Techniques and systems for settling over-the-counter financial instruments includes sampling over a periodic interval are disclosed. The control includes enhancements for MPPT and regulating the inverter output-current that is sourced into the utility grid. Accordingly, before data written on an adjacent track can be damaged by the ATE effect, data is rewritten and safely preserved. Magnetic connectors affixed on the modules facilitate inter-modular structural connection. At higher transmit power levels, minimum or zero data rates are chosen to maintain sufficient power for simultaneous voice.