Hi Powerforum community,We're excited to offer a very competitively priced, decent quality 51.2V 300Ah (15.36kWh) floor-standing LiFePO4 energy storage battery – Model KNY-P51300 from KNYSE Energy (part of the reputable Chilwee Group).This is a solid, no nonsense battery that delivers great performance at a price that stands out in the current market.Key Advanced Features:

• Active BMS with smart balancing, multi-layer protection (over-charge, over-discharge, over-current, short-circuit, temperature, low-voltage)

• Bluetooth & WiFi connectivity for convenient remote monitoring and app-based management via your phone

• Flexible remote upgrade capability

• 1C continuous charge/discharge rate (up to 200A max)

• Wide inverter compatibility – officially supported/listed on all major inverter brands (Solis,Sunsynk, Deye, Victron, Goodwe, Growatt, etc.)

• CAN / RS485 / RS232 communication protocols

• Parallel up to 15 units (scalable to over 230kWh)

• Ultra safe LiFePO4 chemistry with 10-year warranty

• IP20 rating, sheet metal enclosure, floor-standing with wheels for easy installation

• Active balancing + low self-consumption for maximum efficiency and lifespan

Performance & Longevity:

• 6000 cycles @ 80% DoD – that’s a very long service life (potentially 15+ years of daily use in a typical solar setup)

• Recommended 100A charge/discharge (200A max)

• Operating temp: Charging 055°C | Discharging -60°C

Warranty & Support:

• Full 10-year warranty

• 2-day swap-out service (fast local support)

• Backed by an established South African distributor with strong after sales support

Price:
R29 095 VAT included (excluding delivery)This is genuinely one of the best-priced 15kWh-class batteries available right now while still offering modern features like active BMS, Bluetooth/WiFi, and broad inverter compatibility.

Perfect for residential solar, backup power, or scaling up existing systems.For quotes, shipping options, compatibility checks, or to secure stock,

contact Wimpie on 067 189 7084 (WhatsApp & calls)
or email [email protected] Serious buyers only reply below or contact Wimpie directly.

Powerforum Store
Reliable solar energy solutions

KNY51300_Floor type Energy Storage Battery (1).pdf

Edited Wednesday at 09:095 days by Powerforum Store

Update this Price has gone up now to R29 095 Vat Included

Edited May 6May 6 by Powerforum Store

We installed two of these in parallel in May 2026 - replacing 5x Pylontech 3000C - good balance, no errors, much longer battery time. Very happy with the purchase!

Our inverters are dumb - voltronic/axpert MKS-5 - so we are using "Solar Assistant" on a Pi-3 to do the heavy lifting. Also very happy!

Edited Wednesday at 10:535 days by David at SolutionCentre
3000c not 300c

Hi

How do I order 1

Rob

Just send Wimpie a WA.

he will sort you.

I have a Sunsyk 8kW inverter with 2 x 5,12kW Volta stage 1 x 5,12 kW batteries. Can I add this KNY-P51300 15.36kWh Floor-Type LiFePO4 Battery too the system? What problems could occur and is there a better option? Many thanks PJ

On 2026/06/25 at 9:24 AM, swalesrob said:

Hi

How do I order 1

Rob

contact Wimpie on 067 189 7084 (WhatsApp & calls)
or email [email protected] Serious buyers only reply below or contact Wimpie directly.

14 hours ago, PJ Garbutt said:

I have a Sunsyk 8kW inverter with 2 x 5,12kW Volta stage 1 x 5,12 kW batteries. Can I add this KNY-P51300 15.36kWh Floor-Type LiFePO4 Battery too the system? What problems could occur and is there a better option? Many thanks PJ

Hi @PJ Garbutt ,Thanks for reaching out.

Yes, the KNY-P51300 15.36kWh is one of our popular floor-standing units and is marketed as compatible with Sunsynk/Deye inverters (CAN/RS485, 200A BMS, Pylontech-style protocol often works well).It is technically possible to add it in parallel to your existing 3× Volta Stage 1 5.12kWh batteries.

All are 51.2V LiFePO4, so voltage matches, and many users run mixed-capacity banks successfully via a common busbar.

However, we must caution strongly:

• Mixing different brands and capacities (15kWh + 3×5kWh) is not recommended for optimal performance. You may see uneven charging/discharging, where the big KNY pack carries more current, and the smaller Voltas reach limits first. This can reduce overall efficiency and lifespan slightly over time.

• BMS communication: The inverter might only talk fully to one master battery. The rest could run voltage-based. Proper cable, protocol selection (often #0 or similar on Sunsynk), and initial balancing are essential. Test thoroughly.

• Warranties: We do not know if this will affect your Volta or Sunsynk warranties (or the KNY’s 10-year warranty). Many manufacturers prefer same-brand banks. Please check directly with Volta/Sunsynk support and your installer.

If you still want to proceed, we can supply the KNY-P51300 with the right comms cable guidance.

Ideally, for peace of mind and best results, consider adding matching Volta batteries or going all-in on KNY units (they parallel nicely up to 15).Happy to discuss specs, pricing, or alternatives just let me know your location or what you’re aiming for (more backup, etc.).

Regards,
@Powerforum Store

3 hours ago, Powerforum Store said:

Hi @PJ Garbutt ,Thanks for reaching out.

Yes, the KNY-P51300 15.36kWh is one of our popular floor-standing units and is marketed as compatible with Sunsynk/Deye inverters (CAN/RS485, 200A BMS, Pylontech-style protocol often works well).It is technically possible to add it in parallel to your existing 3× Volta Stage 1 5.12kWh batteries.

All are 51.2V LiFePO4, so voltage matches, and many users run mixed-capacity banks successfully via a common busbar.

However, we must caution strongly:

• Mixing different brands and capacities (15kWh + 3×5kWh) is not recommended for optimal performance. You may see uneven charging/discharging, where the big KNY pack carries more current, and the smaller Voltas reach limits first. This can reduce overall efficiency and lifespan slightly over time.

• BMS communication: The inverter might only talk fully to one master battery. The rest could run voltage-based. Proper cable, protocol selection (often #0 or similar on Sunsynk), and initial balancing are essential. Test thoroughly.

• Warranties: We do not know if this will affect your Volta or Sunsynk warranties (or the KNY’s 10-year warranty). Many manufacturers prefer same-brand banks. Please check directly with Volta/Sunsynk support and your installer.

If you still want to proceed, we can supply the KNY-P51300 with the right comms cable guidance.

Ideally, for peace of mind and best results, consider adding matching Volta batteries or going all-in on KNY units (they parallel nicely up to 15).Happy to discuss specs, pricing, or alternatives just let me know your location or what you’re aiming for (more backup, etc.).

Regards,
@Powerforum Store

Does this unit allow max charge voltage adjustment and full soc% adjustments?

27 minutes ago, Stefan Cornelissen said:

Does this unit allow max charge voltage adjustment and full soc% adjustments?

Yes, the KNY-P51300 has a smart/active BMS that supports adjustments, but with some practical limitations.

Key Details:

• Max Charge Voltage: Fixed/recommended at 58V (typical for 16S LiFePO4), with a hard max of 58.4V. The BMS has built-in over-charge protection at this level. You cannot freely "dial in" a custom max voltage like on some open JK/Seplos DIY BMS units.

• The inverter (Sunsynk) will control charging voltage, and the BMS will protect if it exceeds safe limits.

• SOC% Adjustments & Full Charge Behaviour:

  • The BMS calculates SOC based on voltage, current, and coulomb counting. It typically reports 100% SOC once it reaches the absorption voltage (around 58V) and current tapers off.

  • Many users can fine-tune SOC calibration indirectly via the inverter settings or (if available) Bluetooth/WiFi app for the BMS. It has active balancing and protections that help it reach true full SOC reliably.

  • Full 100% adjustments are not as flexible as premium DIY BMS (no arbitrary SOC offset in most cases), but it performs well for "full" cycles when the inverter is set correctly.

In Practice with Your Sunsynk Setup:

• With CAN communication working, the inverter reads the BMS SOC directly and follows its guidance you set your desired min/max SOC% in the Sunsynk menus (e.g., charge to 95-100%, discharge to 20%).

• Without perfect comms, fall back to user-defined voltage settings on the inverter (e.g., bulk/absorb 56-57V, float ~54V).

Overall: It’s a good “set and forget” smart BMS for most residential users, but not as tweakable as high-end programmable ones. If you need very precise custom voltage/SOC tuning, a different battery or external BMS might be better.