The Kenwood 1866S is a “Full DC Inverter AC” with features like:
- T3 compressor (for high‐ambient temperature performance) Energy Efficiency Ratio (EER) ≈ 4.0
- Claimed “Energy Efficiency up to 75% saving” compared to older or simpler units
What that means: this model is more efficient, by design, but actual savings depend on usage pattern, ambient temperature, how well the house is insulated, etc.
How Inverter vs Non-Inverter ACs Differ (in Energy Use)
To understand savings, it helps to compare how inverter ACs work vs non-inverter ones:
- Non-inverter ACs run their compressor at full power until the set temperature is reached, then shut off, then turn on again when temperature rises. These on/off cycles cause energy surges and waste.
- Inverter ACs modulate compressor speed—once the target temperature is reached, they run at a lower level (just enough) rather than turning off completely. This reduces waste and improves efficiency.
Reports & articles suggest that inverter ACs can save 30-50% in energy under many conditions, compared to non-inverter models.
Estimating Savings for the Kenwood 1866
Let’s run some example calculations to estimate savings. These are rough and depend heavily on actual usage conditions.
Assumptions
- Room size: standard medium room for 1.5 Ton AC (say ~20-25 m² or similar)
- Hours of operation: e.g. 8 hours per day in summer, for 120 days per year
- Non-inverter model EER (or efficiency) baseline: perhaps around 2.8-3.2 EER or older standard units that are less efficient
- Electricity cost: take a generic number, e.g. ₨30/kWh (you’d replace this with your local rate)
Non-Inverter AC Approximate Power Usage
A non-inverter 1.5 Ton AC might draw ~ 1.5 kW-2.0 kW when running depending on efficiency. But because of inefficiencies in start/stop cycling, the average power over time (including rest periods) ends up higher. Let’s assume:
- Running power during cooling: 1.8 kW
- Duty cycle (how much of the time it’s ‘on’): maybe 60% of the 8 hours = 4.8 hours of full usage (because it will cycle off, etc.)
- So daily energy use: 1.8 kW × 4.8 h = 8.64 kWh/day
Over 120 days: 8.64 × 120 = 1,036.8 kWh/year
Cost: 1,036.8 × ₨30 = ₨31,104/year
Kenwood 1866 (Inverter) Estimated Usage
Because of its high EER (≈ 4.0), more effective modulation, less waste, better response, etc., the inverter model might reduce required power significantly. Let’s assume 35-50% savings in real usage. So:
- If full power draw is lower due to efficiency: maybe average running power ~1.5 kW or less when needed
- Because of modulation, it might run at lower power for more time instead of full power bursts. Equivalent “full power hours” might be less. Suppose its “effective duty” is 45% instead of 60%.
Calculate:
- Average consumption: say 1.5 kW × (8 h × 45%) = 1.5 × 3.6 = 5.4 kWh/day
- Over 120 days: 5.4 × 120 = 648 kWh/year
Cost: 648 × ₨30 = ₨19,440/year
Estimated Savings
- Energy saved per year: ~ 1,036.8 − 648 = 388.8 kWh
- Cost saved per year: ~ ₨31,104 − ₨19,440 = ₨11,664
That’s about 37-40% saving, based on these assumptions.
What Affects the Real Savings
The above is estimate; actual results will vary depending on:
- Ambient / outdoor temperature
Because T3 compressor means good performance even in higher outdoor temps (common in Pakistan), but if ambient is very high, the AC works harder. - Set temperature
If you set a cooler temperature, compressor works longer / harder → lower savings. - Usage hours
More hours per day → more absolute savings; occasional usage lessens savings. - Insulation of room, leakage, shading etc.
A well-insulated room with minimal heat gain gives better savings. - Electricity tariff
Savings in cost depend on cost per kWh. If rates are high, money saved is more. - Maintenance
Clean filters, correct refrigerant charge, correct installation all matter. - Starting/stopping frequent cycling
Even inverter ACs have to respond to large temperature swings; frequent changes reduce marginal savings.
What the Kenwood 1866S Claims
Some specific features of the Kenwood 1866S that help with efficiency:
- EER 4.0 is quite high, meaning good efficiency under standard conditions.
- “Full 5DC Inverter + EEV (Electronic Expansion Valve)” – EEV helps optimize refrigerant flow for varying load, improving efficiency.
- “Energy Efficiency up to 75%” claimed by the manufacturer (“up to”) likely refers to savings compared to much older, non-inverter models.
Conclusion
If you are considering the Kenwood 1866S, you can expect:
- In many cases 30-50% lower electricity consumption compared to a typical non-inverter AC of similar capacity under similar conditions.
- For typical summer usage (e.g. 8 hours/day for ~120 days), that could translate to saving several hundred kilowatt-hours (~₨10,000-₨15,000 or more) per year (depending on local rates).
- Over the lifetime of the unit (say 10+ years), this compounds to quite substantial savings, possibly justifying the higher upfront cost.
If you want to save your electricity bills then Kenwood 1866 is the best choice for you. Come to Electrociti and get the best prices on it.
