.6kW

[@bobcole3852]

You shouldn't put in a solar system to "export". Every utility I have ever heard of pays you a wholesale rate, much much less than what they charge you as a retail customer. Hybrid is only way to go. It is inefficient to convert DC from panels to AC and back to DC for batteries and then back to AC to use in your home. There are no AC batteries! If someone gave me an AC coupled system I'd give it away...

[@EVPuzzle]

Your loss Bob there are disadvantages to both

[@bobcole3852]

@@EVPuzzle no, your loss! In more ways than one

[@MichaelSmithRaces]

@@bobcole3852 what was the point of your comments when he explained in the video pros and cons? You need to take a hard look at your actions

[@garysmith5858]

Thanks for this. Do you know how much more energy is "saved" without it being converted twice?

[@EVPuzzle]

Differs with each system. Could be as much as 5-10% (guess) so half a kwh on a 5kwh battery if I'm fully charging it

[@johnnym1215]

Newbie here just trying to get my head around this. If you have a DC inverter ( pv and battery) then have for a Zappi car charger how does that work if you set the zappi to eco + ( so if I have this right it should only charge from excess solar power ) how does it distinguish from the solar power and battery? . Does it see the battery and solar as same power source and cannot tell the difference as far as its concerned?. If this is the case , wont it mean it will always see power and so if there was no solar it would still see the battery , hence drain it? Thanks for any help you can give

[@EVPuzzle]

You're right zappi can stop AC coupled batteries from draining . DC battery and solar combinations are harder to see and control...generally. I basically turned off the battery at a particular time window each day to charge the car on just cheap energy or truckle charged it in solar letting the battery do its thing too. Trick is to size the battery tight and have an EV with reduced charging rates if using solar

[@johnnym1215]

@@EVPuzzle thanks for your reply. I have another question if i may. So looking at DC inverters some are limited to 3.68Kw so don't need DNO permission( as you say , to whose benefit? ) some batteries are limited to discharge of 3kw , so at my peak usage times (normally cooking at night on all electric ) it can go up to or just over 5kw, I assume I will take approx 1.5-3 kw from the grid to cover it depending of time of year. If i understand this correctly would it be something like 3kw from battery .68 from solar in times there is solar generation or just 3kw in winter where there is no solar at that time? Is that what others do ,? I tried to do a calculation that if on average it works out to 1kw a day on grid from just cooking ( say 2kw for 30 mins = 1 kwh , i hope that is right lol) then at 30p that works out to just over £100 for the year. Did you look how much this costs in real life over the year?, or was it so low its not worth looking at . when you did it ( pre new electricity costs) So i might be answering my own question here , but i assume ( depending on costs) it might be better going for a 5kw inverter and battery ( and as much solar but i guess it will be around 4-5kw due to roof space) as it should cover any peak load. your thoughts would be appreciated

[@EVPuzzle]

I look at my grid use over the top of my solar during the day, any grid spikes are above the power limit of the battery or simply timing waiting for the battery to ramp up. For me our power usage is low so its actually really rare we draw from the grid.. We know our battery on a non sunny day allows us to cool on the cooker but not the microwave at the same time. That's with a 2.4kw battery power. 3kw gives me the ability to run the hob and oven together but still not the microwave. If you want freedom to power lots of things all at the same time then 5kw makes sense and a bigger battery that allows 5kw output. Both the battery and Inverter needs to be capable of 5kw output. I find in those instances where the oven is not at temperature so on and other devices are in use, it's for minutes only and only in summer, we don't tend to cook late at night. The reality is those moments going over our power limit cost very little and in my mind aren't worth a premium. I'm going with 3.6kw output from the battery which will be more than we need for 99% of the time

[@johnnym1215]

@@EVPuzzle Thanks again for your reply . I am only just looking into this and find that your way of thinking of re return of investment very similar to mine. I tried persuading the wife its better to spend £10-11 k on solar and battery etc , and at least get some return ( £600 +a year back) in cheaper bills, than leave it in the bank earning next to no interest. She did not quite see it that way LOL. Have you decided what system to go for yet or are you still in a testing phase thanks

[@EVPuzzle]

No my system is here and almost up and running . Keep it quiet but it's a Victron 48/5000 with 17kwh of Pylontech. Way more power than I need

[@sanjaysingh-yz7cz]

Great video really informative. I have a question, I am planning to install 8KW solar with tesla powerwall 2. But DNO shot down 1. Max power export to 4KW and 2. Didn't allow me to proceed with Tesla powerwall option as this will increase the capacity to 13 KW i.e 8 KW from panel and 5KW from powerwall even if my max export is clipped to 4 KW. Now I have two options which was proposed 1. Reduce the panel or sacrifice powerwall so that overall output remains at 8 KW or set up hybrid system so that for DNO battery and panel remains behind inverter. Does that impact my export ability or import ability during off-peak and store in battery. Request anyone can please help me with this .. Thank you

[@EVPuzzle]

Sounds like you've git to grips with the restriction already. They're not allowing 8 plus 5 export. Powewall can be restricted to 4kw I believe . Such a shame DNO are basically restricting systems like this. It sounds like theyre planning what if everyone on the street installs 4kw which leaves capacity on the table for decades. It's wrong

[@sanjaysingh-yz7cz]

@@EVPuzzle Thank you for your prompt response. I will explore the option of putting 2XG100 limiter ( set at 4KW) one at the overall connection with grid supply and one infront of Tesla Powerwall. I hope this is what you have suggested. Any other idea will be really appreciated including anyone in this forum.

[@sanjaysingh-yz7cz]

@@EVPuzzle further update DNO declined this option as limiter has response time hence even if it limits to 4KW but there is probability of micro or nano sec where it mY go beyond 4KW 😔

[@EVPuzzle]

That's really sad news and makes no sense as other DNOs are happy to approve G100 approved devices in the Config. When I hear these things I always think something doesn't sound right like they're just refusing for the sake of it. Maybe ask what their plan is to upgrade the substation that can't support more than 4kw from your array or what the actual Limiting infrastructure is. Have the explained why it's not possible?

[@LCD72]

So are you both saying that the DNO can forbid you from installing a Powerwall 2? If so, will the installer do a DNO application before they come to install?

[@DorsetSaferRoads]

you can get DC current clamps

[@EVPuzzle]

And fit them where? Open up the inverter?

[@DorsetSaferRoads]

@@EVPuzzle input to the inverter from the solar