SERVTEC: Professional Pylontech Battery Repair Service with Genuine Parts and Expert Support

Do you have a faulty Pylontech US2000, US3000, or US5000 battery?

We’re here to help.

Our Services

We specialize in repairing the following Pylontech US Series batteries:

• US2000, US2000B/Plus, US2000C
• US3000, US3000B/Plus, US3000C
• US5000C

With over 5 years of experience and hundreds of successful repairs, our dedicated workshop in Poole, Dorset, is equipped with custom-developed test equipment, jigs, and procedures to provide a fast and reliable service. We cater to both solar installers and end-users, offering tailored email support to meet your needs.

Why Batteries Fail

While Pylontech batteries are well-designed and robust, improper installation and system configuration often lead to faults. Using advanced diagnostics, we extract history and event logs from the Battery Management System (BMS) to identify when and why issues occurred. Common causes include:

Incorrect System Setup:

• Faults from day one due to misconfigured inverter settings or incorrect CANbus cables being used. 
• State of Charge (SOC) drops below safe limits, triggering alarms.
• Charge voltage set too high, causing cell swelling and blown BMS fuses.
• Discharge current exceeding limits, causing alarms and stressing battery cells.
• Low temperatures reducing charge currents.
• High temperatures damaging battery cells.

SOC Mismanagement:

• Prolonged float charging at 100% SOC, leading to swollen cells.
• Batteries left at 5-10% SOC during winter due to lack of grid charging, resulting in cell imbalance over time.

Seasonal Issues:

• Batteries failing to recharge fully in summer due to extended periods of low SOC during winter causing cell imbalance over time.  Resulting in not being able to charge to 100% SOC

 

Why Choose SERVTEC?

• Expert Diagnostics: Pinpoint faults with precision using advanced tools and techniques.
• Experience: Extensive expertise repairing Pylontech batteries for a range of clients.
• Genuine Parts: Repairs carried out with authentic Pylontech components to ensure reliability.
• Comprehensive Support: Assistance for both installers and end-users to prevent future issues.
• 12 Months warranty on replacement parts and labour.
• 3700+ Positive Reviews

Important Information Before Purchasing

Inspect Your Battery

Before purchasing this service, please carefully inspect your battery. If you notice any of the following signs of swelling or damage, please contact us before proceeding:

• Distorted metal lid.
• Ripples in the lid or back edges.
• Screws that have broken through the lid.

Shipping and Packaging

Once purchased, we will contact you to confirm your collection address. This service includes collection and return shipping.

Packaging:

• If possible, package your battery in its original packaging.
• If original packaging is unavailable, we can provide an empty box for a small additional charge (please contact us to arrange this).

Collection Details:

• Our courier will collect the battery from your home or work address at your convenience.
• Collections are scheduled between 9:00 AM - 5:00 PM, but we are unable to provide a specific time window.  Please provide contact details for the courier.

Diagnostics and Repair Process

When your battery arrives at our workshop, we will:

Fault Analysis:

• Extract history and error logs to determine the fault and its origin.
• For unique error codes or specific requirements, we consult directly with Pylontech for additional support.

Cell Imbalance Check:

• Measure the Internal Resistance (IR) of individual cells to assess potential damage.
• Typically, the BMS shuts down the battery before significant damage occurs.

Understanding the US2000C Battery Configuration

• A US2000C battery contains three black battery packs connected in series.
• Each pack consists of 10 cells (3.2V, 25Ah nominal), arranged as 2P5S. Combined, this forms a 2P15S configuration with 48V nominal voltage and 50Ah capacity.
• During charging, the inverter should supply 53.2V at 25A. Any cell imbalance due to slightly mismatched IR values may cause one cell to reach its upper voltage limit before the others, prompting the BMS to halt charging and activate passive balancing.
• Passive balancing can take hours to weeks, depending on the level of imbalance.

Active Balancing and Repairs

 

To address cell imbalance:

1. Battery Pack Removal:

• We remove the three packs and connect them to specialized active balance chargers.
• Using professional equipment, we balance all packs within a few hours to a precision of 1-2mV.

2. BMS Calibration:

• Reinstall the balanced packs, allowing the BMS to recalibrate and fully charge the battery to 100% SOC.

3. Discharge Testing:

• Discharge the battery from 100% to 20% SOC at 10A.
• Review cell imbalance at 20% SOC and recharge to 40% SOC for shipping readiness.

BMS Replacement (If Selected)

 

If BMS replacement is requested:

• We replace the BMS with a genuine Pylontech part, program the serial number, capacity, reset the SOC and set the time and date.

Completion and Return

Once the repair is successful:

• We will contact you to confirm the repair and arrange a convenient return date.
• Our professional and thorough process ensures your battery is restored to optimal performance. Contact us if you have any questions or specific requirements.

Self-Installation Option

If you choose to purchase a replacement BMS for self-installation, we will supply a brand-new, genuine Pylontech CCMU for US2000/3000/5000 models or a CMU & PMU for US2000/3000 Plus models. A comprehensive fitting guide is included to assist you throughout the installation process.

The fitting guide provides clear, step-by-step instructions on the correct sequence for connecting cables and connectors, ensuring the BMS is not damaged during reinstallation.

Programming Requirements

After installing the replacement PCB, you will need a USB programming adapter to configure the following attributes:

• Serial number
• Time and date
• Cell capacity
• Reset SOC

You can use your own RS232 cable or purchase one of our programming kits for convenience.

Warranty Information

All replacement parts come with a 12-month warranty. However, failure to follow the fitting guide correctly will void the warranty.