Solar Array Power Conditioning
Solar Cell String-Level Power Conditioning Electronics
Solar cell string-level power conditioning electronics are power converters that transform raw, variable-voltage output from solar cell strings into a regulated bus voltage with maximum power extraction. On the lunar surface, these exposed electronics must operate across severe temperature extremes ranging from -173 °C to +127 °C and survive recurring 336-hour dark periods without damage. The hardware incorporates radiation-hardened controller ICs, gallium nitride transistors, and blocking diodes to tolerate ambient radiation and prevent nighttime reverse currents, while adaptive maximum power point tracking algorithms adjust for gradual solar cell degradation over decades.
String-level power electronics that condition raw solar cell output for the power bus
Purpose
Convert variable-voltage solar cell output to regulated bus voltage with maximum power extraction
Context
Child of L2-PWR-SOL within the Lunar Ark power generation system
Principles
- ▸Bypass diodes prevent hot-spot damage from shaded or failed cells in series strings
- ▸String-level MPPT optimizes power extraction from each string independently
- ▸Blocking diodes prevent reverse current flow through illuminated strings at night
- ▸Current limiting protects downstream electronics from fault conditions
Typical implementations
- ▸Space-grade GaN power converters for high-efficiency DC-DC conversion
- ▸Emcore/SolAero solar array regulators for satellite applications
- ▸Microchip rad-hard MPPT controller ICs
- ▸Linear Technology (Analog Devices) space-grade power management ICs
Lunar considerations
- ▸Radiation damage to power electronics requires rad-hard components or shielding
- ▸Wide temperature operation range required (-173C to +127C) for exposed electronics
- ▸Must handle 336-hour dark period gracefully without damage
- ▸Gradual solar cell degradation over decades requires adaptive MPPT algorithms
Specifications
Functional
| primary function | String-level power electronics that condition raw solar cell output for the power bus |
Physical
| materials | GaN transistors, Ceramic capacitors, Ferrite inductors, Rad-hard controller ICs |
Interfaces
Provides
- Conditioned DC power from solar strings
Requires
- Raw solar cell string voltage and current
Cite this entry
Lunar Ark Codex. "Solar Array Power Conditioning" (L3-PWR-SOL-COND). Retrieved 10 September 2026, from https://lunarark.com/entry/L3-PWR-SOL-COND
Licensed CC-BY-SA 4.0. You may reuse and adapt this entry with attribution, under the same licence.