1. Match the machine footprint to the space you actually have
The PWD01 is listed at L2500 mm × W900 mm × H1050 mm, and the specification table calls the movement mode autonomous driving with the note “automatic movement”. That footprint matters more than any performance figure, because these machines are sold for indoor garages and the narrow spaces of outdoor car parks — exactly the places where a walk-behind unit has to be carried, and where a trailer unit simply cannot go.
Do a tape layout before you enquire.
- Tape a 2.5 m × 0.9 m rectangle on the floor of the tightest bay, and walk the route the operator will take, including the reversing manoeuvre.
- Measure the entry: ramp gradient, doorway clear width, and any speed bump between the parking area and the bay. A unit that cannot reach the bay has zero productive hours, so its cost per cleaned vehicle is infinite.
- Check the turning space at the working end, not just the aisle. Narrow parking lots fail on the turn, not on the straight run.
Where a smaller footprint is required, compare the PWD01 against the PowerDe PWD02 steam cleaner in the same Cleaning Equipment Series, and if a powered unit is not needed at all, look at the hand-pushed models on the category page. Requesting customisation of the mobile platform and module combination is also an option on the custom-solutions page.
2. Fix the utilities before they become downtime
Every utility mismatch turns into lost working hours, which is the largest hidden line in an operating-cost estimate. From the published specification:
- Water inlet: tap-water inlet with a 4-point internal-tooth joint. Confirm you have a tap inside the bay area and a compatible fitting; a missing adapter is a lost day on commissioning.
- Clean-water tank: 80 L. Put that figure next to your real cycle. If your process consumes tank X litres per vehicle, the tank size tells you how many refills per shift the operator performs — that is operator time you must pay for.
- Working voltage: 48 V mobile battery, listed on the “without battery” model as “customer provided batteries”. Decide which variant you need.
- Sewage: a vacuum cleaner with a flat nozzle feeds a sewage tank. Decide where that tank is emptied and how, because drainage routing is a site cost, not a machine cost.
The battery question is the one to settle early. The supplier sells the PWD01 both with and without the battery pack. Buying without it is only cheaper if you already hold a 48 V pack in inventory, know its capacity, and can match it to the duty cycle of a full shift. If you do not, ask the factory to specify the pack for your shift length; the runtime figure is not published on the page and should be confirmed in the enquiry.
3. Energy cost: a worked method you can repeat
The PWD01 carries a 4.5 kW heater with PTC semiconductor heating. That number gives you a worst-case ceiling on electricity, and the method is arithmetic rather than a promise:
- Take 4.5 kW as the heater ceiling.
- Multiply by the number of hours the heater is actually energised per shift — measured on your own site with a clamp meter or a plug-in energy logger, not assumed at 100%.
- Multiply that energy figure by your own tariff. If you are on a time-of-use tariff, split the shift into peak and off-peak blocks and price them separately.
- Divide by the vehicles cleaned in the shift to get kWh cost per unit cleaned.
Do not stop at the heater. Steam generation is the load that dominates a machine of this class, so measure it with your real duty pattern: how many minutes of continuous steam per vehicle, and how long the unit idles between jobs. Add the vacuum and any pumping load separately. Then compare that measured energy cost per vehicle against what the same job costs you today with your current method — including chemicals, hot water, and the water you are charged for and charged to drain.
One caution for procurement files: do not carry an “up to 90% less water” type claim into a business case. High-temperature, high-pressure steam and hot-water work is used here to lift grease and grime with less detergent and less rinse volume, but the real saving is the one you measure on your own meter. PowerDe’s own product pages state the parameters — modes, heating power, tank volume — and leave consumption to the operating pattern.
4. Count the labour time you are actually buying back
For most buyers of a driving-style unit, labour is the line that decides the case. The PWD01 is a machine that carries itself: it supplies its own propulsion, and the overview describes a device that can be stopped and driven at any time. That removes the walking, pushing, and repositioning time that a hand-pushed machine adds to every bay. It also means one operator works the route instead of fighting the equipment.
Build the labour side the same way you built the energy side, from your own numbers:
- Time one vehicle end-to-end with the current method, including setup, moving, refilling, and drainage.
- Time the same vehicle on a demonstration PWD01, using the three published modes — hot water, dry steam, wet steam — and record which mode you used and why.
- Price the difference at your loaded labour cost (wage plus on-costs), not the headline wage.
- Scale it by vehicles per week and by the number of shifts the machine will run.
Ask the same question for quality rework. If a job has to be redone because grease was not removed, that second visit is a cost the comparison must capture. The three modes exist for a reason: hot water to flush loose soil, wet steam to work heavier deposits, dry steam where you need heat with minimal added water. Get the supplier to demonstrate each mode on the dirt you actually have — brake dust on wheels, oil on an engine bay, road film on a panel.
5. Downtime, safety systems, and consumables
The PWD01 page lists leakage protection, short-circuit protection, high-temperature protection, high-voltage protection, water-shortage protection and high-voltage explosion-proof design. Treat these as part of the cost model, not as marketing. Protection that trips safely protects the heater and the electronics; a heater replaced out of warranty is a capital event, and a machine that fails in the middle of a busy weekend is a shift you cannot recover.
Two items to price into the file before you sign:
- Spares and response. Ask which consumables wear — nozzles, seals, hoses, heater elements — at what price, and what the lead time is from Shenzhen to your site.
- Water quality. The inlet is tap water. If your site water is hard, scale management becomes a recurring cost and an availability risk; ask the factory what water treatment they recommend for your installation.
6. What to ask PowerDe before you request a quotation
Send the same short list to every supplier you are comparing, so the answers line up side by side. For the PWD01, the open questions that a facility evaluating operating cost needs in writing are:
- Battery capacity, runtime per charge, and charger output for the “including battery” variant.
- Steam temperature and steam pressure for the PWD01 — published for the fixed HW02 model, not for the PWD01 page.
- Water and energy consumption per hour in each of the three modes, measured on a reference duty cycle.
- Hose and wand lengths, and the full accessory list.
- Machine weight, so you can confirm the floor and ramp loading of an indoor garage.
- Warranty terms, spare-part pricing, and local or remote support arrangements.
- Whether your duty pattern calls for the PWD01, the PWD02, a hand-pushed HMW3, or a fixed HW02 installed at a wash point.
If your bay or your process is unusual, that last question may not have a catalogue answer. PowerDe lists customisation of cleaning equipment series hardware — module combinations, mobile platform and vehicle structure — as an engineering service, so a bay that does not suit any standard chassis is a discussion worth having before you force a standard machine into it.
A practical sequence for the evaluation
Run the trial as an engineering test with one owner, one sheet, and fixed conditions. Record the current baseline first, then the trial, using the same vehicle types and the same soil levels. Capture the numbers that will be used in the decision: energy meter reading, litres of water, operator minutes, rework visits, and the count of refills and drainage stops per shift. Where a figure is not on the product page — battery runtime, steam pressure, consumption per hour — get it in writing in the enquiry rather than estimating it yourself.
Then compare the two data sets line by line and let the payback fall out of them. A machine that fits the bay, runs a full shift on one battery charge, and cuts operator minutes per vehicle will pay for itself without anyone needing to believe a marketing number. Send PowerDe your site dimensions, your shift pattern, and your baseline timings, and ask for the model variant and configuration that fits those inputs.
