Does battery weight matter?

an old telephone use to have a weight inside of them.
china shop batteries is lighter than other once's.
 
Lead acid lifespan can be measured in years if used right. Key is to massively oversize vs lithium. Where 20 Ah lithium will do you might need 50+ Ah lead acid to get comparable cycle life.

If lead acid is still the cheaper option in a fair comparison go for it.
 
Tomtomtom said:
Lead acid lifespan can be measured in years if used right. Key is to massively oversize vs lithium. Where 20 Ah lithium will do you might need 50+ Ah lead acid to get comparable cycle life.

If lead acid is still the cheaper option in a fair comparison go for it.
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It isn't though. Lead Acid is around 1:1 price wise for usable capacity.

i.e. Lithium is about twice the price of Lead Acid. Why bother with inferior product with a lower lifetime.
 
itareanlnotani said:
It isn't though. Lead Acid is around 1:1 price wise for usable capacity.

i.e. Lithium is about twice the price of Lead Acid. Why bother with inferior product with a lower lifetime.
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As I say it's not a lower lifetime when you properly size for DoD. And a lot of new lithium are going to surprise on the downside in 2-3 years.

There is also factors like the time value of money, discount rate, opportunity cost and whatnot to consider. Then in big installations there's also safety. It's only the beginning in terms of massive lithium fires.

I'm just saying there might still be rational reasons to go lead acid. In my case I'm running a "dead" car battery 3 years now as a router UPS. Long lasting and cheap.

But ja obviously more common than not people are falling for a false economy, especially when it's a scam like OP's "200 Ah"

Buy cheap buy twice.
 
Was not looking into buying them, just browsing around.

Just had a look at how many scam sites there are popping up and scam batteries on google ads.

That is why I asked about the weight, the best part is that battery is not even a cheap one.
 
I reckon weight might be one of the best indicators of quality for lead acid as it's a denser metal than e.g. steel so it'd be hard to fake.
 
Tomtomtom said:
And a lot of new lithium are going to surprise on the downside in 2-3 years.
Click to expand...

Tomtomtom said:
It's only the beginning in terms of massive lithium fires.
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You are using a lot of unproven statements as fact to argue your point. Do you have a crystal ball that the rest of us do not know about?

Last time I checked LFP batteries have a very high tolerance for heat and even puncturing then does not cause runaway reactions. NMC is another story but most manufacturers are or have already moved away from this. And then you say nothing about the gasses released by LA when charging that can also cause explosions and causes health risks.

Increasing the bank size, as you recommend for LA batteries causes a whole lot of other issues, like space, extra cabling (more cost) needing a substantially larger PV array to charge up those extract AH in the oversized bank leading to extra cost (or if you are not using PV you will be adding to your Eskom bill).
 
Koosvanwyk said:
You are using a lot of unproven statements as fact to argue your point. Do you have a crystal ball that the rest of us do not know about?
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Jeepers you must have a large investment in lithium to defend?

I'm not hating on it at all, I just think people shouldn't hate so hard on lead acid either. It has its place, one just needs to understand the trade offs due to different chemistry and the major one is that 1Ah lithium != 1 Ah lead acid.
 
Tomtomtom said:
Lead acid lifespan can be measured in years if used right. Key is to massively oversize vs lithium. Where 20 Ah lithium will do you might need 50+ Ah lead acid to get comparable cycle life.

If lead acid is still the cheaper option in a fair comparison go for it.
Click to expand...
Quite right.

When I installed solar pv a decade ago lithium-iron was at least double its current price in relative terms, so I went for a bank of 48 x 105Ah lead acid batteries. With proactive management of major power gulpers like geysers, this was large enough to carry us through a decade of power cuts while keeping DoD within 25%, usually less.

In the past few years we've spent more time abroad and so gradually lost control of managing DoD. The house was occupied by friends and family, and expecting them to manage DoD was just too big an ask. On a few occasions earlier this year the batteries were run right down, with unsurprising consequences.

Still, the lead acids served me well for over a decade, and I have no regrets. Just size it right so DoD is optimised for that chemistry.

In September I sold off the 48 lead acid batteries and switched to the Pylontech lithium-irons.
 
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Arthur said:
Quite right.

When I installed solar pv a decade ago lithium-iron was at least double its current price in relative terms, so I went for a bank of 48 x 105Ah lead acid batteries. With proactive management of major power gulpers like geysers, this was large enough to carry us through a decade of power cuts while keeping DoD within 25%, usually less.

In the past few years we've spent more time abroad and so gradually lost control of managing DoD. The house was occupied by friends and family, and expecting them to manage DoD was just too big an ask. On a few occasions earlier this year the batteries were run right down, with unsurprising consequences.

Still, the lead acids served me well for over a decade, and I have no regrets. Just size it right so DoD is optimised for that chemistry.

In September I sold off the 48 lead acid batteries and switched to the Pylontech lithium-irons.
Click to expand...
Weren't you on the 2v trojans though?
Not quite the same price level as the average dead acid, even at the time.


Took you long enough to move to Lithium :)
 
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