Elsys ERS Lite – RSSI & Battery Life

Drag to adjust RSSI -80 dBm

-120 dBm worse ←→ better -40 dBm

✓ Good -40 → -70 dBm

⚠ Acceptable -71 → -90 dBm

✗ Critical -91 → -120 dBm

Battery Life (per sensor)

—

estimated years

Battery Swaps / Year

—

out of 1,000 sensors

Battery Cost / Year

—

AA @ SEK 50

Total Cost / Year

—

incl. labour @ SEK 420/h

Battery Life vs RSSI — linear degradation (Elsys ERS Lite, AA, 15 min interval)

Timeline — when do you need to replace batteries?

Battery life—

Spreading Factor—

Swaps / year (1,000 sensors)—

AA batteries (SEK 50)—

Labour (20 min @ SEK 420)—

Total / year—

Battery life at -60 dBm~6.5 years

Swaps / year at -60~154

Cost / year at -60~SEK 30,900

Your current cost / year—

Extra cost / year—

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Elsys ERS Lite — RSSI & Battery Life