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3554 posts

Uber Geek


  # 1854919 29-Aug-2017 18:43
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I hate to ask a stupid question, but all this "anti-islanding " is applicable to electrical generation of wind power also, right?

238 posts

Master Geek


  # 1854932 29-Aug-2017 19:53
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kingdragonfly: I hate to ask a stupid question, but all this "anti-islanding " is applicable to electrical generation of wind power also, right?


It would do as it relates to the electrical system.

From my reading, I don't believe there are approved inverters for providing back-up power in NZ homes that are grid connected and relevant stadards are still being refined.

 
 
 
 


3885 posts

Uber Geek

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  # 1854950 29-Aug-2017 21:18
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If you are in the Vector Lines area (Auckland), Vector offer a Tesla powerwall based solar and battery system that is both grid connected and can operate "off grid" in an outage. They also used to offer an non Tesla version of the same system. @Ruki and at least one other GZ member have those systems installed.






929 posts

Ultimate Geek
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  # 1855496 30-Aug-2017 20:38
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What you would need for this is a solax hybrid inverter+a few lead carbon batteries with an EPS relay.

 

My solar wont work during a power outage but as I hardly ever get one its not concerning.




3554 posts

Uber Geek


  # 1855603 31-Aug-2017 07:46
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I was thinking about what would happen during a natural disaster.

My understanding about lead carbon batteries only last about 7 years.

Here's an article from HomePower about various batteries

https://www.homepower.com/articles/solar-electricity/equipment-products/grid-batteries

929 posts

Ultimate Geek
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  # 1855682 31-Aug-2017 09:09
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kingdragonfly: I was thinking about what would happen during a natural disaster.

My understanding about lead carbon batteries only last about 7 years.

Here's an article from HomePower about various batteries

https://www.homepower.com/articles/solar-electricity/equipment-products/grid-batteries

 

 

 

The amount of cycles you will get out of a lead carbon battery depends on how deep you discharge it when you discharge it, if you only discharge it 20% each time you could get 11000 cycles even daily that's a 30 year lifespan.

 

Simply put size it correctly and you will get more than 7 years.

 

 

 

 

 

 

If you want really long lasting batteries go with NiFe but as you will find out like all batteries they have there drawbacks (charge and discharge efficiency)




3554 posts

Uber Geek


  # 1861966 10-Sep-2017 20:47
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Good article on very big batteries.

https://www.computerworld.com/article/3182369/sustainable-it/san-diego-installs-massive-flow-battery-that-can-power-1000-homes.html

"San Diego installs massive flow battery that can power 1,000 homes
Flow battery systems have an expected lifespan of more than 20 years

By Lucas Mearian
Senior Reporter, Computerworld

San Diego Gas & Electric (SDG&E) has taken the wraps off a new battery energy storage project that will store up to 2 megawatts of electricity -- enough to power 1,000 homes for four hours.

The new vanadium redox flow (VRF) battery substation was installed by Osaka, Japan-based Sumitomo Electric and will store renewable energy harnessed from solar panels and release it when resources are in high demand during peak business hours.

...
One problem with flow batteries for residential use is that they're enormous. In order to power a house, you'd need a flow battery about half the size of your garage, Frankel said.
...
"


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