Electricity is one of the few genuinely predictable recurring costs in a cashew cutting operation. Unlike RCN price swings or labor availability, a motor’s power draw is fixed and its running hours are largely under your control, which means the electricity cost of cutting can be estimated with reasonable accuracy before you ever place an order. This is especially useful when comparing machines, since two cutting lines with similar throughput can carry very different running costs depending on motor size.
The Three Numbers That Drive the Calculation
Every electricity cost estimate comes down to three inputs:
- Motor power, in kilowatts (kW) — the rated draw of the machine’s motor, found on the nameplate or spec sheet.
- Operating hours — how many hours per day, and days per month, the machine actually runs.
- Electricity tariff — your local cost per kilowatt-hour (kWh), which varies widely by country, utility, and connection type.
Multiply the first two to get energy consumed, then multiply by the tariff to get cost. The formula is simple; the value of doing it carefully is in using real motor and tariff figures rather than rounded guesses.
Why Motor Power Doesn’t Track Head Count
A common assumption is that a bigger, higher-head-count cutting machine must draw proportionally more power. That is not how OUTTURN’s cutting line is engineered. Throughput scales mainly by adding parallel cutting stations (cups and blade positions) that one motor drives, so motor size rises in a couple of modest steps rather than in step with capacity:
| Model | Rated capacity | Motor |
|---|---|---|
| 2-head | 40–55 kg/hr | 1 HP (0.75 kW) |
| 4-head | 80–100 kg/hr | 1 HP (0.75 kW) |
| 6-head | 120–150 kg/hr | 1 HP (0.75 kW) |
| 8-head | 160–195 kg/hr | 1 HP (0.75 kW) |
| 10-head | 200–240 kg/hr | 1.5 HP (1.1 kW) |
| 12-head | 240–280 kg/hr | 2 HP (1.5 kW) |
Between the smallest and largest machine in the range, rated capacity rises around five and a half times while motor size only doubles.
The practical effect is a low kWh per 100 kg of raw cashew nut processed, and it improves as you move up the range even where the motor does step up. Using the midpoint of each capacity range:
- 2-head: ~1.58 kWh per 100 kg
- 4-head: ~0.83 kWh per 100 kg
- 6-head: ~0.56 kWh per 100 kg
- 8-head: ~0.42 kWh per 100 kg
- 10-head: ~0.50 kWh per 100 kg
- 12-head: ~0.58 kWh per 100 kg
The 8-head is the efficiency sweet spot, since it is the largest machine still running on the 1 HP motor. The 10- and 12-head models give up a little on energy per kilogram in exchange for substantially more output from one frame and one operator team.
A processor comparing machines purely on rated capacity can miss this: two machines with similar throughput but different motor sizes will have meaningfully different running costs over a season, even though the sticker capacity looks similar. When you’re evaluating cutting equipment, ask for the motor’s kW rating alongside its capacity range — capacity without power draw is only half the cost picture.
A Worked Example
Here’s how the calculation runs in practice, using a placeholder tariff of $X per kWh — substitute your own local utility or generator fuel-equivalent rate.
Step 1 — Daily energy use. Take an 8-head machine, which runs a 0.75 kW (1 HP) motor. Over an 8-hour day it consumes:
0.75 kW × 8 hours = 6 kWh per day
Step 2 — Daily cost. At a tariff of $X per kWh:
6 kWh × $X = $6X per day
Step 3 — Monthly cost. Assuming 26 operating days a month:
6 kWh × 26 days = 156 kWh per month 156 kWh × $X = $156X per month
Step 4 — Cost per 100 kg processed. An 8-head machine is rated at 160–195 kg/hr, so an 8-hour shift at the midpoint of that range processes roughly 1,420 kg of raw nut (actual output varies with operator pace — check the rated capacity range for your specific model). That gives:
6 kWh ÷ 14.2 = ~0.42 kWh per 100 kg $6X ÷ 14.2 = ~$0.42X per 100 kg
Once you know your local tariff, plug it in for X and the whole chain resolves to real currency figures. The same four steps work for any model or shift length — just substitute the right kW rating for your machine (1 HP up to the 8-head, 1.5 HP for the 10-head, 2 HP for the 12-head), your hours, and your tariff.
Grid, Generator, or Solar-Supplemented Power
The tariff variable in the calculation above depends heavily on how a site is powered, and many cashew processing sites use more than one source.
- Grid power is usually the cheapest per kWh where it’s stable, but tariffs vary enormously by country and can include demand charges or time-of-use pricing that complicate a simple per-kWh estimate.
- Diesel or petrol generators almost always cost several times more per kWh than grid power once fuel, maintenance, and generator wear are factored in, making them a costly primary power source for continuous cutting operations, even though they’re a practical backup for outages.
- Solar-supplemented systems can meaningfully reduce the effective per-kWh cost of running cutting machines over the system’s lifetime, particularly for a steady, predictable load like a cutting line. Because OUTTURN’s cutting range spans only 0.75 kW to 1.5 kW across every head count, and each machine draws that steadily through the shift, it’s a comparatively easy load to size solar and battery capacity around.
For a detailed walkthrough of sizing a solar or hybrid system for a cashew factory, including how to build a full site load table and think through battery storage and payback timing, see our guide on solar power systems for cashew processing factories.
Putting the Estimate to Work
Once you have a real tariff figure for your site, the same four-step calculation lets you compare running costs across shift lengths, machine counts, or head-count models before committing to a purchase. Because OUTTURN’s motor power only takes two modest steps across the range — 0.75 kW up to the 8-head, 1.1 kW on the 10-head, 1.5 kW on the 12-head — scaling this estimate from a single 2-head machine to a multi-line 12-head installation is mostly a matter of multiplying by the number of machines running, not re-deriving the whole calculation from scratch.