Residual bills while away usually mean hidden loads — not only the refrigerator. Daily totals in roughly the mid‑teens kWh strongly suggest pumps, inverter/idle draw, thermal loads, cooling equipment, mis-labeled metering, or the whole‑home monitor measuring more than “fridge-only.” Bring a licensed solar + electrical technician to correlate your monitoring app against CFE delivery, clamps/CT wiring, inverter settings, breakers left on, and pool/well equipment.
A refrigerator running 24/7 in the Riviera Maya climate typically pulls 1.5–3 kWh/day depending on age, door seals, and ambient room temperature. So when you see 11, 14, 17 kWh/day on a vacant home, something else is doing 8–14 kWh/day of work — and that something is almost never visible from the road.
The most common hidden loads we find on vacant Puerto Morelos homes, ranked by frequency:
1. Pool, hot tub, or palapa-area pumps that owners forgot are still on a timer. 2. Septic pumps, cistern pumps, or aerator pumps that cycle 24/7 on biofilter systems. 3. Inverter idle / standby draw (typically 30–80W = ~0.7–1.9 kWh/day even when "producing nothing"). 4. Phantom loads from modems, smart-home hubs, alarm panels, DVRs/cameras, mini-splits in "vacation" mode (which is rarely true standby). 5. CT (current transformer) clamp installed on the wrong leg of a split-phase service, double-counting one circuit. 6. CFE tariff reclassification — once you exceed a threshold over a rolling 12-month window, the meter shifts to the high-consumption "DAC" tariff and the peso/kWh rate roughly doubles. Bills feel high because they ARE high, not because consumption changed. 7. Net-metering reconciliation timing — your solar production isn't always credited monthly; some bills show net consumption while production credits sit in a 12-month rolling balance you haven't read.
A good technician does five things in this order: reads the last 12 CFE bills (looking for tariff category shifts), opens the inverter monitoring portal and compares daily production vs delivery, walks every breaker with a clamp meter to identify what's actually drawing, photographs the CT placement at the meter, and checks the inverter standby/idle draw with the panels covered.
Expat-heavy groups in Puerto Morelos often compare peso bills without the same tariff context; solar adds a second metering story (consumption vs production vs net billing). Neighborhoods such as Selva include mixed vintages — old fridges alone can creep usage, but they rarely explain teens of kWh per day sustained without other circuits.
Assuming the refrigerator is the sole load because it is the “only intentional” appliance — many silent draws stay hot year-round.
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