My Blue Smart IP67 12/25 Charger housing reaches 140 degrees F (as measured with one of those laser temp guns) when charging my 100AH LiFePO4 battery at 25A for an extended period. Pretty much too hot to touch. Ambient temp perhaps 77 degrees. Is this expected and normal? Charging has worked fine for a number of cycles, but I'm nervous about premature failure due to excessive heat.
I didn't realize that 8% inefficiency (the corollary of 92% efficient) could generate this much heat. Not being trained in this area, I don't know how to calculate expected heat generation from power conversion inefficiency.
