Samlex Battery Charger

Samlex SEC Series: Smart Battery Charging Built for the Long Haul

When it comes to protecting your battery investment, few names carry as much credibility as Samlex America. Their lineup of battery chargers — centered on the well-regarded SEC Series — represents a disciplined engineering approach to multi-stage smart charging that appeals to RV owners, boaters, communications professionals, and off-grid enthusiasts alike.

The SEC Series: Multi-Stage Charging with Serious Versatility

The flagship of Samlex's battery charging lineup is the SEC Series, a family of fully automatic, three-stage chargers available in both 12V and 24V configurations. Charging rates span from 15 amps to 80 amps depending on the model, giving users the flexibility to match output to battery bank size. What sets the SEC Series apart is the depth of its configurability: each unit is user-selectable via DIP switch for 2- or 3-stage charging profiles, and can be set for flooded, AGM, or gel cell battery chemistries without any tools beyond a small switch adjustment.

A standout feature across the SEC line is the ability to function as a DC power supply — not just a charger. This dual-purpose capability makes these units popular in UPS (battery backup) setups, communications sites, and even robotics test environments. Larger models like the SEC-1280UL also include a Half Power Mode that reduces maximum charging current by 50%, allowing safe conditioning of smaller or more sensitive battery banks.

Switch-Mode Technology: Efficient, Lightweight, and Quiet

Samlex battery chargers employ switch-mode technology, which delivers highly efficient and quiet operation compared to older transformer-based designs. This translates into chargers that are notably lighter and more compact — an important consideration for marine and RV installations where space and weight matter. The output is well-filtered, which is part of why these units can double as clean DC power supplies.

Built-In Protections and Global Compatibility

Every unit in the SEC lineup is engineered with overload, short-circuit, over-temperature, and reverse polarity protections. LED monitoring makes it easy to assess charge status at a glance. The chargers are also internally configurable for 120 VAC or 230 VAC input, making them suitable for both North American and international applications. Select models include a temperature sensor to prevent under- or overcharging when ambient conditions fluctuate — a critical safeguard for batteries stored in engine bays or uninsulated compartments.

Multi-Bank Charging Without Isolators

For applications with more than one battery bank — common on larger boats, RVs, and commercial vehicles — several SEC models support simultaneous charging of up to three separate banks, with no isolators required. This simplifies installation significantly and reduces the total component count in complex DC power systems.

Where Samlex Chargers Excel

• Marine & RV: Compact, multi-bank capable, and corrosion-resistant enough for demanding mobile environments
• Communications Sites: Reliable float charging for standby battery systems
• Off-Grid & Solar Backup: Pairs naturally with Samlex solar and inverter products in integrated DC power setups
• Industrial & OEM: Proven in military, homeland security, and R&D lab applications where consistent, stable DC output is non-negotiable

Whether you need a capable 15-amp maintainer for a single deep-cycle battery or a high-output 80-amp workhorse for a large battery bank, the Samlex SEC Series offers a thoughtfully engineered solution. Browse the full selection of battery chargers to find the right model for your voltage, amperage, and chemistry requirements.