diy solar

diy solar

Prices dropping, will this continue?

Brucey said:
Yes, basically instead of a RAID (redundant array of independent disks) , we have a RAIB (redundant array of independent batteries). If a 12V battery fails, pull it out and throw another one in.

Note it's certainly still possible to diy cheaper with 280/314 cells, but compared to the eg4 wall mount 14kwh at $3400+?
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So I can put together two 7.2 kwh boxes with 304 cells for about $2400.00. For me that’s worth the effort. At that price it would cost me an additional $6000.00+-, that just about covers my four inverters and wiring.
 
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S Davis said:
So I can put together two 7.2 kwh boxes with 304 cells for about $2400.00. For me that’s worth the effort. At that price it would cost me an additional $6000.00+-
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I would agree, if you have the ability then being able to select known performing cells and BMS etc are worth it. I'm purely comparing to other off the shelf solutions.
 
So, I can buy 48 Eve M30 (306ah) for $4349.75 delivered from Gobel. That's $90.62 a cell. Add in the electrical enclosure I put them in, the seplos BMS, disconnect switch, class T fuse holder and fuse, terminals and odds and ends, I'm at around $6100 for for 47kWh. Just over $2000 for a 15.6kWh battery.
 
S Davis said:
I did my 84 cells and 12 boxes in three orders and had her include extra everything in the last order.
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Update: all plates, screws and busbars were there. I had pulled random boxes and even though the boxes were numbered, there wasn't any rhyme or reason why the cell boxes were for the 2 48V battery boxes that had the busbars, screws and plates in those boxes.

It was about as bad as stacking hay bales in the barn taking all of those cell boxes apart. Ran an assembly line.

My pallet showed up last week. There is a story that goes with The Package, I couldn't find the post but talked about it in my last video. Freight company dispatcher was a clown. 96 cells, 2 boxes. Other 64 cells go into a battery bank like the one in my house.


The Package.jpg
 
Tulex said:
So, I can buy 48 Eve M30 (306ah) for $4349.75 delivered from Gobel. That's $90.62 a cell. Add in the electrical enclosure I put them in, the seplos BMS, disconnect switch, class T fuse holder and fuse, terminals and odds and ends, I'm at around $6100 for for 47kWh. Just over $2000 for a 15.6kWh battery.
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I'd be at just around $2000 delivered for 16 Eve mb31 314Ah from 18650batterystore. Non inverter jk 200A BMS was about $100.
 
Brucey said:
I'd be at just around $2000 delivered for 16 Eve mb31 314Ah from 18650batterystore. Non inverter jk 200A BMS was about $100.
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I found the M30 to be a bit cheaper, has the same expected Ah (335+), and 10K cycles instead of 8K for the M31. I have Seplos BMSs in my original 3 batteries with 304Ah cells, so sticking with them. Unfortunately, they run around $219 each delivered.
 
Brucey said:
Yes, basically instead of a RAID (redundant array of independent disks) , we have a RAIB (redundant array of independent batteries). If a 12V battery fails, pull it out and throw another one in.

Note it's certainly still possible to diy cheaper with 280/314 cells, but compared to the eg4 wall mount 14kwh at $3400+?
Click to expand...
RAIB......I like it. 😄
I wouldnt plan on getting more than 10 years out of your batteries if they are cycled daily. Thats 3650 cycles. From what Ive read, that is a good guess on cycle life.
 
Dave911 said:
RAIB......I like it. 😄
I wouldnt plan on getting more than 10 years out of your batteries if they are cycled daily. Thats 3650 cycles. From what Ive read, that is a good guess on cycle life.
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Ten years seems like a good time line, to get reasonable use out of the LFP cells, and be ready for upgrade when the next innovation comes to market! :unsure:
 
Dave911 said:
RAIB......I like it. 😄
I wouldnt plan on getting more than 10 years out of your batteries if they are cycled daily. Thats 3650 cycles. From what Ive read, that is a good guess on cycle life.
Click to expand...
At the rate my solar addiction is growing hitting battery end of life is prob a slim thing as the battery banks grow in size.
 
Tulex said:
I found the M30 to be a bit cheaper, has the same expected Ah (335+), and 10K cycles instead of 8K for the M31. I have Seplos BMSs in my original 3 batteries with 304Ah cells, so sticking with them. Unfortunately, they run around $219 each delivered.
Click to expand...
What is the EVE M30 cell? Newbie asking.
 
Eve LF304k has now crept up by $3 at Nkon.nl for EU shipment. $86.95 -> $89.95/ ea. First price increase I’ve seen, after a long time of the price steadily dropping. Have we maybe seen the bottom of the price curve now?
 
I will not be surprised to see a far better battery chemistry on the market within five years. I don't worry about 'cycle life' as a purchase decision parameter. All these cells may have fewer cycles than advertised - we really don't know - however the rate of innovation and the incentive to find a better chemistry solution are clear. What will it mean to have cells that can last 8,000 or 10,000 cycles, if a new and far superior battery type comes to market just as our current cells reach 1500 cycles.
 
OffGridForGood said:
... What will it mean to have cells that can last 8,000 or 10,000 cycles, if a new and far superior battery type comes to market just as our current cells reach 1500 cycles.
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Depending on the adoption now of LiFePo4 it could mean a difficulty in marketing the new battery type. No reason to upgrade until failure for most people. Especially if costs have not been recovered on the old setup.
 
It is an unknown for now admittedly, I expect we will see far superior batteries long before we have time for 6000-8000 cycles on our LFP. The upgrade will not mean disposal of my current LFP cells, just repurpose them to run something less important in my life. I have the same plans for all my current inverters, replacement with better doesn't mean disposal of the existing ones, as long as they work they can be repurposed to other uses around my homestead, or the cabin or a mobile power plant, or ...other.
If we consider the transition from Lead Acid to LFP as an example, many people who already had LA hung on to the LA until as you say these didn't perform and needed replacement. A better product may make sense, regardless if costs have been recovered or not, especially if you can repurpose the current LFP set up, or sell it.
 
OffGridForGood said:
I will not be surprised to see a far better battery chemistry on the market within five years. I don't worry about 'cycle life' as a purchase decision parameter. All these cells may have fewer cycles than advertised - we really don't know - however the rate of innovation and the incentive to find a better chemistry solution are clear. What will it mean to have cells that can last 8,000 or 10,000 cycles, if a new and far superior battery type comes to market just as our current cells reach 1500 cycles.
Click to expand...
well thats pretty simple, it means we can avoid buying these new batteries and wait another 3-4k cycles and see whats new then.
 
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