i_are_smart
Joined 11 years ago
Joined 11 years ago
I do it this way because it allows me to keep all of my experience and history in one single place, while also making it easy to create reduced subsets tailored to specific jobs.
Guess how I figured that one out.
Most lithium chemistries have a nominal voltage near 3.3 - 3.7V per cell.
When you stack lithium cells in series for any sort of high-performance application, you need additional balancing circuitry to bleed off energy from the cells individually (tiny variations between cells results in them having different capacities, which means some will charge up at different rates, resulting in them DISCHARGING at higher rates, which results in pretty serious negative effects for the life of the battery pack). The only exception here is extremely well matched cells, which is how Tesla is able to get away with not using much balancing circuitry (they are very picky about the cells they use, and have enough cells in stock to pick ones with very similar capacities).
And the safety features include a lot more than fuses - there are over-voltage protection circuits (extremely important!), over-discharge protection circuits, temperature protection circuits (you can overheat a cell even without drawing too much power out of it).
In short, large stacks of lithium cells are a difficult and dangerous beast to handle, and a lot of work goes into keeping them safe. These cells tend to have very low internal impedance, and as a result a chain of them can produce staggering amounts of power.
Source: I work on the embedded protection systems for a company which makes specialty lithium-ion battery systems for industrial, aerospace, and defense customers.
[1] http://www.citronresearch.com/citron-exposes-ubiquiti-networ...
Well, not immediately fatal, anyway. What if a gene modification is developed that halves the rate of aging? Is it a birth defect to have a maximum life expectancy of only 120 years instead of 200 years?
Frankly, I would NEVER install such a device in my house. The engineering on many is (almost?) criminally flawed.
Simple connect to one, and then overwrite the boot partition. Or rm -rf /. Or even just use the firewall to block all inbound and outbound connections (an IP camera isn't very useful if you can't view the feed).
I could easily see them exceeding this limit, if they were using an older version of excel.
Alternatively, even the new versions of excel enforce the 2^16 row limit if working on a .xls file instead of a .xlsx file.