Thanks heaps for that -do I need a sine wave inverter to run the charger or will a cheaper square wave one do? My question with the cells is -are you better off with lots of smaller cells in parallel (eg50a/h) then four lots of them in series or just 4 of the one bigger cell (eh 100a/h)?
I'll be back for more thanks Terry.
Lithium Batteries, who has them?
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Re: Lithium Batteries, who has them?
You will need 16 100Ah cells to to make 12v at 400Ahcampingnut wrote:Thanks heaps for that -do I need a sine wave inverter to run the charger or will a cheaper square wave one do? My question with the cells is -are you better off with lots of smaller cells in parallel (eg50a/h) then four lots of them in series or just 4 of the one bigger cell (eh 100a/h)?
I'll be back for more thanks Terry.
Regards Geoff
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Re: Lithium Batteries, who has them?
Now we come to the conundrum (A logical postulation that evades resolution, an intricate and difficult problem)campingnut wrote:Thanks heaps for that -do I need a sine wave inverter to run the charger or will a cheaper square wave one do? My question with the cells is -are you better off with lots of smaller cells in parallel (eg50a/h) then four lots of them in series or just 4 of the one bigger cell (eh 100a/h)?
I'll be back for more thanks Terry.

I finally found the photos

This is a 1200Ah pack of GBS cells in a boat
this is a 4 cells in series 200Ah @ 12v battery, note this strapping method
This is also a 200Ah @ 12v made of from 8 x 100Ah cells in parallel/series. Note the way these were strapped and how the linking connectors are fitted to build the parallel/series battery.
T1 Terry
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A person may fail many times, they only become a failure when they blame someone else John Burrows
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves
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Re: Lithium Batteries, who has them?
Geoff has a really tidy battery box, I went with 8 cells for my 400ah as it fitted the space available, 8x 200ah cells, 4prs
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Pace Arrow. La de da, property in two continents..
Pace Arrow. La de da, property in two continents..
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Re: Lithium Batteries, who has them?
Thanks pope and Terry -I might have access to a number of 60a/hr and was thinking to do four sets (hooked up in series made up of four cells in each lot in parallel) Total of 12v with 240 a/hr -going to run a 40 litre freezer -500 watts of panels (well in name lol)
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Re: Lithium Batteries, who has them?
Here's something for the lithium folk:
http://www.news.com.au/technology/gadge ... 7090950619
http://www.news.com.au/technology/gadge ... 7090950619
Steve Williams
http://stevew1945blog.com/
Every absurdity has a champion to defend it.
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http://stevew1945blog.com/
Every absurdity has a champion to defend it.
Oliver Goldsmith. 1728 -1774
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Re: Lithium Batteries, who has them?
If it's the 2 min charging article, my reply to it is here http://www.caravanersforum.com/viewtopi ... b6#p743885 Might be good for a phone or an I pad etc, but not in the hunt for an electric vehicle and of no advantage for house power storage.SteveW wrote:Here's something for the lithium folk:
http://www.news.com.au/technology/gadge ... 7090950619
T1 Terry
A person may fail many times, they only become a failure when they blame someone else John Burrows
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves
Those who struggle to become a leader, rarely know a clear direction forward for anyone but themselves
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Re: Lithium Batteries, who has them?
My bit for today was updating a the Friday post with some photos. I'll get back to adding more info posts tomorrow, headaches willing of course
T1 Terry
T1 Terry
A person may fail many times, they only become a failure when they blame someone else John Burrows
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Re: Lithium Batteries, who has them?
Jeez some of those black cells look familiar...................
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Suzuki GV more than ready to go NOW !
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Re: Lithium Batteries, who has them?
Steve, there has been a couple of universities here in Aus that have been working on fast charging cells for a number of years. It all boils down to how charged electrons are accepted into the cell pack. Normally when charged electrons enter a storage system they are pumped in, with them all facing different directions and bounce around crashing into each other, slowing input and blocking entry of other electrons until they settle down. That's why slow charging is used so there is no stress or confusion within the cell and electrons flow freely. What they are doing is trying to get the electrons flowing easily in line into the storage at very fast rates.SteveW wrote:Here's something for the lithium folk:
http://www.news.com.au/technology/gadge ... 7090950619
Put simply, it's like trying to fill a 1lt narrow necked bottle with a fire hose, you can fill a big open 100lt tank with it quicker. The aim is to use the fire hose to fill the bottle without resistance and blow back at the same rate as the open tank. To do that they have to get the electrons all facing the same way lined up so they simply flow in very rapidly.
The people who make my BMS, already have a 4 seater 4x4 test vehicle which has a usable range of over 1000 klms, using regenerative braking and a body made up of Kevlar/carbon fibre impregnated with solar cells. It has a top speed of over 160klms. They have a system which can charge their cell packs in 15 minutes, but it is cumbersome and relies upon large capacitors that adsorb electrons blocking the way into the cell. When the pack gets near full charge, the charge switches off and capacitors slip them back into the pack. What they are aiming for is a different configuration of cell and chargers so they send and accept the electrons all lined up nicely together, like a piece of string and not randomly as is the case now. When you drop the string of electrons into the cell, it stays in line and fills very quickly, much faster than trying to stuff them in willy nilly as they do now. They also use capacitors to store regenerative and solar cell energy in the vehicle, which dribbles into the cells when there's not enough charge from sunlight. So the vehicle can run even further and into the night.
When it comes to off grid, this will mean whatever amount of energy you can produce, your storage system will take it, so during the day you have almost unlimited energy to play with. If you have tracking panels, you have kilowatts of energy to use for many hours to run workshops, machinery etc and still have 100% at night. The same goes for RV, if you have say a 60 amp input capacity you can run anything during the day and not worry about getting low at night. As it's rare for RV's to have tracking systems, you won't get the full advantageous out of fast charging, but will certainly double your daily charge capacity easily.