  We present a new way of describing the flares from Sgr A* with a
self-consistent calculation of the particle distribution. All relevant
radiative processes are taken into account in the evolution of the electron
distribution and resulting spectrum. We present spectral modelling for new
X-ray flares observed by NuSTAR, together with older observations in different
wavelengths, and discuss the changes in plasma parameters to produce a flare.
We show that under certain conditions, the real particle distribution can
differ significantly from standard distributions assumed in most studies. We
conclude that the flares are likely generated by magnetized plasma consistent
with our understanding of the accretion flow. Including non-thermal
acceleration, injection, escape, and cooling losses produces a spectrum with a
break between the infrared and the X-ray, allowing a better simultaneous
description of the different wavelengths. We favour the non-thermal synchrotron
interpretation, assuming the infrared flare spectrum used is representative. We
also consider the effects on Sgr A*s quiescent spectrum in the case of a
density increase due to the G2 encounter with Sgr A*.
