Solar for Auto Parts Manufacturers

This guide is for parts makers and vendors in Lahore, Gujranwala, Sheikhupura and the rest of Punjab. Our guide to solar for factories in Lahore's industrial estates covers estate supply arrangements and LESCO points; our Gujranwala and Sheikhupura pages cover those districts.

A vendor industry with tight margins

Pakistan's automotive parts industry is largely a vendor industry supplying vehicle assemblers. The Pakistan Association of Automotive Parts and Accessories Manufacturers (PAAPAM), headquartered in Lahore, puts the number of vendors at about 1,600, around 400 of them Tier I suppliers to assemblers, making stamping parts, die-cast and machined parts, rubber, plastics, electronics, seats and more. Margins are set by OEM price negotiations, so energy cost goes straight to the bottom line.

Diagram

Auto parts manufacturing

Presses

Heavy motor load

Compressors

Run through the shift

Where the power goes in a parts plant

Machining sections have their own design points, such as drive sensitivity and spindle start-ups. Our guide to solar for CNC and engineering workshops goes into those.

Start with measurement, not estimates. Log kW, kVAR and power factor for at least a week of normal production; our energy audit before solar lists what to record.

Presses and welders: peaks, not energy

Presses and welders use less energy than their nameplates suggest, because they draw power in short bursts. Their effect on the bill comes from peaks, not units.

• Maximum demand. When several presses strike, welders fire and a compressor starts in the same few minutes, demand spikes. If that spike falls in a recording period, it sets your MDI. A cloud or an early-morning start can push it straight onto the grid, so solar does not reliably reduce MDI. Staggering start-ups, soft starters on large motors, and in some plants battery peak shaving are the tools. See what MDI means on your bill.
• Phase unbalance. Many welders are connected across two phases. A three-phase inverter supplies balanced power, so the grid carries the unbalance. Spread welding sets across phases where possible. See phase imbalance with solar.
• Supply quality. Welders and drives add distortion and voltage dips, which can trip inverters or upset CNC controls. See harmonics and power quality.

Power factor: check it before and after solar

Parts plants are full of motors, so most already have a capacitor bank (APFC panel) to keep power factor above the penalty threshold. Rules shown are from LESCO; FESCO, GEPCO and MEPCO apply NEPRA's tariff terms, so check your own bill. Solar changes the picture. The inverter supplies active power (kW) but normally little or no reactive power, so the meter sees fewer kWh with the same kVARh, and measured power factor falls. In a press shop with a lot of reactive load, that can tip a plant into penalties it never paid before.

The fix is part of the design: review CT position and controller settings on the APFC panel, add or resize capacitor steps (detuned where drives are heavy), and use the inverter's reactive power settings where the DISCO allows. Our guide to power factor and solar explains each step.

Sizing for a parts plant

New solar connections come under NEPRA's net billing rules, notified on 9 February 2026. Imports are billed at your tariff and exports are credited at a much lower rate, reported at about Rs 10-11 per unit when the rules were notified. Capacity cannot exceed your sanctioned load, with an overall cap of 1 MW. See our net metering and net billing guide.

The arithmetic below uses round illustrative numbers only.

For example, if a vendor plant uses 60,000 units a month over 26 working days, about 2,300 units a day, and around 70% of that falls in daylight on a long day shift, daytime use is about 1,600 units. At a rough yearly average of about 4 units per kW per day for a good Punjab site (units per kW), about 400 kW would match the average daytime load. Roof space, sanctioned load and the 1 MW cap may set a lower limit first.

Two things matter for parts makers in particular:

• Order cycles. OEM schedules change with car sales. In slow months, a plant sized for peak production exports more at the low rate. Size for your normal year, not your best month. Our guide to sizing under net billing covers this.
• Growth. New tooling or a second shift changes the load. Leave room on the roof, in the inverter room and in the electrical design to add capacity later; see planning a phased solar rollout.

Backup and generators

A press or line stopping mid-cycle can scrap parts and miss a delivery. Most plants keep a generator. Solar can share daytime load with it through a proper controller that stops reverse power and keeps the generator above its minimum load; see solar and generator hybrid. We do not sell generators, but we integrate existing sets. Battery storage can carry critical loads, such as CNC controls, QC labs and IT, through short outages, and in some plants can shave demand peaks; see BESS for factories.

Roofs and plant layout

Parts plants are often in steel sheds with sheet roofs. Check the purlins and sheets for panel load; see solar on tin sheet roofs. Keep inverters away from paint booths, plating fumes and grinding dust, in a ventilated room. Our structures are designed in-house, fabricated and assembled by our own team, and carry a 3-year Solar Works Pakistan structure warranty.

Auto parts plant solar price

How Solar Works Pakistan helps

Solar Works Pakistan is a solar EPC, engineering and trading company founded in 2021, headquartered in Faisalabad with a branch in Lahore. We have served 300+ customers, including 50+ industrial clients, with specialist work in industrial EPC, hybrid systems and BESS. Our in-house engineers measure load, power factor and phase balance before design, and our own teams install and commission. For commercial inverters and storage we work with brands including Huawei and Sungrow, alongside other approved brands; the exact model is chosen per project and listed in the BOQ. Major equipment carries the manufacturer's warranty per product. Larger projects follow a project-specific schedule. See our industrial and commercial solar page.

Get today's price or a free site survey

Send 12 months of bills, your shift pattern, a list of presses, welders and compressors, and any power factor penalties on recent bills.

• WhatsApp or call: 0336 666 4321
• Email: info@solarworks.pk
• Head office: Main Boulevard, Sargodha Rd, Block F FDA City, Faisalabad
• Lahore branch: 2nd Floor, Jeff Heights, Gulberg, Lahore
• Hours: 9:00 AM to 6:00 PM, daily

We serve factories throughout Punjab, including Lahore, Gujranwala and Sheikhupura, and site surveys are normally free. You can also contact us online.

Frequently asked questions

Can solar run a press shop?

Solar can supply much of the press shop's running energy in daylight, while the grid or generator supplies the short heavy peaks. Expecting solar alone to carry press strikes is not realistic.

Why did my power factor penalty start after installing solar?

Solar supplies active power but usually not reactive power, so the meter sees fewer kWh against the same kVARh, and measured power factor drops. Adjusting the capacitor bank and inverter settings fixes it.

Can welding machines run on solar?

On a grid-connected plant, yes: solar supplies energy and the grid absorbs the pulses. In backup mode, welders need an inverter or battery sized for their peaks, and phase unbalance must be managed.

Will solar reduce my MDI charges?

Not reliably. Peaks from presses, welders and compressors often happen when solar dips or before it starts. Staggered start-ups, soft starters and battery peak shaving are the tools.

What size solar plant does a vendor plant need?

It depends on daytime units, shifts, roof area and sanctioned load. We size from 12 months of bills and a week of measured load, aiming for most output to be used on site.

Can we add more solar later as orders grow?

Yes, if the first phase is designed for it, with roof space, inverter room capacity and cable routes planned in advance.

Sources

1. PAAPAM, FAQ (number of vendors and product categories)
2. Net billing facts are carried over from our net metering and net billing guide, which lists its own sources.