Tesla PowerWall Specs Question

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terabit

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Hi,

I recently went through the specs of the Tesla PowerWall unit and then calculated how much amps it would be able to deliver based on the kWh and voltage parameters.

So for the 10 kWh unit @ 450V one could possibly get 22.22 amps out.

But I then I read that the unit can only supply "5.8 amp nominal, 8.6 amp peak output" - http://www.teslamotors.com/powerwall

Can someone please explain what the difference is between what I calculated and what the unit can actually supply?

Thanks
 
Its rated 2000W so 2000W/450V = 4.44A which looks correct. Your calculation is amp-hours not amps.
 
Indeed.
10 kilowatt-hours, not 10 kilowatts.
 
Thank you!

Just comparing what I would get out in comparison to a generator.

The generator I currently have is 10KVA one that puts out 10kW.

Doing the correct calculation (10000/230) I get about 43.48 amps.

The wall unit does not give out nearly as much as the generator and won't be able to power my household (excluding stoves, kettle, geysers and swimming pool pumps).

The wall unit would save on operating and maintenance costs though.

With that being said, can one use the wall unit as a potential UPS for the computers and laptops only?
 
terabit said:
Thank you!

Just comparing what I would get out in comparison to a generator.

The generator I currently have is 10KVA one that puts out 10kW.

Doing the correct calculation (10000/230) I get about 43.48 amps.

The wall unit does not give out nearly as much as the generator and won't be able to power my household (excluding stoves, kettle, geysers and swimming pool pumps).

The wall unit would save on operating and maintenance costs though.

With that being said, can one use the wall unit as a potential UPS for the computers and laptops only?
Click to expand...

The powerwall is a battery. It has no inverter or anything like that, as far as I know.

So you'd need a proper inverter/charger, and then you could string a couple of powerwalls in parallel to power your correctly sized inverter?

$$$$$ :/
 
It says on the site : "DC-AC inverter not included." Maybe you should consider 2 or 3 x 5kVA Axpert Units in parallel, run with a large battery bank for your needs.
 
desiganp said:
It says on the site : "DC-AC inverter not included." Maybe you should consider 2 or 3 x 5kVA Axpert Units in parallel, run with a large battery bank for your needs.
Click to expand...

Thanks I'll check that out!
 
Sinbad said:
$$$$$ :/
Click to expand...

Yes that would be rather expensive! :(

The only thing stopping load-shedding from killing my computer at home is an app I used called ShedAlert.

Has been very accurate so far :)
 
terabit said:
Yes that would be rather expensive! :(

The only thing stopping load-shedding from killing my computer at home is an app I used called ShedAlert.

Has been very accurate so far :)
Click to expand...

Get a ups ;)
 
terabit said:
I think that is the only solution. What is the cheapest yet somewhat reliable UPS units available?
Click to expand...

What are you looking for? Something to protect from over/undervolt, and allow a bit of shutdown time?

I use an APC 2kva line-interactive unit.
 
terabit said:
Thank you!

Just comparing what I would get out in comparison to a generator.

The generator I currently have is 10KVA one that puts out 10kW.

Doing the correct calculation (10000/230) I get about 43.48 amps.

The wall unit does not give out nearly as much as the generator and won't be able to power my household (excluding stoves, kettle, geysers and swimming pool pumps).

The wall unit would save on operating and maintenance costs though.

With that being said, can one use the wall unit as a potential UPS for the computers and laptops only?
Click to expand...

Yes but that would be insane, you could buy the correct sized batteries/charger/inverter for that at a fraction of the price.
 
Sinbad said:
What are you looking for? Something to protect from over/undervolt, and allow a bit of shutdown time?

I use an APC 2kva line-interactive unit.
Click to expand...

Exactly that!

Thanks I'll take a look.
 
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