JK Smart BMS 4S-8S 40A
JK Smart BMS for 4S-8S lithium packs, 40 A continuous, 0.4 A active balancing.
🚚 Free delivery across India · dispatch in 1–2 working days
This product is sold without any warranty. Only damaged, defective or wrong items are replaced within 7 days of delivery.
इस प्रोडक्ट पर कोई वारंटी नहीं है। सिर्फ़ टूटा हुआ, ख़राब या ग़लत प्रोडक्ट डिलीवरी के 7 दिन के अंदर बदला जाता है।
Specifications
| Brand | JK BMS |
| Type | Smart BMS with active balancing |
| Series (cell count) | 4S to 8S |
| Continuous Discharge Current | 40 A |
| Active Balance Current | 0.4 A |
| LiFePO4 pack voltage | 12.8 V (4S) to 25.6 V (8S) |
Key Features
- Active cell balancing (0.4 A)
- For 4S to 8S lithium packs
- 40 A continuous discharge
- Bluetooth app monitoring
Product Description
The JK Smart BMS 4S-8S 40A is a JK BMS part for 4S-8S lithium battery packs - for example a 8S LiFePO4 pack (25.6 V) - drawing up to 40 A continuously. Active cell balancing (0.4 A). For 4S to 8S lithium packs. 40 A continuous discharge. Bluetooth app monitoring. Sold and shipped by PowerRun Industries with free pan-India delivery. PowerRun does not offer a separate warranty on JK parts; damaged, defective or wrong items are replaced within 7 days of delivery as per our refund policy. Not sure which model fits your pack? Send us your cell type, series count (S) and current on WhatsApp and we will help you choose.
SIZING & FIT GUIDE
साइज़ और फ़िट गाइड
Which packs this BMS fits
Pack voltages for LiFePO4 cells (3.2 V nominal, 3.65 V full, 2.5 V cut-off per cell) and the continuous power the JK Smart BMS 4S-8S 40A can carry at its rated 40 A:
| Series | Nominal | Full charge | Cut-off | Power at 40 A | Typical use |
|---|---|---|---|---|---|
| 4S | 12.8 V | 14.6 V | 10.0 V | 512 W | 12 V systems, small UPS and solar lights |
| 8S | 25.6 V | 29.2 V | 20.0 V | 1.0 kW | 24 V inverters, 3.6-4.2 kW hybrid inverters, solar storage |
Inverter, cable and fuse
On a 8S pack (25.6 V) the BMS passes up to about 1.0 kW, so it suits an inverter or motor controller drawing no more than about 1.0 kW from the battery (about 922 W of AC output at 90% inverter efficiency). For the main battery leads use at least 6 mm² (10 AWG) copper cable and a 50 A DC fuse or breaker; if your load pulls more than 40 A for long, choose a higher-current BMS.
8S पैक (25.6 V) पर यह BMS लगभग 1.0 kW तक की पावर दे सकता है। मेन बैटरी केबल कम से कम 6 mm² (10 AWG) कॉपर रखें और 50 A का DC फ़्यूज़ लगाएँ।
Closest alternative: the JK Smart BMS 4S-8S 60A differs only in continuous discharge current 40 A here against 60 A, and this one costs ₹260 less than it.
Closest alternative: the JK Smart BMS 8S-20S 40A differs only in lifepo4 pack voltage 12.8 V (4S) to 25.6 V (8S) here against 25.6 V (8S) to 64.0 V (20S); series (cell count) 4S to 8S here against 8S to 20S, and this one costs ₹530 less than it.
Closest alternative: the JK Smart BMS 4S-8S 100A (1A Balance) differs only in active balance current 0.4 A here against 1 A; continuous discharge current 40 A here against 100 A, and this one costs ₹700 less than it.
Compare with similar models
| Model | Continuous discharge current | Active balance current | Price |
|---|---|---|---|
| JK Smart BMS 4S-8S 40A (this page) | 40 A | 0.4 A | ₹3,359 |
| JK Smart BMS 4S-8S 60A | 60 A | 0.4 A | ₹3,619 |
| JK Smart BMS 4S-8S 100A (1A Balance) | 100 A | 1 A | ₹4,059 |
| JK Smart BMS 4S-8S 200A (2A Balance) | 200 A | 2 A | ₹6,059 |
| JK Smart BMS 4S-8S 300A (2A Balance) | 300 A | 2 A | ₹8,949 |
Related guides
FREQUENTLY ASKED QUESTIONS
अक्सर पूछे जाने वाले सवाल
Is there a warranty on this product?क्या इस प्रोडक्ट पर वारंटी है?
No. This product is sold without any warranty. Only damaged, defective or wrong items are replaced within 7 days of delivery.
नहीं। इस प्रोडक्ट पर कोई वारंटी नहीं है। सिर्फ़ टूटा हुआ, ख़राब या ग़लत प्रोडक्ट डिलीवरी के 7 दिन के अंदर बदला जाता है।
How long does delivery take?डिलीवरी में कितना समय लगता है?
Orders are dispatched in 1-2 working days and delivered in 3-7 working days across India, with online order tracking.
ऑर्डर 1-2 वर्किंग दिनों में डिस्पैच होता है और पूरे भारत में 3-7 वर्किंग दिनों में डिलीवर हो जाता है। आप ऑर्डर को ऑनलाइन ट्रैक भी कर सकते हैं।
What if the product arrives damaged or defective?अगर प्रोडक्ट टूटा हुआ या ख़राब निकले तो?
Damaged, defective or wrong items are replaced within 7 days of delivery - see our refund policy for details.
टूटा हुआ, ख़राब या ग़लत प्रोडक्ट डिलीवरी के 7 दिन के अंदर बदल दिया जाता है। पूरी जानकारी हमारी रिफ़ंड पॉलिसी में है।
Can you help me choose the right model?क्या आप सही मॉडल चुनने में मदद करेंगे?
Yes. Message us on WhatsApp or call +91 80575 73040 with your load and backup needs and our team will suggest the right size.
हाँ। अपना लोड और कितने घंटे का बैकअप चाहिए, यह WhatsApp पर भेजें या +91 80575 73040 पर कॉल करें - हमारी टीम सही साइज़ बताएगी।