The LiFePO4 only got popular in the past few years when it became cheap enough to attract enough people to it. The LiFeYPO4 from ThunderSky has only been around for a year or so. What I'm saying is, there is no long term experience for life expectancy at all. So far it seems that everyone with these cells has only lost them to overdischarge failures caused by either one specific kind of faulty electronics and a few people who didn't watch their pack, one in particular who didn't know how battery theory for cells in series works and killed multiple cells when he drove them to negative voltage. There is one specific case where there were 4 or 5 batteries that came from an older batch and were combined with a new batch when they were shipped and the older ones were clearly underperforming the rest.Ive read on the internet, that LiFeYPo4 batteries have more life expectance than the LiFePo4 ones.
But what about experience? I am sure that some of you folks have some!
What's the average voltage sag you guys see during a drive? I have 48 Thundersky 100ah and wanted to compare numbers.This morning temperature outside was near to freezing point. Charging was done yesterday and I had cold cells at same outside temperature.
While driving to work for about 40 Kilometers I recognized no significant change in voltage sag during accelation.
As it seems, the new Yttrium type Thundersky are much better at cold temperatures.
But we will see. More much colder nights are coming for sure.
I will report you in future
I don't think so. I only received data on Rs, not capacity, with my CALB cells. As far as I know JRP3 is the only one who received such complete data, and he has it for other cells sizes in addition to the size he ordered. In his case I think someone inadvertently left some paperwork in the box that was for internal use. At least I've not seen anyone else saying they received that info. I think it is also highly dependent on whether the middlemen pass it along.Are the T/S cells delivered with test/spec sheets for each cell showing capacity and internal resistance?.... I thought not. I believe the Calb cells are....
I was around and saw the posts before they got edited.Apparently Jack has had a run in with someone on likely this site and thus you don't see him much anymore. Said they edited his posts and that pissed him off! Don't blame him but not sure if it was indeed this site.