Hi guys dont find this onsite but wanted to know is it worth it to spend R100K for a 48v bank made of 12x2v@900ah

Compared to R50k 48v bank made of 16x12v@230ah (920ah)

Thanks

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It all boils down to number of cycles. I would not invest too heavily in batteries. I am privy to something I cannot divulge so hopefully I can tell you in the New Year.

 

1 hour ago, Chris Hobson said:

It all boils down to number of cycles. I would not invest too heavily in batteries. I am privy to something I cannot divulge so hopefully I can tell you in the New Year.

 

Interesting... Hint? New tech or alternative to battery?

1 hour ago, Chris Hobson said:

It all boils down to number of cycles. I would not invest too heavily in batteries. I am privy to something I cannot divulge so hopefully I can tell you in the New Year.

 

Ja Chris, kom gee ons iets om oor te dink die vakansie

There was a recent breakthrough with supercap batteries.

8 minutes ago, HeinTheTerrible said:

There was a recent breakthrough with supercap batteries.

Hmmm... Please go on....

http://www.express.co.uk/news/science/740174/Battery-breakthrough-supercapacitor-technology-revolutionise-mobile-phones-electric-cars

that's the one link I found

Price per kwh stored is all I care about. If the cycle life is similar, go with the 12V one seeing as it is cheaper :-)

@plonksterThere's actually a guy in your area that sell those Narada 12v 200ah batteries for cheap. R1200 per batt when I last checked and they were basically a year old.

Or just go with a Telsa Powerwall 2. Rand per kWh and 10-year warranty will beat almost any 2v/12v battery bank with the same (usable) capacity.

1 minute ago, Johann1982 said:

@plonksterThere's actually a guy in your area that sell those Narada 12v 200ah batteries for cheap. R1200 per batt when I last checked and they were basically a year old.

1. They are not stolen Vodacom batteries?

2. PM me his details! :-)

Hahahaha.. no he has papers for them. I also thought they were stolen at first. 

3 hours ago, HeinTheTerrible said:

Or just go with a Telsa Powerwall 2. Rand per kWh and 10-year warranty will beat almost any 2v/12v battery bank with the same (usable) capacity.

but you can't use the Tesla Powerwall 2 with an Axpert, Victron or Infinisolar inverter, and that's where the whole setup gets very expensive 

15 minutes ago, SilverNodashi said:

but you can't use the Tesla Powerwall 2 with an Axpert, Victron or Infinisolar inverter, and that's where the whole setup gets very expensive 

Just wait and see...

Speak to @Chris Hobson I am sure he knows how to run lithium batteries off an Axpert.

10 minutes ago, Johann1982 said:

Speak to @Chris Hobson I am sure he knows how to run lithium batteries off an Axpert.

 You can run lithium batteries on almost any charger/inverter, you just need to change the charger settings.

20 minutes ago, SilverNodashi said:

but you can't use the Tesla Powerwall 2 with an Axpert, Victron or Infinisolar inverter, and that's where the whole setup gets very expensive 

I think the problem probably has to do with how it is packaged. I believe the current solutions (with Solar Edge and SMA) uses a high-voltage setup, so it integrates directly with these inverters that require a high input voltage.

But in the end it's just a lithium battery and there should be no reason why you cannot package it to make a 48V bank. Well, that is not exactly true either, we all know there are challenges in using parallel strings, so a straight reconfiguration is probably not ... well... straight forward.

But then, Tesla aren't the only people who make Lithium batteries either (Just like Apple aren't the only people who make smart phones... duuuh). Victron makes these Eco-multi things... if you really want to go that way :-)

Just now, plonkster said:

I think the problem probably has to do with how it is packaged. I believe the current solutions (with Solar Edge and SMA) uses a high-voltage setup, so it integrates directly with these inverters that require a high input voltage.

But in the end it's just a lithium battery and there should be no reason why you cannot package it to make a 48V bank. Well, that is not exactly true either, we all know there are challenges in using parallel strings, so a straight reconfiguration is probably not ... well... straight forward.

But then, Tesla aren't the only people who make Lithium batteries either (Just like Apple aren't the only people who make smart phones... duuuh). Victron makes these Eco-multi things... if you really want to go that way :-)

Yup. The interface PCB will only with Solar Edge and SMA. At least, in South Africa. You might be able to make it work with other inverters but would void the warranty. That's if you can get a local distributor who will sell you the battery alone. Alternaive options include the Freedomwon and BlueNova

25 minutes ago, SilverNodashi said:

Freedomwon

I know them... The bms-bridge code on github... that was specially for them

12 hours ago, Johann1982 said:

Interesting... Hint? New tech or alternative to battery?

New tech which will do away with the need for battery storage. Generate power as you need it.

7 hours ago, Johann1982 said:

Speak to @Chris Hobson I am sure he knows how to run lithium batteries off an Axpert.

Sjoe I am being given credit far beyond my knowledge base. The Aussie Axpert lads almost all run on Lithium. The have a separate BMS to prevent over-charging. If I was running Lithium batteries I definitely would be using Coulomb's patched firmware. 

7 hours ago, HeinTheTerrible said:

 You can run lithium batteries on almost any charger/inverter, you just need to change the charger settings.

Essentially Lithium does not need a complicated charge algorithm charge to set voltage which is also float voltage.

47 minutes ago, Chris Hobson said:

New tech which will do away with the need for battery storage. Generate power as you need it.

Advanced donkey boiler driving steam turbine and genny... guessing here...

 

1 hour ago, Chris Hobson said:

New tech which will do away with the need for battery storage. Generate power as you need it.

Hi Chris, I think I am going to come and spy on your farm to see how you store your enengy these days. You've got me all curios now.

7 hours ago, Groenkaroo said:

 

Hi Chris, I think I am going to come and spy on your farm to see how you store your enengy these days. You've got me all curios now.

No need! Not even I have it yet. As soon as I can I will announce it from the rooftops. Every person on this forum is a potential user, as is every farmer whom Eskom has by the short and curlies. My one fear is demand will outstrip supply for several years. I suppose the market will quickly solve that with several manufacturers coming on board to meet demand.

9 hours ago, Mark said:

Advanced donkey boiler driving steam turbine and genny... guessing here...

You obviously are up to speed with my "boer-maak-'n-plan".