Wait...
Shouldn't the BMS be monitoring the cell voltage all the time?
If the BMS is watching for a low cell voltage of 2.5V on all cells, then shouldn't you be fine?
Even with cells tied in parallel at the low level, all the voltages would be the same. If you had one really weak cell, I would expect it to either bring down the whole set, or maybe "charge" off the other cells in that group. Either way, when the voltage gets to the minimal threshold, the BMS should shut off power. Right?
John
On Monday, September 17, 2018, 11:25:27 AM CDT, clh5_98@yahoo.com [electricboats] <electricboats@yahoogroups.com> wrote:
James,
great info. I've often pondered what you described. If one sets their battery monitor for the bank capacity when the batteries are new and routinely discharge to say 50%, over time as the batteries age they will become more deeply discharged than 50%. This would eventually lead to complete failure at some point. Ideally the battery monitor would self compensate for the natural loss of battery capacity over time. Of course this would be a fairly complex calculation due all the variables involved in battery capacity loss.
You also mentioned taking the NSB to 20% SOC. Is this something you routinely do, and in your experience how do they hold up? As I currently have Trojan 520 ah X 50% capacity, being able to take the NSB to 400 ah X 80% would increase my range quite a bit. After really analyzing my options and my space/budget available, anything I do tends to decrease my range and cost more than what I currently have onboard. Ignoring the elusive Lead Crystal battery (which would be ideal for me), being able to cycle the NSB to 20-30% SOC would maintain my current range, or increase it at not too much of a higher cost over the Trojans, and a lot less than Lithium. I realize the deeper discharges would negatively impact the battery life, but how much, and is it worth it?
Chris
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Posted by: oak <oak_box@yahoo.com>
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