Accessories
Mounting structure, cable, connectors, breakers and charge controllers explained.
Solar accessories · Charge controllers
Solar Charge Controller Price in Karachi
A charge controller keeps panels from overcharging a battery. Pick the wrong size and it overheats or wastes panel power. These sums show how to pick the right one.
- ✓ MPPT or PWM
- ✓ Sizing by amps
- ✓ Free estimate on WhatsApp
What a charge controller does
A charge controller sits between the panels and the battery. It limits the current and voltage so the battery is charged correctly and not damaged. It also stops power flowing backward into the panels at night.
You need a separate controller only in a small standalone setup, where panels charge a battery bank directly. A hybrid inverter already has a controller inside it, so you do not buy one on top.
If you are building a small off-grid system for lights, fans, a pump or a shop, the controller is one of the parts that decides how well the whole thing works.
Charge controller prices we quote
Prices are per unit and change with the dollar rate and stock.
| Item | Detail | Price (PKR) |
|---|---|---|
| MPPT charge controller | 40 A and 60 A models | Contact us for latest prices |
| MPPT controller 80 A | For larger 48 V banks | Contact us for latest prices |
| PWM charge controller 30 A | For small 12 V setups | Contact us for latest prices |
Prices change with the exchange rate and stock. Contact us for the latest prices.
MPPT or PWM
The two types work differently and suit different jobs.
| Point | MPPT | PWM |
|---|---|---|
| How it works | Converts panel voltage down to battery voltage and tracks the best power point | Connects panel to battery and cuts current as the battery fills |
| Efficiency | Higher, since it uses the full panel power | Lower, since extra panel voltage is wasted |
| Panel voltage | Can be much higher than the battery | Must be close to the battery voltage |
| Cost | Higher | Lower |
| Best for | Larger arrays and 24 V or 48 V banks | Very small 12 V setups |
Makers claim MPPT controllers recover more energy than PWM ones, and the gain depends on the setup. Read the datasheet of the exact model.
How to size the amp rating
Use this method for a standalone setup. Add a margin so the controller is not working at its limit.
- 1
Add up the panel watts
For example, two 400 W panels make an 800 W array.
- 2
Divide by the battery voltage
800 W divided by 24 V is about 33 A of charge current.
- 3
Add a 25 percent margin
33 A times 1.25 is about 42 A, so choose the next size up, a 50 A controller.
- 4
Check the input voltage limit
The controller maximum PV voltage must be higher than the open-circuit voltage of the panels in series, with a margin.
- 5
Check the battery voltage
The controller must support your 12, 24 or 48 V bank.
Common mistakes
Most controller problems come from a few repeat errors.
- Too many panels in series. The voltage goes over the controller limit and can destroy it. Panel voltage rises a little in cold weather, a small effect in Karachi but still worth checking.
- Wrong battery setting. A controller set for lead-acid will not charge lithium properly, and the reverse.
- Long thin cable. A long run with thin cable loses power and heats up.
- No fuse or breaker. Protect the battery side and the panel side.
- A controller in a hot closed box. Controllers run warm. Give them air.
Hybrid inverters already include one
If you buy a hybrid inverter, it has its own charge controller, usually MPPT. Paying for a second one wastes money. See our hybrid inverter guide for the full list of features. For lead-acid banks, the tubular battery page shows how to build the bank.
FAQs
Questions people ask us
Short answers. For your own property, send us your electricity bill and roof details.
Ask on WhatsAppIt depends on the amp rating, the voltage and the brand. Send your array and battery details and we will quote the right size.
Usually not. Most hybrid inverters have a controller built in.
MPPT for most setups beyond a very small 12 V one. PWM only for tiny systems where cost matters most.
Divide the array watts by the battery voltage, add 25 percent, and pick the next size up.
Only if it has settings for both. Check the datasheet and set it correctly.
Related pages
Tubular Batteries
Tubular batteries: bank sizing, usable capacity and heat care.
Hybrid Inverters
How a hybrid inverter works, what drives the price and how to size one.
Breakers & SPD
DC breakers and surge protectors: ratings, standards and the mistakes to avoid.
Building a small off-grid setup?
Send your panel and battery details. We will size the controller and give you a free estimate.