A photovoltaic module 1 has strings 5 of solar cells 3. The solar cells 3 are connected in series, and the strings 5 are electrically isolated from each other. A junction box 17 is electrically connected to each string 5. Each junction box 17 provides an external output for electricity generated by the connected string 5. Each junction box 17 may have a bypass diode 9, a cable 19 and connector pair 21. Electronic appliances or components, such as batteries, may be connected to each junction box 17, for off-grid (off-the-grid, OTG) power supply or charging. The solar cells 3 may be wafer based silicon cells, spaced apart but connected with metallic interconnectors 7 or wires. A housing encloses all of the strings 5, and may be a glass-backsheet or glass-glass superstrate.
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