temperature. If the total duration of operation required is higher than 10 hours, more energy has to be installed, and so it becomes possible to use several on the shelf batteries, or to us “low rate" type batteries, which type and size could be tailored to adjust voltages, capacities, type of lithium couple, to optimize the power source with regard to power conditioning, experiment...... 4.3 Saft's recommended solution. Saft, looking only at the power sources problems, recommends, to satisfy the requirement of a simple, low cost, short delay solution, to consider the following: Select an Unmanned platform. It corresponds to Ariane Missions. Select the on the shelf battery which is able to deliver 2000 W peak power if necessary. If mission has to be longer, use several on the shelf batteries sequentially, instead of use low rate batteries, because if low rate batteries are selected at the beginning of such an exploratory program, power will be definitively limited and experience shows that users still requires more and more power during a development phase ! With a “low rate” battery, the only solution will be to increase the size and energy of the battery, and also its mass with impact on launch capability, or to reduce the objective of power to be transmitted by Powersat. The other good reason to propose to use sequentially the batteries, is that in this case, experiment could be spread on an unlimited period of time, the second battery could be discharged up to several years after the first one. which is very different and much better than to interrupt the discharge of a battery for a long period of time, with the risk of restart difficulties.
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