450VDC instead of 48VDC

J

Joost2

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Jun 21, 2017
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Yesterday I was searching about the tesla power wall 2 and found that it works a roundabout 450VDC.
Also I wrote that the tesla power wall works with solar edge inverters that has a
DC/DC converter. This works with a efficiency up too 97%! Now I'm wondering is it wise too make a 20A +\- 450VDCpack too get the highest efficiency out to the whole system?

Now we have a 700pW solar tracker system and a 3Kw (10x 300W with micro investors)solar on the roof. In the next coming months there will be come a 3Kw system too. Solar edge has a DC/DC inverter so I'm thinking what is the best setup cost efficiency.
 
Joost2 said:
Yesterday I was searching about the tesla power wall 2 and found that it works a roundabout 450VDC.
Also I wrote that the tesla power wall works with solar edge inverters that has a
DC/DC converter. This works with a efficiency up too 97%! Now I'm wondering is it wise too make a 20A +\- 450VDCpack too get the highest efficiency out to the whole system?

Now we have a 700pW solar tracker system and a 3Kw (10x 300W with micro investors)solar on the roof. In the next coming months there will be come a 3Kw system too. Solar edge has a DC/DC inverter so I'm thinking what is the best setup cost efficiency.
Click to expand...
If you have enough cells, sure. 120S40-60P
You also have to be VERY comfortable working with voltages like that, your first mistake could be your last.
 
Check with the manufacturer. Im not sure anyone here tested to do that manually at all.

Also note that 450VDC is very very very dangerous... Touching those end poles... :)
 
daromer said:
Check with the manufacturer. Im not sure anyone here tested to do that manually at all.

Also note that 450VDC is very very very dangerous... Touching those end poles... :)
Click to expand...

I think an arc would get you before you could even touch it :p
 
With those higher voltages (esp above 96V), you need to have special switches and breakers. They have to be able to not only disconnect, but also stop the arcing that occurs during switch-off.

Another poster likened it to a Jacobs Ladder type of contacts. As they move away, the arc will naturally move along the contacts till it's extinguished.
Also note, that at those voltages, it is VERY easy to create an arc, and VERY easy to become the bad recipient of an arc. Think of the arc's power as being a lightning bolt.
 
hello,

You in Australia has 110VAC?
Here in Europe we have 230VAC and this is why I was thinking about higher voltage;)


Something else, how can I wake-up a li-ion cell? I have a lot off sleeping cells...
 
Joost there is no such thing as sleeping liion cells :) Either they are dead. Or they have their CID pushed. If the CID is pushed dont even try to revive them. it was pushed of a reason.

it its just a low voltage cell you can try to slowly charge it up with like 50-100mA untill you reach 3V. But if it doesnt take charge just bin it m8 :)
 
We only have 240v AC here in Australia, no 110v
 
450 volts limits your choice on equipment. 48volts is a really common voltage for off grid battery systems.

Why? Because if you touch one hand on ground and one hand on 48volts, it will shock you, but it won't kill you.

450 volts can stop your heart with the same action. There is a much higher level of caution needed at those levels. But given that level of caution, it will be more efficient.
 
Hello,

I emailed the company that installed the pv system and the call me back too gave advice.
For now I can trough the idea away ;)
Thanks for all your input.
 
Hi all,

There more and more I read about it I think there is a DC converter inside the powerwall.
The only thing I can't finger out is how it works backwards inside the powerwall. A optimisers pumps up the panel voltages or not? But how will it work inside a powerwall a converter can't work two ways?
 
Most of the way they work is the transformer the voltage up inside, convert and modify and transformer back down.
Easier to transfer the watts thru the circuit board.
 
Joost2 said:
hello,

You in Australia has 110VAC?
Here in Europe we have 230VAC and this is why I was thinking about higher voltage;)


Something else, how can I wake-up a li-ion cell? I have a lot off sleeping cells...
Click to expand...

We ave 240v in Australia.

Lol thats punny :rolleyes:
 
SolarEdge will come with a low voltage solution it when they don't know.

I have opened a optimiser it cost me serval days peeling off the 'rubber' and could not prevent too damaging it a little bit.
 
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