摘要 |
In one embodiment, an apparatus includes a housing. The housing includes one or more units where each unit includes one or more optical elements. The optical elements are configured to concentrate electromagnetic radiation, such as light, from a larger area to a smaller focused area. The optical elements may be sealed in the housing. A removable device is included that is configured to be inserted into a unit. The removable device includes a photovoltaic cell that is configured to receive at least a portion of the concentrated electromagnetic radiation. The removable device is configured to be removable from the housing from a second side of the housing without breaking the seal on the first side of the housing. Accordingly, when the removable device needs to be removed, it can be removed without breaking the seal on the first side of the housing.
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