How Many Batteries for a 5kW Solar System in Pakistan
For a 5kW solar system in Pakistan, most homes need 2 to 4 tubular batteries (200-250Ah each) or a single 5kWh lithium battery, depending on how many hours of backup you want at night. The exact number depends on your load, your battery type, and whether you want backup for just a few hours or the whole night. This guide walks through the actual math so you don’t overbuy or underbuy your battery bank.
In This Guide
- Quick Answer
- How the Math Actually Works
- Tubular Battery Bank for 5kW
- Lithium Battery for 5kW
- Battery Bank Cost for 5kW System
- What You Can Actually Run
- Frequently Asked Questions
Quick Answer
| Backup Needed | Tubular Batteries | Lithium Batteries |
|---|---|---|
| 4-6 hours (lights, fans, router) | 2 x 200Ah | 1 x 2.5kWh |
| 8-10 hours (add fridge) | 3 x 200Ah | 1 x 5kWh |
| Full night (add 1 AC part-time) | 4 x 250Ah | 1 x 5kWh + 1 x 2.5kWh, or 1 x 10kWh |
How the Math Actually Works
Start with your load, not your panel size. List every appliance you want to run at night: lights, fans, router, fridge, maybe a TV. Add up the watts. A typical setup of 5 LED lights (50W), 3 fans (225W), a router (10W), and a fridge (150W running, cycling on and off) pulls around 500-700W continuously. Multiply that by the hours of backup you want. For 8 hours at 600W, you need 4,800 watt-hours, or 4.8kWh, of usable battery capacity.
This is where battery type changes everything. A tubular battery only gives you about 50% of its rated capacity safely. A lithium battery gives you 90-95%. So to get 4.8kWh of usable power, you need roughly 9.6kWh of rated tubular capacity, but only about 5.3kWh of rated lithium capacity. This is explained in more depth in our Lithium vs Lead Acid Battery guide.
Tubular Battery Bank for 5kW
A single 200Ah tubular battery at 12V stores 2.4kWh, but only about 1.2kWh is safely usable. For a 5kW solar system feeding a typical home, most installers set up a 24V or 48V battery bank (batteries wired in series) to match the inverter. A common setup is four 200Ah batteries wired to make a 48V bank, giving you roughly 9.6kWh rated, or about 4.8kWh usable, which covers 6-8 hours of moderate backup.
If your budget is tighter, two batteries (24V setup) covers basic lights and fans for 4-6 hours, which is enough for most short load-shedding cycles. For full pricing across brands, see our Tubular Battery Price in Pakistan guide.
Lithium Battery for 5kW
Lithium simplifies this a lot because one unit does the job of several tubular batteries. A single 5.12kWh (48V or 51.2V) lithium battery gives you about 4.6-4.9kWh usable, which is roughly the same backup as four tubular batteries, but in one box that weighs 45-55kg instead of four batteries weighing 150-200kg combined. For homes wanting longer backup, two 5.12kWh lithium units stacked together cover a full night, even with a fridge and part-time AC use. See our Lithium Battery Price in Pakistan guide for exact model prices.
Battery Bank Cost for a 5kW System
| Setup | Usable Backup | Approx. Cost |
|---|---|---|
| 2 x Phoenix TX 1800 (150Ah, tubular) | ~1.8kWh (4-6 hrs) | Rs. 44,000 – 50,000 |
| 4 x AGS EC 2200 (180Ah, tall tubular) | ~4.3kWh (7-9 hrs) | Rs. 187,000 – 218,000 |
| 1 x Narada/Inverex 5.12kWh Lithium | ~4.6kWh (7-9 hrs) | Rs. 180,000 – 260,000 |
| 2 x 5.12kWh Lithium | ~9.2kWh (full night + AC) | Rs. 360,000 – 520,000 |
What You Can Actually Run
With roughly 4.5kWh of usable backup, whether from tubular or lithium, you can comfortably run 5-6 LED lights, 3 ceiling fans, a WiFi router, and a fridge for about 7-8 hours. Add a 1.5 ton inverter AC into the mix, and that same battery bank drops to 2-3 hours of AC runtime alongside the basics, since an inverter AC alone can pull 700-1000W continuously. If running an AC through the night is the goal, you need to size up to the 9kWh+ tier shown in the table above, or accept that the AC is only for daytime direct solar use, not battery backup.
Frequently Asked Questions
How many 200Ah batteries do I need for a 5kW solar system?
Most 5kW systems use 2 to 4 batteries of 200Ah each, depending on your inverter’s voltage (24V or 48V) and how many hours of backup you want. Two batteries cover basic short backup, while four batteries give you 6-8 hours for a fuller household load.
Can I use just one battery for a 5kW solar system?
Only if you go with a single lithium battery (around 5kWh), since one unit can match the storage that would otherwise take 3-4 tubular batteries. With a single tubular battery, you would only get 1-2 hours of light backup, which is not enough for most households.
Does a 5kW solar system need a battery at all?
No, not if you go on-grid with net metering and don’t need backup during outages. Skipping the battery lowers your upfront cost significantly, but you get no power at all during load shedding since on-grid systems shut off with the grid for safety. Most Pakistani homes add a battery specifically to keep the lights on during outages.
