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Solar Battery Cost Analysis


Gerald_db
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The biggest problem with this is twofold: 1) Prices are generally tied to Rand/Dollar exchange and price on demand so it fluctuates a lot. And most suppliers have different levels of markup. Ideally this should be done with dealer pricing, or a set margin of say 10% to get an accurate table of costs. 

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Going to go with 2 x 8 x T105RE's. Most cost effective and cycled to 25% DoD should give me 10 years and hopefully by then new technology has killed the price of storage. Other option is 8 x T105RE's and just to kill them in 4 years or so and hope the lithium's have plunged by then.

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@Manie. To use 1 bank of 48v and cycle hard and hope that there is a cost effective 20 year new generation battery in 3 or 4 years when they are tired or 2 x 48v strings that could ne good for 10 years or more is the decision to be made.

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9 minutes ago, Gerald_db said:

... cost effective 20 year new generation battery in 3 or 4 years ...

My gut feel says 10-20 years, measuring against me saying same 5 years back.

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My gut feel says 10-20 years, measuring against me saying same 5 years back.

I also simply do not see this happening. The "man" has too many vested interests in this not happening. [emoji85] [emoji86] [emoji87]

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@Manie. To use 1 bank of 48v and cycle hard and hope that there is a cost effective 20 year new generation battery in 3 or 4 years when they are tired or 2 x 48v strings that could ne good for 10 years or more is the decision to be made.

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Hi Gerald did you have a look at the lead crystals. I know it is expensive but you can get alot more cycles out of the batteries and its very save. You can cycle it alot deeper that other batteries.

I see at pv out that extra pannels makes a huge difference. Well done. What type/makes batteries do you have?

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13 hours ago, Manie said:

Deltec

Careful. Cycle life on the Deltec is much lower than on the Betta Battery. Consult with the spec sheets. I may be wrong, but the last time I checked the Deltecs were somewhat disappointing, hardly doing much better than our benchmark Trojan :-)

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9 hours ago, Manie said:

Seems Deltec is the better one

What numbers are you seeing? It's quite likely that I have the wrong end of the stick, this is just what I remember. I saw the price and cheered up, then I saw the cycle life and lost all that cheer. Let me see if I can find it again.

<insert Saxopohone music here>

Here we go... http://www.battery-pmp.co.za/Deltec-Lead-Crystal-Batteries.pdf

Page 5, second chart on the left. Around 1600 cycles to 50%. Same as Trojan T105RE.

<Insert more Kenny G here>

http://www.solarsolved.co.za/datasheets/batteries/Deltec/Lead_Crystal_6_CNFJ_200.pdf

Page 2, second chart down on the right. Around 3200 cycles to 50%. That's double.

If there is another spec sheet I should see, please send it to me. The above two are the reason I dismissed the Deltec as a possible option.

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So basically, if you can get me 3000 cycles at less than 7k, the math is as follows:

12*200*0.5*3000 = 3600 kwh over lifetime

7000/3600 = Less than R2 a kwh (without even doing the math)...

If it can only do half that cycle life, then price is over R3 per kwh and lead acid wins.

:-)

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Deltec is an official distributor of Lead Crystal batteries in South Africa. Instead of having a Betta Batteries label, they are re-branded to display Deltec's logo as they are an official supplier. Deltec's data sheet is however incorrect if I am not mistaken (they have been notified). Rather get your data sheets from the Lead Crystal website. You will also see Deltec's details under the Africa distribution link.

http://leadcrystalbatteries.com/distribution/distributors-in-africa/

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