We present two Suzaku observations of the Galactic center microquasar 1E 1740.7-2942 separated by approximately 700 days .
The source was observed on both occasions after a transition to the spectrally hard state .
Significant emission from 1E 1740.7-2942 is detected out to an energy of 300 keV , with no spectral break or turnover evident in the data .
We tentatively measure a lower limit to the cut-off energy of \sim 380 keV .
The spectra are found to be consistent with a Comptonized corona on both occasions , where the high energy emission is consistent with a hard power-law ( \Gamma \sim 1.8 ) with a significant contribution from an accretion disc with a temperature of \sim 0.4 keV at soft X-ray energies .

The measured value for the inner radius of the accretion disc is found to be inconsistent with the picture whereby the disc is truncated at large radii in the low-hard state and instead favours a radius close to the ISCO ( R _ { in } \sim 10 - 20 ~ { } R _ { g } ) .