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10kW Hybrid Inverters
#11
I honestly think above is really Good deal. Yes 2x initially but you save alot first years due to efficiency.

And IF you go that route you make me jealous Wink

When im done with My current project i Will for sure look into victron or something in the middle.
caosmen likes this post
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#12
In many, if not all meters, the meter registers the sum of all three phases. Therefore if you consume 1kw on Phase A, and consume another 1kwh on Phase B, bit export 2kW on Phase C then your total power is zero.

I am assuming you are grid tied. So my question is: do you actually need three phase at all?

If you are grid tied you do *not* need to size for peak power. The cost of chasing peak power is disproportionate to the amount of energy you consume whilst drawing the peak power level. Most people would be well served by a 3kVA single phase inverter when grid tied. Only if you need to run as an island during power failure do you need to consider a larger inverter. Partition your electrical appliances on the distribution board into critical and non-critical loads. Work out the peak power of just the critical maintained loads and size accordingly.

You will not realistically be heating your house in winter with solar so give up on that idea.

Tim
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#13
Hi Tim. I have right Now 30 kwp at my roof. Missing angle is south. So this 10 kwp new will be just south. Right Now i just buy 3k kw per Year from grid and this is during Winter Time. Everything Else is done by pv. When i calc right i will go down to buy just 1000 kw from the grid in in Winter.
So i safe 2000 kw i buy during this time and i safe the other 6000 kw i use the other Time and dont Need To pay the 8 Cent here in Germany cause of eeg law.
Saving will be around 1000 Euro per Year cause of this again.

And when i Run a home 320 qm with Heating cooking etc for just buying 1000 kw from the grid i cannot complain.


@daniel

I realy like your Comments and you are with your YouTube Stuff a realy great Person that help ppl like me starting from Zero to get it done. Thanks alot
Learning in progress
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#14
(02-05-2020, 08:24 PM)caosmen Wrote: And when i Run a home 320 qm with Heating cooking etc for just buying 1000 kw from the grid i cannot complain.
Wow you've done a great job, my house is just a little smaller than you yours and I started with 26,000kw per year lol! It's going down now bit still.. Nice job! ;-)
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#15
w0067814 In many places and as in example Sweden you are not allowed to do that. Ie you need to make sure all 3 phases are as even as possible so using power on 1 phase and selling on another is big no no Smile One of the things setting up a grid-tie system is to check that.

But yes you are right sizing for peak power is really not realistic for most of us especially when you have the grid available. Thats why i only have 10kW 3phase and not 30kW Wink

Caosmen: Thanks! I really try. Not all my comments may always seem nice but I always try to raise thoughts and get people to think once more when doing things Smile We all learn along the way and best way learning is doing it your self. But its always good to see what others f*cked up Big Grin I have done my fair share testing and spending money on stuff that was total waste...
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#16
(02-05-2020, 10:58 PM)daromer Wrote: w0067814 In many places and as in example Sweden you are not allowed to do that. Ie you need to make sure all 3 phases are as even as possible so using power on 1 phase and selling on another is big no no Smile One of the things setting up a grid-tie system is to check that.

In the UK you can export up to 16A per phase with very little questions asked. There are plenty of solar installations exporting on a single phase in houses with three phase supply. Yes the phases do need balancing but at the low power levels I was talking about the grid company is unlikely to care. Heck, even switching on a kettle would provide a greater imbalance than I was discussing.

My parents house has three phase where the lighting and sockets are all on one phase and the night storage heaters are on the other two, so the house is basically single phase during the day and two phase during the night from a current point of view. I doubt they are unusual. The grid looks at averages across hundreds of houses on a transformer.

Caosmen installation is unusual in that it is very large system which I was not aware of, so in his case the point I was making doesn't hold true but I expect for many it would.

PS: Daroma, Caosmen,

What do you have which requires such a large system? I am assuming this is domestic?

Tim
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#17
Yeah Tim, its domestic. Here in Sweden, we dont have gas or oil to heat our houses, we only have electric and it costs a small fortune! I would love to call SSE or British Gas like when I used to live there and ask them for a gas supply! It would be one hell of a long copper pipe! Out here in Europe, 3 phase is surprisingly common, especially here in Scandinavia where both me and Daromer live.
Storage heaters... Yep, remember those bad boys... Undecided
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8kW Solar
30kW Heating system
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#18
w0067814
Usegage is not the same and when building a house you are obligated to actually split the load evenly. Same goes with solar. You can get away with up to 1kw on one phase but when you talk about 5 or even 20kWp that many have here you need to have it 100% equal and you actually need proper 3phase systems that can talk to the grid and export only when allowed basically.

These kind of regulations will come more and more and just the other year they banned tons of inverters due to this Smile

Once again dont confuse normal useage to design during beginning and exporting. They have different demands.

example: The grid company one day last year phoned and said: We are at your house now and going to do a check on your system. Because you export some power during the night and thats possible. We think you wired the meter backwards"

This was 50w difference due to export Smile Though there was nothing wrong with my system. They just havent checked the papers that said I got battery bank approved and hooked up and therefore can export whenever I want as long as its even. They complained that i exported when there was no Sun.

This is though Sweden but many places have started to make sure systems and power are evenly distributed as good as it can from design perspective.
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 100kWh LiFePo4 | 20kWh 14s 18650 |  66*260W Poly | ABB S3 and S5 Trip breakers
Upcoming: 14S 18650~30kWh
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#19
w0067814
I just have sutch a big One since i know i use alot of electricity. And i See the Chance to pay just 8 Cent per kw when buying pv then 30 or in 5 years 40 Cent per kwh in Germany.

Now i am just doing it again more profitable with a diy powerwall. I know it is absolute not normal so you Point is 100% True. I always say i have right Now 3x the avg User and i still buy from grid in the Winter. So you Position is absolute correct.
Learning in progress
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#20
Good thing about Victron as well is resale. If you change your mind or update you can sell easily.
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