§1What this business is
A rectifier converts AC to DC for electroplating, electrolytic work and charging storage batteries. The profile's model is a 12 V / 150 A air-cooled set: an E-and-I stamping core is pressed, the primary is wound with 132 turns of 10-gauge enamelled copper wire and the secondary with 10 turns, high-current diodes are mounted on an aluminium bus bar, and a variac, switch, indicator lamp, ammeter and voltmeter are fitted in a sheet-metal cabinet. Each set is tested before sale.
Capacity: 600 rectifier sets a year (12 V / 150 A), worth ₹91.80 L at ₹15,300 each.
§2Is it right for you?
Who it is for
An electrical technician or transformer winder with contacts in electroplating and battery trades.
Who it is not for
Someone with no transformer or power-electronics experience.
Advantages
- Every plating shop and battery-charging business needs DC supply
- Small fixed capital (₹2.85 L)
- Can be built in many ratings (6 V/10 A to 24 V/500 A)
- Repair and rewinding work after sale
Drawbacks
- No specific BIS standard, so buyers judge by brand and track record
- Copper, steel stampings and diodes are most of the cost
- Switch-mode (SMPS) rectifiers are replacing transformer sets
- Large working capital (₹19.54 L)
Skills you need
- Transformer design and winding
- Diode and bus-bar assembly
- Testing and calibration
- Selling to platers and battery shops
Why difficulty 3/5: Needs transformer design skill and steady industrial buyers.
§3Market
Who buys
- Electroplating shops
- Battery charging and battery repair shops
- Electrolytic process units
How it sells
- Direct sale to platers and battery shops
- Electrical and industrial dealers
Good to know
- The profile expects demand to rise with industrial activity and battery use.
- BIS has no specific standard for the rectifier; components follow IS 3700 (profile).
§4Raw material & machinery
| Item | Qty | Cost |
|---|---|---|
| Power press, 30 tonne | 1 | ₹80,000 |
| Guillotine shearing machine, 1200 mm | 1 | ₹20,000 |
| Drying oven, 6' × 6' × 6' | 1 | ₹20,000 |
| Drilling machine, 1" capacity | 1 | ₹15,000 |
| Air compressor with spray gun | 1 | ₹15,000 |
| Arc welding set 200 A, fly press No. 6, bench grinder, flexible shaft grinder, winding machine | 1 each | ₹30,000 |
| Test panel, HV tester 5 kV, megger 500 V | 1 each | ₹18,000 |
| Dies and fixtures | 1 lot | ₹25,000 |
From: DC-MSME project profile — Rectifier D.C. (2003)
- E and I core stampings (12 sq inch)₹1,10,000 a month
- Enamelled copper wire, 10 gauge600 kg a month at ₹180/kg = ₹1,08,000
- Diodes, 150 A / 100 V200 a month at ₹500 = ₹1,00,000
- Dimmerstats, 10 A single phase50 a month at ₹1,800 = ₹90,000
- MS angle and CRC steel sheet₹60,000 a month
- Ammeters and voltmeters50 each a month = ₹50,000
- Insulation, aluminium bus bar, switches, lamps, brass hardware, paint, name plates₹71,250 a month
From: DC-MSME project profile — Rectifier D.C. (2003)
Suppliers in Building Business Bazaar
Prem Engg. Works · Delhi →Manjeet Engineering Works · Delhi →Sivamani and Co · Coimbatore →Toshniwal Bros · Mumbai →
§5Licences & registration
- Udyam registration
- GST
- Trade licence from the local body
§6Schemes & subsidies
- PMEGPCentralActive15–35% subsidy
- MudraCentralActiveLoan up to ₹20 lakh, no collateral
- CGTMSECentralActiveNo collateral, up to ₹10 crore
- Stand-Up IndiaCentralClosed₹10 lakh – ₹1 crore loan
The ₹22.39 L project fits PMEGP, CGTMSE and Stand-Up India; MUDRA (up to ₹20 L) covers most of it.
§7Money
How the investment is worked out: DC-MSME profile: fixed capital ₹2.85 L (30-tonne power press ₹80,000, guillotine shear ₹20,000, drying oven ₹20,000, drilling machine ₹15,000, air compressor ₹15,000, dies and fixtures ₹25,000, office furniture ₹25,000, electrification ₹18,000, welding set, grinders, fly press, winding machine and testers); working capital for 3 months ₹19.54 L; total ₹22.39 L. Building rented.
Working capital: Working capital for 3 months ₹19.54 L; monthly spend ₹6.51 L, of which parts for 50 sets ₹5.89 L (core stampings ₹1.10 L, copper wire ₹1.08 L, diodes ₹1.00 L, dimmerstats ₹90,000).
Prices from 2002–03 — machinery, material and wage costs will be much higher now.
§8Export potential
Confirm the HS code in the DGFT ITC(HS) lookup before you export
Export council / board: EEPC India
- Confirm the 8-digit ITC(HS) line with DGFT or your customs broker before shipping.
- You need an Import Export Code (IEC) from DGFT before the first shipment.
§9Risks — where people fail
- Shift to SMPS rectifiers
- Copper price rise
- Overheating failures and warranty claims
- Slow-paying small buyers
§1030 / 60 / 90-day plan
A general plan that applies to any business. A plan for this business will be added after research.
- Days 1–30: Visit a working dc rectifiers for electroplating and battery charging unit, ask 10 buyers about price and quantity, and get quotations from 3 suppliers.
- Days 31–60: Udyam and the licences you need (Udyam registration, GST), a project report (DPR), and the scheme or loan file.
- Days 61–90: Space and machines, trial production, and first deliveries to 10 customers.
§11Who to connect with
Associations, clusters and training institutes — the directory is being built. Connect
§12Watch
There is no episode on this business yet. Shows are coming soon on the Podcast page.
Want to start DC Rectifiers for Electroplating and Battery Charging?
DPR, loan file or registration — ask us on WhatsApp.
¶Sources
Data review: 6 October 2026. Spotted a mistake? Report it. For information only — not legal or financial advice.