more on Tesla battery packs
Hi, Well there is at least one source of supply outside of Tesla. first item on the list.
Forum Discussion
Hi Mex,
It is not clear that the powerwall unit can be stand alone with no grid tie.
For me, it has several strikes against it.
First the inability to charge below -20 c (-4 f). That is a deal breaker for me.
Second the price of the 10 k unit plus inverter is apparently going to be 7400 plus 2000 for the inverter.
Third, one would have to find an installer willing to work to modify the unit to be installed horizontally in an RV (under the bed does NOT appeal to me).
Fourth, LiPo (which, admittedly, is a different chemistry) is showing loss of capacity due to heating. The technomedia folks are down about 25% from their original capacity of 500 amp-hours after 3.5 years of use. It looks as if 43 C (110 F) is too hot for LI chemistries to handle.
Fifth, it is becoming clear that Li batteries do NOT like being floated at 100%. They are happiest if they are bouncing between 85 to 95%.
Sixth, the suggested charging voltages have dropped down to 13.8 for maximum cycle life. So much for being able to "shove" current into them rapidly.
Seventh, Musk says he has orders for powerwall units that will keep his not yet existent factory busy for 18 months.
Eighth, Li cell prices have not dropped at all in the last four years.
Ninth, until recently large capacity (500 amp-hours per cell, and up) have not been available. Now that they are, for someone in areas where temperatures are moderate, it may make sense--but not yet financially.
My feeling is that Musk is trying to stifle other cheaper battery chemistries by jumping in to monopolize the market. Of particular interest is a new Aluminum based battery than can be rapid charged at rates of 1000 C, (if you can find big enough conductors and a power source, that is!).
I need batteries I can use in the next year. I may try to delay that to a trip south, and I'll most likely go to AGM. It is so far down to the ground these days, and my experience with battery watering systems was a total flop. DAMHIK *grin*
It is not clear that the powerwall unit can be stand alone with no grid tie.
For me, it has several strikes against it.
First the inability to charge below -20 c (-4 f). That is a deal breaker for me.
Second the price of the 10 k unit plus inverter is apparently going to be 7400 plus 2000 for the inverter.
Third, one would have to find an installer willing to work to modify the unit to be installed horizontally in an RV (under the bed does NOT appeal to me).
Fourth, LiPo (which, admittedly, is a different chemistry) is showing loss of capacity due to heating. The technomedia folks are down about 25% from their original capacity of 500 amp-hours after 3.5 years of use. It looks as if 43 C (110 F) is too hot for LI chemistries to handle.
Fifth, it is becoming clear that Li batteries do NOT like being floated at 100%. They are happiest if they are bouncing between 85 to 95%.
Sixth, the suggested charging voltages have dropped down to 13.8 for maximum cycle life. So much for being able to "shove" current into them rapidly.
Seventh, Musk says he has orders for powerwall units that will keep his not yet existent factory busy for 18 months.
Eighth, Li cell prices have not dropped at all in the last four years.
Ninth, until recently large capacity (500 amp-hours per cell, and up) have not been available. Now that they are, for someone in areas where temperatures are moderate, it may make sense--but not yet financially.
My feeling is that Musk is trying to stifle other cheaper battery chemistries by jumping in to monopolize the market. Of particular interest is a new Aluminum based battery than can be rapid charged at rates of 1000 C, (if you can find big enough conductors and a power source, that is!).
I need batteries I can use in the next year. I may try to delay that to a trip south, and I'll most likely go to AGM. It is so far down to the ground these days, and my experience with battery watering systems was a total flop. DAMHIK *grin*
