Specification sheets in this industry are not standardised. Two manufacturers can describe the same machine in ways that share almost no common ground, and two genuinely different machines can look identical on paper. This is a guide to reading them, line by line, with the question to ask against each.

Rated Capacity (kg/day)

The headline number, and the least standardised.

Capacity can be stated as input mass per day, meaning how many kilograms of waste you can feed it. It can be stated as a function of chamber volume, meaning how much it physically holds. Or it can be stated at an assumed moisture content that may be nothing like Indian kitchen waste. A machine rated at 100 kg/day on dry, pre-drained waste may handle appreciably less of the wet, high-moisture waste your kitchen actually produces.

Ask: Is this input mass or chamber fill? At what moisture content? Per cycle or per 24 hours? Does it assume one cycle a day or two?

Until you have those answers from every supplier, your quotations are not comparable.

Chamber Volume (litres)

Two different numbers hide here. Gross volume is the geometric capacity of the vessel. Working volume is how much you can actually charge, which is always less, because the material needs headspace to tumble and aerate. A chamber filled to the brim cannot mix.

Ask: Gross or working? What is the maximum recommended fill level?

A useful cross-check is to divide the working volume by the rated capacity. Loose kitchen waste weighs roughly 0.3 to 0.5 kg per litre; wet Indian kitchen waste sits at the upper end, and shredded waste packs denser still. So a 100 kg charge needs well over 100 litres of working volume once you allow headroom for mixing. If the arithmetic doesn’t leave room to tumble, the rating is optimistic.

Motor Rating (HP or kW)

Machines have more than one motor. Typically a shredder motor, an agitator motor and a blower. A single combined figure tells you very little. What matters is whether each motor is rated for the torque its job actually demands, and the shredder in particular, because that is where the machine meets bone, coconut shell and the occasional spoon.

Ask: Separate ratings for each motor, make and model, and specifically what the shredder motor is rated at and what happens when it jams.

An underrated shredder motor is the commonest source of nuisance tripping, and the problem does not appear during a demonstration with soft vegetable waste.

Heater Rating (kW)

Usually the largest single contributor to your running cost.

The rating alone is only half the story. What decides your bill is control: whether the heater runs for the whole cycle, or is thermostatically controlled to hold a setpoint and cuts out once the biological process is generating its own heat. A thermostatically controlled 3 kW heater can consume far less over a cycle than a continuously-on 2 kW heater. This is the specification line where a small design difference produces a large recurring cost difference, and it is almost never discussed at the buying stage.

Ask: Is heating thermostatically controlled? What is the setpoint? What proportion of the cycle does the heater typically run for?

Connected Load vs Running Load

Connected load is the sum of everything that could draw power simultaneously. It sizes your cable, your isolator and your sanctioned connection. Running load is what the machine typically draws during a cycle, and it determines your electricity bill. Suppliers quote whichever figure suits the conversation.

Ask: Both figures in kW, plus the starting current for the largest motor. A high inrush on a site with a marginal connection causes problems that look like machine faults and are not.

Duty Cycle

Whether the machine is designed for continuous daily operation or intermittent use with rest periods. This matters if you intend to run more than one cycle a day, or if your peak season means the machine runs seven days a week for months. A machine specified for intermittent duty and operated continuously will show it in the gearbox and motor.

Ask: Continuous or intermittent duty? What is the maximum number of cycles per 24 hours? Is there a required cooldown between cycles?

Material of Construction

“SS body” is not a specification. Grade matters, and it matters differently for different components.

Ask for grade against each component: chamber, shaft, paddles or agitator, discharge door, outer cladding, frame. Then ask for mill test certificates for the plate used in your machine, not a brochure statement.

The chamber and everything touching the waste is the part that matters. It lives in a hot, wet, salty, acidic environment, which is precisely the service condition that separates stainless grades. In detail: SS 304 vs SS 202 vs MS epoxy.

IP Rating of the Electrical Panel

IP ratings describe protection against solids and liquids. The second digit is the one that matters here, because this machine gets washed down. IP55 is a reasonable minimum for a panel in a wet back-of-house. Lower ratings will admit moisture, and moisture in a panel produces intermittent faults that are difficult and expensive to diagnose.

Ask: IP rating of the panel enclosure, and where the panel is intended to be mounted relative to the wash-down zone.

Reduction Gearbox

The commonest major failure point on this class of machine, and often the least specified.

Ask: Make, model, ratio and service factor. Service factor is the margin between the gearbox’s rated capacity and the load it actually sees. A gearbox selected with no margin will run, pass its warranty period, and fail in year three or four.

A supplier who can quote the service factor has engineered the drive. A supplier who cannot has bought a gearbox that seemed about right.

Bearings and Seals

The second commonest failure point, and the one that determines how long a repair takes. The shaft passes through the chamber wall, which means seals working against a hot, wet, abrasive medium. Seal design and bearing protection here separate machines that need annual attention from machines that need it quarterly.

Ask: Bearing make and designation. Seal type and arrangement. Are these standard catalogue items available locally, or proprietary?

Noise Level (dB)

Relevant if the machine sits anywhere near guest rooms, offices or residences. The shredder is the noisy component.

Ask: Measured at what distance, and under what load? A figure measured at three metres on an empty machine tells you nothing useful.

Cycle Time

Ask: Total, or excluding loading and discharge? If you need two cycles a day, a 20-hour cycle that is really 20 hours plus an hour of loading and an hour of discharge does not fit into 24 hours twice.

How to Normalise Two Quotations

Build a single comparison sheet with these rows and fill it from written answers, not brochures. Any blank cell is a question you have not yet had answered. Blanks concentrated with one supplier are themselves the finding.

Frequently Asked Questions

What does MOC mean on a specification sheet?

Material of construction, meaning the metal grade used for each component. Ask for it component by component, not as a single claim.

Why do two 100 kg machines have different motor ratings?

Because capacity ratings are not standardised, and because designs differ in how much work the shredder does versus the agitator. Compare the underlying components, not the headline capacity.

What IP rating should the panel have?

IP55 is a sensible minimum in a wash-down environment, higher if the panel sits in the wet zone itself.

What is a service factor on a gearbox?

The margin between the gearbox’s rated capacity and the actual load. It is the specification that most reliably predicts whether the drive will survive to year five.

Next Steps

For the body material decision in depth, see SS 304 vs SS 202 vs MS epoxy. To take these questions into a supplier meeting, use the 15 questions. The full picture is in the complete buyer’s guide.