#1 Oct. 27, 2017 12:08:31

morrisok
From: Sussex
Registered: 2011-11-09
Posts: 79
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DIY Powerwall

Hi Guys,

I've started collecting cells to make my own home battery, based on the Tesla Powerwall but a homebrew.

Thought I would share as it seems to be a great way of storing all that excess solar power without costing a fortune.

I've joined a facebook group and they have a forum with a wealth of information on it. Below is a link to an article explaining a bit about it and the facebook and forum links.

https://motherboard.vice.com/en_us/article/kzz7zm/diy-powerwall-builders-are-using-recycled-laptop-batteries-to-power-their-homes.

https://www.facebook.com/groups/diypowerwalls
www.diypowerwalls.com

What do you think?




Kevin

URN 131, 3.92KWp 12x 327W E20 SunPower panels Sunnyboy 4000 inverter, facing ~south, no shading issues. Location: Sussex, http://pvoutput.org/list.jsp?userid=12216

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#2 Oct. 30, 2017 10:02:17

bhommels
Registered: 2011-10-03
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DIY Powerwall

Hi Kevin,
Looks great! I think the main downside is already listed in the article in that it takes a lot of time and effort to find cheap batteries. What makes Tesla stand out BTW is their technology to monitor and disconnect underperforming batteries from the array. It seems this is not on the DIY radar as all the pictures have the cells hard-wired. Please keep posting here about progress, keen to find out how you get on. Regards Bart

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#3 Oct. 30, 2017 13:02:30

morrisok
From: Sussex
Registered: 2011-11-09
Posts: 79
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DIY Powerwall

bhommels
Hi Kevin,Looks great! I think the main downside is already listed in the article in that it takes a lot of time and effort to find cheap batteries. What makes Tesla stand out BTW is their technology to monitor and disconnect underperforming batteries from the array. It seems this is not on the DIY radar as all the pictures have the cells hard-wired. Please keep posting here about progress, keen to find out how you get on. Regards Bart

Hi,

They do actually, most of the DIYers are using the same Tesla style fuses (thin wire that burn up at ~5A). The BMS that I'm looking at and others are using is called Batrium and they offer the ability to trip a breaker on fault conditions. Finding batteries does take a while although I've done well of Ebay recently. It does take time (and space) but am hoping to do it for well under half the price of the Tesla Powerwall.



Kevin

URN 131, 3.92KWp 12x 327W E20 SunPower panels Sunnyboy 4000 inverter, facing ~south, no shading issues. Location: Sussex, http://pvoutput.org/list.jsp?userid=12216

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#4 Nov. 1, 2017 09:35:58

BackYardSolar
From: Surrey, on Gatwick flight path
Registered: 2015-05-30
Posts: 46
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DIY Powerwall

Hi Kevin,

Great, I will follow the Facebook link as I am very interested in some form of storage. I have done the maths and a Powerwall 2 at around £8,000 installed would never pay for itself.

My opinion is that you need to increase your panel size first if you can, as this is the cheapest option and gives you more generation for your batteries.

Keep us posted on your progress please.

Thanks for link as I have been looking for something interesting on storage.

Regards Howard.



SolarEdge SE4000 inverter, 16 x Romag powerglaz 235W panels. South facing at 30 degree angle in Surrey just East of Gatwick and under the flight path.

ESS AC coupled system using a Victron Multiplus 24V/1600VA Inverter/Charger - 8.16kW Trojan 875 battery bank.

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