Page 2 of 2

Re: Tesla home storage

PostPosted: Thu May 14, 2015 8:30 am
by Gordon-Loomberah
The Tesla Powerwall battery is only designed for grid-connected inverters, but they will be compatible with Fronius Symo hybrid inverters, which we'll have later this year. They can continue to power a house during a blackout, however, I dont know if you could use one as a stand-alone off-grid inverter. I think the Powerwall has a charger and BMS built in. You would need to stack 2 or 3 to make it usable if you had any loads with peaks over 3kW, or 2kW continuous.

Re: Tesla home storage

PostPosted: Thu May 14, 2015 9:19 am
by offgridQLD
Perhaps we need to make some fiberglass or composite molds for a nice rounded box. Purchase some automotive primer, metallic paint an some clear coat. Throw some Calb cells and a BMS in it all call it the POWER FLOOR! Perhaps even put some nice lockable caster wheels on it ;)

I think Tesla would have some serious competition :lol:

I'm totally over the Tesla stationary storage talk its over rated. As others have said( it's a battery in a box)

Kurt

Re: Tesla home storage

PostPosted: Thu May 14, 2015 10:33 am
by jimbo
The sad part is all the green MP's are speaking on social media (Twitter) about how these batteries are revolutionary and now everyone can go off grid. You would think people in power that have the potential to change laws/policies would have a bit of knowledge on what they are pushing.

Re: Tesla home storage

PostPosted: Thu May 14, 2015 10:38 am
by Gordon-Loomberah
Perhaps you should post or tweet (or whatever you do on twitter!) and tell them that they are not for off-grid use.

Re: Tesla home storage

PostPosted: Thu May 14, 2015 10:40 am
by offgridQLD
Once you put something in a shiny box it becomes very marketable....just think apple computers.

The trouble is if it becomes to mainstream or the government have anything to do with it. Perhaps all stationary storage will attract some kind of tax or if that's to hard to pass there will be some kind of mandatory "safety" ;) inspection required every 6 months at ridiculous ever increasing cost. :evil:

Kurt

Re: Tesla home storage

PostPosted: Thu May 14, 2015 3:45 pm
by karrak
Kurt, I love your comments about putting things in shiny boxes, very true!

Only good thing I can see is the warranty, not sure of the fine print but ten years with ten years extension is not bad. Do we know what the fine print is?

Is the 7kW unit suitable for off grid? I am puzzled by the low maximum discharge of 2kW which assuming they are only using 70% of the available energy in the battery to prolong its life, equates to around C/5 if my maths are correct.

I think the devil will be in the detail with these battery packs. I am being lazy and haven't tried to find any detailed specs, has anyone seen anything?

Simon

Re: Tesla home storage

PostPosted: Thu May 14, 2015 10:00 pm
by Gordon-Loomberah
As far as I have read, neither battery is suitable for off-grid.

Re: Tesla home storage

PostPosted: Fri May 15, 2015 3:30 pm
by Gordon-Loomberah
Trina have released what appears to be a better battery so far as output and capacity goes (IMO), without all the fanfare.
http://reneweconomy.com.au/2015/trina-s ... rage-31674

Re: Tesla home storage

PostPosted: Fri May 15, 2015 4:06 pm
by offgridQLD
The outputs do look a better but......

"Expected cost $1200 US pr KWH :shock: "

$24,000 US for 20kwh. I guess if that has the DC/AC inverter in it. As in a true ready to go system (unlike the Tesla power wall) . Then its not to bad.

Kurt

Re: Tesla home storage

PostPosted: Fri May 15, 2015 4:09 pm
by Gordon-Loomberah
Yea, the price is a bit offputting, but if it can be used stand-alone off-grid, then it isn't too bad with the inverter included. We'll have to wait and see on pricing though- they can't all sell for that rate, as there are several different capacity inverters in the range.