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Hello from Norway
#1
Hello!

This is my first post here. I have been lurking around for a while now.

Attached are a couple of pictures of my 24V system in my off grid cabin in the Norwegian mountains. The system is in an underground cellar in a shed I built a few years back. The temperature in the cellar is above freezing at all time. At least it has been since I built it in 2016. It can be very cold where my cabin is during winter. We often have temperatures below -20C (-4F).

I have started harvesting 18650 cells and plan to build an 80P7S pack when I have enough good cells.

not2bme likes this post
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#2
Welcome to the dungeon it looks like! Now let's see more lithium ions and less lead acid!
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#3
Very nice. What's your PV array size and how many ah in your current battery bank?
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#4
(01-20-2020, 05:13 PM)OffGridInTheCity Wrote: Very nice.  What's your PV array size and how many ah in your current battery bank?

My PV array is 800W, see picture below. I have 12x 6V/200Ah in a 4S3P configuration. That is 600Ah@24V but since my batteries are in the cellar where it is cold I have configured my battery monitor for 480Ah.

If you see in the lower left of the 3rd picure, behind the ladder, I have four Concorde 305Ah batteries as well. These are my spare bank. I can use them to charge my main bank in the darkest months when I'm not at my cabin. I use a Victron DC/DC that I can turn on over the Internet for this. I can also reverse this operation and charge the spare bank from the main bank.

 
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#5
Nice project!
_OS_ likes this post
Follow my Powerwall journey here: 
Youtube: https://www.youtube.com/channel/UCjXT8KJnEzo-DJHFRR1W8jg

Building the following:
20kWh Powerwall
8kW Solar
30kW Heating system
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#6
Testing cells, a slow process!
I have 299 cells above 2000mAh now out of a total of approx 500. About 50 of them are 0V, the rest below 2000mAh
Goal is 560 2000mAh+ cells in a 80p7s configuration.

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#7
Seven months have gone since my previous post. I now have approx 1000 cells above 2000mAh. I have harvested around 1800 cells. Many where 0V, some got very hot during discharge and about 500 cells where below 2000mAh. I have changed my mind about the cell configuration and want to go bigger to reduce the peak Amp on each cell.

I have not decided on how to assemble the packs. I have bought a kWeld spot welder, have various size nickel strips, glass fuses and resistor legs. I also have a heavy soldering iron. I have enough 5x4 cell holders.
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