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Questions about an AC coupled powerwall
#11
After watching reading and watching videos, i updated the pictures for myself. Just to understand the difference better.
I suggest to watch the following video: https://www.youtube.com/watch?v=F1q5uIzjj_M
It helped me a lot to understand the diffence between grid-off, grid-tie and hybrid.


OFF GRID                                                    HYBRID


So i would like to go with the hybrid inverter. That seems to me the best solution.
What do you think? Could the Fronius LOAD MANAGER be a solution in the HYBRID version?


In addition to the SMA Sunny Island, the MPI Hybrid from MPP Solar has already been recommended to me.
Perfect would be a SMA Sunny Boy Storage, but it doesn't support 48V.

Do you have any more hybrid inverter recommendations for me?
You can draw my diagrams better with https://www.draw.io/.
You can get the XML's from https://github.com/breyer/DIY-Powerwall ;) 
Pull requests are welcome!
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#12
I’m setting up based around Victron https://www.victronenergy.com/inverters-chargers

They can apparently talk with Batrium.
DK100 likes this post
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#13
Thanks for your recommendation @Jon
The MultiGrid 3kVA from victron energy looks interesting. And there are nice wiring diagrams, better than mine.

This is exactly the setup i would like to go:



The 3kVA brings me to a additional question:
As you can see in my first post, i have times where we consume more the 3kVA over a longer period. Especially when my wife is in the kitchen Wink

So will this work with a hybrid inverter with 3kVA like the mentioned above?
Because if not, there seems just on solution --> The MPI Hybrid Series with 10kVA from MPP Solar/Voltronic.
You can draw my diagrams better with https://www.draw.io/.
You can get the XML's from https://github.com/breyer/DIY-Powerwall ;) 
Pull requests are welcome!
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#14
It seems that the solax 2nd generation hybrid will work well to
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#15
The Multigrid will loadshare when your demand is greater than the inverter capacity.
You can also add up to 6 in parallel over time as budget allows if you need
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#16
(03-05-2018, 08:54 PM)Photovoltaik.blog Wrote: Thanks for your recommendation @Jon
The MultiGrid 3kVA from victron energy looks interesting. And there are nice wiring diagrams, better than mine.

This is exactly the setup i would like to go:



The 3kVA brings me to a additional question:
As you can see in my first post, i have times where we consume more the 3kVA over a longer period. Especially when my wife is in the kitchen Wink

So will this work with a hybrid inverter with 3kVA like the mentioned above?
Because if not, there seems just on solution --> The MPI Hybrid Series with 10kVA from MPP Solar/Voltronic.

(03-05-2018, 09:54 PM)Farends Wrote: It seems that the solax 2nd generation hybrid will work well to
You should look further in to the Victron specs. I belive some of them have a boost function, but i dont think, that the 6Kw spike is a problem. It will just get the nessesary power from the grid.
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#17
Yes, looks same to me. I decided to buy a Victron Multiplus 5000/70 48v.

I thought about buying from MPP Solar, but this review https://mppsolar.review let me changed my mind.
In Germany we have a saying: „Who buys cheap, buys twice“
You can draw my diagrams better with https://www.draw.io/.
You can get the XML's from https://github.com/breyer/DIY-Powerwall ;) 
Pull requests are welcome!
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#18
I would like to keep you informed  Big Grin

My Victron MultiPlus 5000 arrived some weeks ago and i managed to set up my first 1kWh 14s10p battery.
I learned a lot more than i thought. Awesome!

I thought i can use my S0 energy meter and connect it to the VE Venus, but the Venus only understands ModBus protocol.
So i bought the ET340 energy meter from Victron, but missed the RT485 to USB cable Wink

So i still need to wait some days, before i can use my battery.

I also need to install a BMS. I already bought a cheap BMS. May there are better BMS for 14s10p batteries. 
I need to read more more more ...

DK100 and Korishan like this post
You can draw my diagrams better with https://www.draw.io/.
You can get the XML's from https://github.com/breyer/DIY-Powerwall ;) 
Pull requests are welcome!
Reply
#19
Good work. Though it looks like your soldering are cold joints many of them. They just look like blobs on the surface of the cells. What soldering iron did you use?

It should look closer to this: https://www.youtube.com/watch?v=OR472ONL7JI
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#20
Thanks for the video daromer. Fixing these cold joints is now on my list.
Will do this when i install the BMS.

My soldering iron is with flux. But I think the problem is that i didn’t clean the top of the cells.
You can draw my diagrams better with https://www.draw.io/.
You can get the XML's from https://github.com/breyer/DIY-Powerwall ;) 
Pull requests are welcome!
Reply


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