diy solar

diy solar

Cell prices coming down

Steve_S said:
Of Course that is how it always happens. Not just batteries either, Dag Nabbit !
Goodness me, I saw an advert for NoNameBrand 280AH for $35usd - RUN forest RUN !!!
I expect we will also be seeing a lot of SHLOCK FLOGGING in short order...
BUYERS BEWARE ! - Engage Common Sense & Critical Thinking.
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I fully expect we will see the reject cells come out of hiding similar to during covid supply chain issues as prices drop more.

I just ordered 96 cells from Luyan, they haven't hit the boat yet and I'm very happy with the price I paid. I paid more each for some of the B grade cells I have from her and 18650. All of those B grade have been a thorn in my side with balancing. Those are coming out of the house bank and getting a JK with 2A active balance and used in other applications such as my golf cart.

Learned that lesson the hard way. I was able to adjust max charging voltage to keep cells in balance better above 3.4V, however I do have 2 cells that drop much faster below 3.4V as soon as charging stops and will be 0.06V below the rest.
 
OffGridForGood said:
Naturally the cell prices are falling...that is clearly because I got all my cells and packs built already.. .:fp2
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Add more and average the price per cell downwards.

It is no different than buying more PV at lower prices as time passed. It is the average cost that matters when computing ROI over long periods of time.

I know farmers that bought land at $1500/acre or less, then later bought more at $10,000/acre or more. It makes the average cost per acre lower when penciling profit.
 
Zwy said:
Add more and average the price per cell downwards.

It is no different than buying more PV at lower prices as time passed. It is the average cost that matters when computing ROI over long periods of time.

I know farmers that bought land at $1500/acre or less, then later bought more at $10,000/acre or more. It makes the average cost per acre lower when penciling profit.
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Add more and average the price per cell...DSAM! {Hey ya not HELPING the situation!} DSAM!!
 
OffGridForGood said:
Add more and average the price per cell...DSAM! {Hey ya not HELPING the situation!} DSAM!!
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Look at it this way, if it pencils out well with current utility rates, you will be smiling when utility rates increase.

I doubt utility rates will decrease. Second, if the government changes the rules on DIY batteries or imposes restrictions when tied to grid due to utility lobbying, you can always opt out of any grid power.
 
Zwy said:
Learned that lesson the hard way. I was able to adjust max charging voltage to keep cells in balance better above 3.4V, however I do have 2 cells that drop much faster below 3.4V as soon as charging stops and will be 0.06V below the rest.
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see post from @42OhmsPA buys 17 cells not 16. cull the weakest one?

42OhmsPA said:
$71 ea. Delivered to PA.
Screenshot_20240224-110605.jpg
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17 cells - so one can be spare? {or do you build 17s packs?}
 
Zwy said:
Look at it this way, if it pencils out well with current utility rates, you will be smiling when utility rates increase.

I doubt utility rates will decrease. Second, if the government changes the rules on DIY batteries or imposes restrictions when tied to grid due to utility lobbying, you can always opt out of any grid power.
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in my Province they recently lowered the off-peak rates from 8.4 to 2.4 cents ...quadrupling my ROI time!!
yeah, they also increased the on-peak rates...but I seldom use on-peak power, ever! LOL.
I think your right, utilty rates will generally increase, and likely faster than other costs of living.
 
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OffGridForGood said:
see post from @42OhmsPA buys 17 cells not 16. cull the weakest one?
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I thought the cells would be better than than what I ended up with. Don't get me wrong, they work well in the bank, those few Ah's at the very top I'm not interested in anyway. At the bottom, those cells actually hold up well. If one checked capacity, those cells would pass. It just leads to an imbalance between cells I don't care for and the Batrium burns off more watts as heat trying to balance.

The 18650 cells all tested above capacity but one always lags. Those were B grade and sold as such. The rest stay together very well, it is a classic example of where one should order 17 and cull one.
OffGridForGood said:
17 cells - so one can be spare? {or do you build 17s packs?}
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I order for 16S and can always use cells in a different application or for seasonal use like in winter, for some extra capacity by installing them in a premade box with a 2A active balancer. I ordered a pair of boxes from Luyan and will be using the cells that give me trouble in those. Then see how they fare with active balancing.
 
Sverige said:
No comment! 😂
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They’re going down.

Buy now before action is taken?

The United States has warned China that the US and its allies will take action if China tries to ease its industrial overcapacity problem by dumping goods on international markets, according to American officials.

Two senior Treasury officials said that a US delegation made its concerns clear in a recent visit to China, including in conversations with He Lifeng, the vice-premier responsible for China’s economy.

“We are worried that Chinese industrial support policies and macro policies that are more focused on supply rather than thinking about where the demand will come from are both careening towards a situation where overcapacity in China . . . is going to wind up hitting world markets,” said Jay Shambaugh, the under-secretary for international affairs, who recently led an economic team to Beijing.

The US is most concerned about advanced manufacturing, and particularly clean energy sectors such as electric vehicles, solar panels and lithium-ion batteries.
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www.irishtimes.com

US says it will act if China dumps goods on global markets

Western governments fear Beijing may try to ease domestic overcapacity with cheap exports
www.irishtimes.com www.irishtimes.com
 
42OhmsPA said:
$71 ea. Delivered to PA.
View attachment 198049

Link? Will they ship to the US?
I still regret not ordering more Envision from 18650.
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I checked their shipping rate to Europe and to me in Sweden, 8 cells comes out to $76.64/each, but that does include their cheeky 4.4% credit card payment surcharge, as I wouldn’t order a product like this without the backup of a credit card chargeback in case what showed up was junk product.
 
That is another concern I had, tariffs could be enacted on raw cells. The other was shipping rates can increase overnight, negating any drop in cell prices.
 
Zwy said:
I just ordered 96 cells from Luyan, they haven't hit the boat yet and I'm very happy with the price I paid. I paid more each for some of the B grade cells I have from her and 18650. All of those B grade have been a thorn in my side with balancing. Those are coming out of the house bank and getting a JK with 2A active balance and used in other applications such as my golf cart.

Learned that lesson the hard way. I was able to adjust max charging voltage to keep cells in balance better above 3.4V, however I do have 2 cells that drop much faster below 3.4V as soon as charging stops and will be 0.06V below the rest.
Click to expand...
I've been debating about creating a 'life with grade B LiFePo4 cells 1 year later' thread but hesitant due to all the grief I'll get from the fanboys. Several cells out of a 120kwh bank have to be replaced. They would have already been replaced but my $bank$ squashed the payment because it went to China. I'll have to jump through a few hoops to get the transaction to clear.
 
Kornbread said:
I've been debating about creating a 'life with grade B LiFePo4 cells 1 year later' thread but hesitant due to all the grief I'll get from the fanboys. Several cells out of a 120kwh bank have to be replaced.
Click to expand...

Create it. I would like to see some statistics on this. For reference, I also run a bunch of 'grade B' cells (even a bunch I haven't mentioned here about) but I just can't seem to get a bad one... I want a bad cell...
 
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