BT13L Coulomb Meter 30A Automatic Battery Charge & Discharge Controller

Stop guessing your battery's health — the BT13L Coulomb Meter gives you complete, real-time control over every charge and discharge cycle.

The BT13L is a professional-grade all-in-one battery charge and discharge controller designed for serious energy users. It measures voltage (0.01V resolution), current (0.01A resolution), capacity in Ah, energy in Wh, state-of-charge percentage (SOC%), runtime, and temperature — all displayed simultaneously on a clear backlit LCD. Whether you're running a lithium battery bank, a solar energy system, an inverter, or a UPS setup, this device gives you the full picture at a glance.

What sets the BT13L apart is its built-in dual 30A relay system that automatically disconnects the load on over-discharge and cuts off charging on overcharge — no manual intervention needed. The bi-directional coulomb counting engine tracks both incoming and outgoing current with high precision, so your SOC reading stays accurate even after hundreds of cycles. It supports 12V, 24V, 48V and any DC system from 10V to 110V, covering virtually every battery chemistry including lithium iron phosphate (LiFePO4) and lead-acid. For advanced users, Modbus RS485 and optional Wi-Fi modules enable remote monitoring and automation integration. Built to operate reliably from -10°C to 60°C, it's equally at home in a solar room, battery enclosure, or outdoor cabinet.

Ideal for solar installers, EV hobbyists, off-grid homeowners, and electronics engineers who demand accuracy and protection in one compact unit. Backed by a 1-year warranty from amiciKart — India's trusted electronics store. Order before 2 PM for same-day dispatch, with free shipping across India and easy 30-day returns.

• Protect your battery investment automatically — dual 30A relays intelligently prevent overcharge, over-discharge, and deep cycling damage without manual intervention
• Monitor everything at a glance — high-precision LCD displays real-time voltage (0.01V), current (0.01A), SOC%, capacity (Ah), energy (Wh), runtime, and temperature simultaneously
• Compatible with virtually any DC battery system — supports 10V to 110V DC, making it ideal for 12V, 24V, and 48V lithium, lead-acid, solar, inverter, and UPS setups across India
• Never lose track of true battery health — bi-directional coulomb counting accurately measures both charge and discharge current for reliable state-of-charge data and smarter energy planning
• Scale up to remote monitoring effortlessly — Modbus communication with optional RS485 or Wi-Fi modules lets you automate and monitor your battery system from anywhere
• Engineered for tough Indian conditions — operates reliably from -10°C to 60°C, suitable for solar rooms, battery enclosures, workshops, and outdoor energy installations
• Buy with complete confidence — backed by 1-year warranty from amiciKart, 30-day no-questions-asked returns, free pan-India shipping, same-day dispatch (orders before 2 PM), and COD available