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Practical guide for South African makers: calculate voltage, current, power, wiring and protection when choosing a power supply for robotics projects. Local stock and pickup tips.
Calculate continuous current, then allow headroom for motor stalls and inrush.
Use dedicated rails or DC-DC converters for logic and sensors to avoid noise.
Check Communica stock, branch pickup and VAT invoice options to avoid delays.
Choosing a power supply for robotics projects affects performance, safety, and uptime. This guide explains how to size voltage and current, understand battery vs bench supplies, handle inrush and peak loads, and select connectors and protection suited to hobbyist, student and industrial prototype use in South Africa. Wherever useful, examples use ZAR estimates and local considerations like lead times and branch collection.
Robotics components (motors, controllers, sensors) require specific nominal voltages. Choose a supply whose nominal voltage matches the highest-voltage device in your system, and allow headroom for regulated electronics. For microcontrollers and sensors, use a regulated 5V or 3.3V rail; for motors, use the motor-rated voltage. If you need multiple rails, either use a multi-output supply or local DC-DC converters.
Motors and actuators draw large peak currents during start-up or stall. Size the supply for continuous current plus a safety margin for peaks. As a rule of thumb, allow 1.5x to 3x the steady running current for peak capacity depending on motor type. For example, a motor that runs at 2 A continuously but draws 6 A at stall should be supported by a supply capable of short-term peaks near that stall current and continuous current above 2 A.
Use these basic formulas to estimate requirements:
Voltage (V) × Current (A) = Power (W)
Example: a 12 V motor at 2 A consumes 24 W. For a system with a 12 V motor (2 A) and 5 V logic (0.5 A): total power = (12 × 2) + (5 × 0.5) = 24 + 2.5 = 26.5 W.
Bench power supplies are great for testing and classrooms because of adjustable voltage/current limits. Batteries (LiPo, SLA, Li-ion) provide mobility for field robots. Fixed wall-mount or DIN-rail DC supplies are best for long-running test rigs and lab benches where stability and efficiency matter.
Higher efficiency reduces heat and extends battery runtime. Check the power rating (W) and thermal management needs; supplies with conservative derating at higher ambient temperatures are helpful in warm South African summers. For continuous loads, choose a supply rated above your calculated continuous power by ~20% to avoid running at maximum capacity.
Local note: Communica stocks a wide range of power supplies and batteries popular with makers and students. Check stock and branch pickup options to avoid lead time delays: All Products and view branch hours at Branches & Trading Hours.
Use connectors rated above your expected current. Common choices: screw terminal blocks for bench supplies, XT60 or Anderson Powerpole for batteries, and Molex/Micro JST for low-current electronics. Ensure wire gauge matches current - see the table below for quick guidance.
| Approx Current (A) | Suggested Wire Gauge (AWG) | South African equivalent |
|---|---|---|
| 0-3 A | 22-18 AWG | 0.5-1.0 mm² |
| 3-10 A | 16-12 AWG | 1.0-2.5 mm² |
| 10-30 A | 10-8 AWG | 4.0-10 mm² |
Include fuses or circuit breakers sized to protect wiring and devices. Current-limited bench supplies are useful during debugging. For large motor inrush, soft-start circuits or series NTCs reduce mechanical stress and prevent supply tripping.
Switching supplies are efficient but can introduce switching noise. Sensitive sensors and ADCs may need additional filtering, low-noise linear regulators, or separate supply rails to avoid measurement errors.
Explore Communica's product categories for power modules and batteries at Collections, learn about the company's history and capability at About Us, or browse specific brands at Shop by Brand.
Components: four 12 V DC motors (each 1.5 A running, 6 A stall), microcontroller and sensors at 5 V drawing 0.5 A total, motor drivers with 0.5 A overhead. Calculate continuous current: motors = 4 × 1.5 A = 6 A; add drivers and logic = 6 A + 0.5 A + 0.5 A = 7 A. Allow 2x headroom for peaks = design for 14 A at 12 V. Power = 12 V × 14 A = 168 W. Choose either a battery or DC supply meeting these specs with good peak capability and fusing on motor lines.
12V Battery/PSU -----+-----+--- Motor Driver IN
| |
| +--- Motor Driver IN
|
+--- Buck Converter ---- 5V Regulator ---- Microcontroller + Sensors
Include fuses on the positive lines to each motor driver and a main fuse on the battery/PSU.
For South African builders, availability and lead time can be decisive. Check local stock levels and branch pickup to avoid project delays. Communica's central Samrand warehouse plus branches in Pretoria and Cape Town can lower wait times; confirm cut-off times and VAT invoice options for education and procurement needs when ordering. Use the where to buy reliable power supplies in south africa page to plan collections.
When ordering a power supply, include fuses, appropriate connectors (e.g., XT60, Anderson Powerpole), wire of correct gauge, and decoupling capacitors. Consider a bench supply for development and a battery pack for field testing. Browse suitable accessories in the power and cabling sections of the best 12v power supplies for hobby electronics.
To choose the right power supply for robotics projects, calculate voltage and continuous/peak current, allow safety margins, select compatible connectors and protection, and plan for local availability. For classroom and prototyping needs, a bench supply plus a battery is often the most flexible approach. For permanent rigs, pick a robust DC supply with adequate derating and thermal handling.
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Very friendly and helpful; and a wide selection of items (at their location). You can also purchase via their WebSite; I have never been disappointed...
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Online support and communication is next level - great communication, fast response - very helpfull, recomended supplier - online payment was no hasse...
He's polite, good with people and made me feel free to talk.. all in all he's helpful
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Best service received from Rocket! What a pleasure dealing with him. Thank you Rocket
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Sydney and Nicole were absolutely fantastic and helped me with my purchases. Thank you.
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Needed to buy a bluetooth GPS receiver. The staff was friendly, knowledgeable and assisted without any issues. This is a toys tore of note for peopl...
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They have mostly any electronic tool and components that you may require - Thanks to Nicole for helping me.
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One of the cashier services rendered to me was here at communica by the lady named Nicole and her manager dolly they were both willing to go above and...
The service was excellent, Nicole and Rehaan were very helpful and professional in their work.
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Great service, Rehaan and Layla were spectacular with assistance. 10/10 Would definitely recommend.
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Mohamed Sharief is a great asset to Communica. He provides a 5 star service and good product knowledge. Keep up the good work.
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Quick quality customer service.
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Verified customerNicolene
Verified customerGreat place to purchase electronic components at a fair price. They have a wide range of products and a well functioning ticketing system that ensures...
After being supplied the incorrect track for my garage motor, despite me asking twice if it was the correct track, I had to return to the store to exc...
They have most every electronics component you might need. Staff are knowledgeable and friendly. I was looking for a bespoke miniature item for a lapt...
Great service as always from Nicole and Sydney especially Mpho at the sales desk
Verified customerGood Array of products and sound advice
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I visit Communica once in a blue moon. Always wish i have more time to look at everything. Good & friendly service. Nothing wrong with a queuing syste...
Currently have only purchased items from their on-line store. Received what I ordered plus quick delivery. No complaints to date.
Verified customerThe new ticketing system is great, but the queues are still exceedingly long, and there are hardly any staff on hand in the shop to assist with questi...
I needed a heat-sensitive diode as one of my Philips appliances had had a failure. Philips wants you to throw the entire thing away, but I tried look...
I got the most pleasant service from Sydney and Windie
Verified customerExcellent range of items, with technical staff that know their stuff. Unfortunate location that makes it a bit difficult to get to, but worth the tre...
Wide range of electronic components. Very likely to find what you are looking for. Arthur was very helpful. Don't bother trying to call for informatio...
Great place. Reasonable prices. Keeps component level items as well as security, surveillance and electrical items and tools
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Great pricing and a wide variety of products to choose from. A must visit if you've ever been to the Pretoria branch.
Verified customerNicole was very helpfull and friendly.
Verified customerGood job Nicole! Well done!
Verified customerSlowest service ever! Even worst cashiers. I shudder to go. Good products though.
Verified customerGood service, would recommend.
Verified customerWide range of electronics for the diy enthusiastic, ranging from solar systems to alarms and cctv.
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Verified customerService has improved but still a long way to go to actually sort it out.
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Verified customerThe is a computerised quing system and you can pick n pay....but the problem is the is no lift and the only way to get up is using steps
Verified customerFor Sonoff ewelink WiFi switch.
Verified customerThank you for your patience ma'am Mpho
Verified customerGood verity of products. Helpful staff albeit a bit slow
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Verified customerSomethings are getting pricey, but still a good place to pick up components
Verified customerNicole and Sydney were very helpful
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Verified customerA good electrical/electronic sales store packed with almost every component you require
Verified customerIf you love engineering you'll love this shop apart from the terrible queues and long waiting times
Verified customerAlmost all electronic spares available at reasonable prices.
Verified customerVery fast and friendly service, avoid it in friday afternoon if possible.
Verified customerExcellent, ask for Sydney. Solved immediately
Verified customerThey have everything you would need. Service is good
Verified customerBig electronic component shop. Counter can be very busy. Lots of parking.
Verified customerClose to closing time so i was in and out quickly
Verified customerAll the goodies in one place and Mohamed is always willing to help
Verified customerWide variety of electronic goods. Staff helpful with good advise.
Verified customerGood verity, lots of stock, mostly helpful staff
Verified customerVery helpfull. Thank you
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Verified customerExcellent service Nicole
Verified customerLarge selection, low on staff during lunch time when they are busy.
Verified customerGreat for your electronic needs - Prices are a bit expensive
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Verified customerDefinitely will have what you're looking for.
Verified customerCheap electronics and great educational goodies for the kids
Verified customergood selection of electronic supplies accessible
Verified customerGreat variety of stock on hand
Verified customerGood variety of electronic components available
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Verified customerLarge number of electronic components
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Verified customerRather a slow process
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Verified customerWaiting time can be annoing.
Verified customerCommunica supplies semiconductors and electronic components to industries such as automotive, electrical, automation, mining, and education.
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