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Cabinet

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Power budget

≈9 mWaverage

≈0.22 Whper day

5.4 Wpdarkest week

Modem reachable at 1.28 s paging. Up from 7.7 mW: the OV cut-off and three permanent dividers add ≈1 mW, the 3.47 V rail ≈0.3 mW. Darkest week: 0.22 ÷ 0.0402 Wh/Wp/day ≈ 5.4 Wp vertical panel (≈3.5 Wp at 30° tilt); plan ≥10 Wp. A 7 Ah lead-acid battery lasts ≈95 days without sun; below 10.7 V the UVLO leaves ≈1 mW. Unknown: the existing charge controller's own draw.

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Cabinet, enclosure and board sizes are estimates from photos. Not the KiCad layout.