Volta Li ion battery system
An interesting full system from Volta- consists of 48 volt battery packs, a 190 amp, 48 volt alternator, 48-12 volt dc-dc converters (150 and 250 amp) and a 3600 watt 48 volt inverter/charger. http...
Forum Discussion
Jaysus...
The issue is not the battery.
The issue is the lifespan / reliability of the monitor and control circuitry for each cell. Reliability or lack-of is a factor of multiples percentage failure rate. This is not portable radio territory - it is a high amperage high wattage environment.
When I assisted Frank Oropeza at Transpo Electronics with the design of the 911 series (PWM) ambulance alternator voltage regulator this was a ten ampere environment. The regulator could not be built for less than "X" amount of dollars. Only wave soldering selected components generated the high degree of reliability.
In that other thread read and read again the point about **BACKUP** FIELD EFFECT TRANSISTOR FAILURE DETECTION. It is there for a reason.
You EXPECT lithium battery prices to dramatically plunge. Well they can. But it will come at an awful price. Reliability. What the hell good is an accumulator that can withstand say three thousand cycles, yet end up with an cell interconnect control failure after say four hundred cycles?
With my tinkering I demand reliability. With my profession I uncovered unreliability. Failure to meet reasonable expectations.
Houston, we have a conflict.
Reliability versus cost
High reliability at low(est) cost.
And for those folks who try and establish a parallel between this battery technology and say solar voltaics - forget it. Slingshots versus cannons in perspective.
High amperage control is not just a discipline, it is an art form.
No matter how hard I look I cannot find reliable high voltage, high amperage components at a comparative cost in proportion to lesser rated devices.
Nor is there ANY published material that white papers control reliability for lithium ion. Now an EIGHT THOUSAND CYCLE LIFESPAN TEST requires X amount of time. I suggest doing the math. Then use your noodle.
I suspect a surprisingly high percentage of the high cost of today's lithium technology is tied up to monitoring and control.
Example is a special circuit mentioned that monitors components within the control circuitry.
And it's not a question of "wanting" this technology. It is here, now at a pricey expense.
And you want the cost to tumble. Soon and dramatically
And retain a reasonable degree of reliability. i.e. a cheap monitoring and control circuit every bit as good as on the high dollar lithium products.
It's nice to dream...
The issue is not the battery.
The issue is the lifespan / reliability of the monitor and control circuitry for each cell. Reliability or lack-of is a factor of multiples percentage failure rate. This is not portable radio territory - it is a high amperage high wattage environment.
When I assisted Frank Oropeza at Transpo Electronics with the design of the 911 series (PWM) ambulance alternator voltage regulator this was a ten ampere environment. The regulator could not be built for less than "X" amount of dollars. Only wave soldering selected components generated the high degree of reliability.
In that other thread read and read again the point about **BACKUP** FIELD EFFECT TRANSISTOR FAILURE DETECTION. It is there for a reason.
You EXPECT lithium battery prices to dramatically plunge. Well they can. But it will come at an awful price. Reliability. What the hell good is an accumulator that can withstand say three thousand cycles, yet end up with an cell interconnect control failure after say four hundred cycles?
With my tinkering I demand reliability. With my profession I uncovered unreliability. Failure to meet reasonable expectations.
Houston, we have a conflict.
Reliability versus cost
High reliability at low(est) cost.
And for those folks who try and establish a parallel between this battery technology and say solar voltaics - forget it. Slingshots versus cannons in perspective.
High amperage control is not just a discipline, it is an art form.
No matter how hard I look I cannot find reliable high voltage, high amperage components at a comparative cost in proportion to lesser rated devices.
Nor is there ANY published material that white papers control reliability for lithium ion. Now an EIGHT THOUSAND CYCLE LIFESPAN TEST requires X amount of time. I suggest doing the math. Then use your noodle.
I suspect a surprisingly high percentage of the high cost of today's lithium technology is tied up to monitoring and control.
Example is a special circuit mentioned that monitors components within the control circuitry.
And it's not a question of "wanting" this technology. It is here, now at a pricey expense.
And you want the cost to tumble. Soon and dramatically
And retain a reasonable degree of reliability. i.e. a cheap monitoring and control circuit every bit as good as on the high dollar lithium products.
It's nice to dream...
