NewMar BI200 Battery Charger Equalizer

Unlock Seamless Power Management with the NewMar BI-200 Battery Integrator

Imagine powering your boat, RV, or off-grid setup without the frustration of uneven battery charging or unexpected drains between banks. The NewMar BI-200 steps in as your intelligent solution, automatically linking multiple 12-volt battery banks during charging and isolating them during use. This 200-amp powerhouse eliminates the need for bulky diode isolators, delivering efficient, drop-free charging that keeps every battery at peak performance.

Whether you're running house loads from a starter battery or maintaining a dedicated deep-cycle bank for trolling motors and accessories, the BI-200 senses charging voltage—typically around 13.2 volts—and ties banks together like a single unit. Drop below that threshold, and it smartly disconnects, preventing the higher-charged battery from feeding into a depleted one. It's like having a vigilant power butler that ensures selective discharge without constant monitoring.

How the NewMar BI-200 Works: Precision Control in Action

At its core, this battery integrator uses a relay-based design for zero voltage loss, unlike traditional diodes that rob precious energy through heat dissipation. Here's the cycle:

• Charge Mode: Detects alternator or shore power output above 13.2V, closes the relay, and charges all connected banks evenly.
• Isolation Mode: Voltage dips (engine off or heavy load), relay opens, banks stay separate to avoid cross-discharge.
• Boost Option: Wire through the starter circuit for emergency assist from aux batteries during cranking.

This automatic switching handles up to 200 amps continuously, making it robust for demanding setups like marine dual-bank systems or solar-hybrid RVs. No more undercharged house batteries pulling from your starter—freedom to run inverters, lights, or pumps independently.

Why Choose the BI-200 Over Diode Isolators? Real-World Advantages

Diode isolators have served mariners and overlanders for decades, but they come with a hidden cost: a 0.7-1.0V drop per bank, often leading to chronic undercharging unless your alternator compensates. The BI-200 bypasses this entirely, maximizing every amp from your charging source.

Users report longer battery life and fewer replacements, especially in vibration-heavy environments like boats or trucks. Its compact footprint—3 inches high, 3.25 inches wide, 2.5 inches deep, and just 1 pound—fits neatly behind panels without adding clutter.

Perfect Applications for Marine, RV, and Off-Grid Enthusiasts

Marine Use: Pair starter and house banks for reliable trolling or electronics without draining your cranking power.

RV Adventures: Integrate chassis and coach batteries, supporting boondocking with solar or generator inputs.

Solar & Overland: Manage aux batteries for winches, fridges, or lights alongside your primary pack.

Expand to three or more banks by adding units per pair—scalable protection for complex systems. Harsh conditions? Its rugged build shrugs off moisture, salt air, and jolts better than competitors.

Tips for Long-Term Performance and Troubleshooting

To get the most from your BI-200:

• Ensure clean, tight connections—corrosion kills efficiency.
• Monitor voltage with a multimeter during initial setup to verify thresholds.
• Avoid oversizing wires; match to 200A rating for minimal resistance.
• If it doesn't engage, check for low system voltage or faulty sensing leads.

Regular checks extend its lifespan, often outlasting the batteries it protects. Pro tip: In cold climates, it shines by preventing weak batteries from dragging down stronger ones.

Frequently Asked Questions