Daddy Tanuki
Solar Wizard
having used CALB nylon cells for the last couple of years, I wanted to upgrade my banks size.
I am not really all of that impressed with EVE an the other aluminum cased cells. seems like a bunch of scrabbling around trying to save $5.00 with a very variable end result.
Now some of this can be laid at the foot of the builder, but a lot of it to me anyway seems to be the fault of the cell provider. it seems the aluminum cased cells are a lot more fragile than the nylon cased cells
as Calb are no longer produced in the nylon cell, I had to ask my self are Winstons still worth the initial cost. they have several advantages. they can be charged according to winston safely at .25c down to -25°C which means I would not need to build a battery warmer for this pack. (for my location). this means one less persnickety sub system to monitor.
7000 cycles and winston's legendary reliability. the difference in cost as currently quoted is almost exactly half. $1.00 / amp hour for Winstons brand new TSWB-YLP400AH which is 1430 watt hour or 400 amp hour according to their generic sales spec sheets. Vs .48 for eve From Amy. This price is according to Winston's sales reps. with an actual winston email address. (all sizes are available new, 50~1000) the only variance being delivery time depending upon what they are producing in the factory at that time.
"Our battery's applicable temperature is -45°c~85°c. And the preferred temperature for charging and discharging we recommend is 25°c."
think, (know) that I would calendar age them prior to cycle killing them. nylon cases, no special dividers no compression devices needed, no special heating or cooling systems needed (for my location.) the only question is charging voltage, floating voltage etc. they are rated from the voltage of 2.8-3.8 so it seems to me that the standard top balance to 3.65 and a 3 volt cutoff would probably be a good place to start.
any thoughts? questions? concerns?
I am not really all of that impressed with EVE an the other aluminum cased cells. seems like a bunch of scrabbling around trying to save $5.00 with a very variable end result.
Now some of this can be laid at the foot of the builder, but a lot of it to me anyway seems to be the fault of the cell provider. it seems the aluminum cased cells are a lot more fragile than the nylon cased cells
as Calb are no longer produced in the nylon cell, I had to ask my self are Winstons still worth the initial cost. they have several advantages. they can be charged according to winston safely at .25c down to -25°C which means I would not need to build a battery warmer for this pack. (for my location). this means one less persnickety sub system to monitor.
7000 cycles and winston's legendary reliability. the difference in cost as currently quoted is almost exactly half. $1.00 / amp hour for Winstons brand new TSWB-YLP400AH which is 1430 watt hour or 400 amp hour according to their generic sales spec sheets. Vs .48 for eve From Amy. This price is according to Winston's sales reps. with an actual winston email address. (all sizes are available new, 50~1000) the only variance being delivery time depending upon what they are producing in the factory at that time.
"Our battery's applicable temperature is -45°c~85°c. And the preferred temperature for charging and discharging we recommend is 25°c."
think, (know) that I would calendar age them prior to cycle killing them. nylon cases, no special dividers no compression devices needed, no special heating or cooling systems needed (for my location.) the only question is charging voltage, floating voltage etc. they are rated from the voltage of 2.8-3.8 so it seems to me that the standard top balance to 3.65 and a 3 volt cutoff would probably be a good place to start.
any thoughts? questions? concerns?