Newmar BI-24-100 24v Battery Integrator
Newmar BI-24-100 24v Battery Integrator — Product description
Imagine heading out on a long offshore voyage or a cross-country RV adventure, only to worry about your engine start battery draining dry because it's tied to your house bank's heavy loads. That's where a smart battery integrator like the Newmar BI-24-100 steps in, revolutionizing how you manage power in 24-volt systems. This isn't just another switch—it's an intelligent guardian that seamlessly connects your battery banks for charging and isolates them during use, ensuring every amp counts without wasteful voltage drops or unwanted cross-discharge.
Traditional setups often rely on diode isolators, which introduce efficiency losses as heat, robbing your batteries of precious charge. The BI-24-100 flips the script with a heavy-duty, low-resistance contactor that delivers full charging voltage straight to both banks, maximizing battery health and runtime.
Unlock Reliable Power Management for Demanding Environments
In marine, RV, or off-grid setups, power reliability is non-negotiable. The BI-24-100 automatically senses charging voltage—engaging at around 26.4 VDC or higher from your alternator, solar, or shore power—and unites your banks into one massive reserve. When loads kick in or chargers shut off, it isolates them instantly, protecting your start battery from house inverters or appliances.
- Zero Voltage Drop: Silver-plated contacts handle 100 amps continuous duty without the heat or inefficiency of diodes.
- Full Isolation: Prevents the common "dumping" where a charged battery feeds a depleted one, extending overall system life.
- Boost Capability: Wire it to your starter for emergency assist from the house bank when cranking the engine.
- Marine-Tough Build: Epoxy-sealed electronics and rugged solenoids shrug off salt spray, vibration, and moisture.
How It Intelligently Handles Your 24V Battery Banks
At its core, the BI-24-100 monitors system voltage via a precise sense circuit. Here's the simple cycle:
- Charge Mode: Detects 26.4+ VDC → Closes contactor → Banks charge as one.
- Discharge Mode: Voltage drops below threshold (typically ~13.0 VDC) → Opens contactor → Banks isolated for independent use.
- Manual Override: Optional key-start or switch input for on-demand connection.
For multi-bank systems, daisy-chain additional units—one per extra bank—to scale effortlessly. Pair it with inverter-chargers to feed both house and start batteries from a single AC source, then revert to house-only draw during inversion.
Pro Tip: In solar-heavy installs, this prevents your controller's output from being backfed, optimizing every panel's contribution.
Effortless Setup for DIY Enthusiasts and Pros
Designed for real-world installs, its compact footprint fits anywhere—upright, inverted, or sideways. A straightforward three-wire hookup (two positives and ground) gets dual banks running in minutes:
- Connect primary battery + to terminal 1.
- Secondary battery + to terminal 2.
- Ground to chassis or negative bus.
- Optional: Remote LED for visual status; starter wire for boost.
No complex programming or apps—just plug and power up. Its sealed design means no worries about corrosion in engine bays or wet bilges.
Perfect for Marine, RV, and Off-Grid Powerhouses
Whether you're running trolling motors and radars on a sportfisher, inverters and AC in an RV, or pumps and lights off-grid, the BI-24-100 shines:
- Boats & Yachts: Keeps start battery primed while house bank powers nav gear.
- RVs & Campers: Isolates during generator-free boondocking.
- Custom Builds: Scales to three-plus banks for heavy-duty trolling or work trucks.
Users rave about fewer dead starts and longer battery lifespans, turning power headaches into seamless adventures.
Frequently Asked Questions
What makes the BI-24-100 better than a traditional diode battery isolator?
Unlike diodes that cause a 0.7-1V drop and generate heat, the BI-24-100 uses a low-resistance contactor for 100% efficient charging with full isolation when not needed, preserving battery charge and reducing wear.
At what voltage does the battery integrator connect the banks?
It engages the contactor at approximately 26.4 VDC or higher for 24V systems, ensuring only true charging sources link the banks, and disconnects below the threshold to protect against low-voltage discharge.
Can this handle systems with more than two battery banks?
Yes, add one BI-24-100 per additional bank to maintain the same smart integration and isolation across three or more banks.
Is the boost feature useful, and how does it work?
Absolutely—wire it through the starter circuit for automatic assist. If the house bank has sufficient voltage, it temporarily links for extra cranking power on cold mornings or weak starts.
How rugged is it for harsh marine conditions?
Built for the extremes: epoxy-encapsulated sense circuit, continuous-duty solenoid, and silver-plated contacts resist corrosion, vibration, and humidity in engine rooms or exposed mounts.
What's the easiest way to monitor when banks are connected?
Use the dedicated terminal to wire a remote LED indicator—it lights up only when the contactor closes, giving you at-a-glance status at your helm or dash.
Does it work with inverter-chargers?
Perfectly—it multiplies a single inverter-charger's output to charge both banks, then isolates during inversion so loads pull solely from the house bank.
Use of multiple battery banks dictates that the batteries be connected or "integrated" only whenever a charge voltage is present so that they may be charged simultaneously, then disconnected or "isolated" when in use to allow for selective discharge and avoid having the secondary or standby battery drain into the primary battery.
The new Battery Integrator performs this function automatically, acting as a "smart" switch to connect independent battery banks only when a charging voltage is present. Otherwise, they are isolated, and discharge between banks is prevented.
The traditional rugged and reliable diode isolator can also be used for this function, as it also maintains isolation between banks and allows charging from multiple sources. However, one drawback is inefficiency when voltage is lost as current passes through the diodes, resulting in undercharge if the charging source does not compensate for the voltage drop.
The Battery Integrator remedies this by use of an extremely low resistance contactor which causes no voltage drop in the charging system, while the multiple batteries are charged as a single bank whenever a charging source of approximately 13.2 VDC or 26.4 VDC or greater is present (depending on model).
When the alternator or charger is off or a large load causes the voltage to drop below the disconnect point the unit breaks the common tie between the banks. This allows selective battery discharge and prevents "dumping" of a higher-charged bank into a lower-charged bank.
The unit may also be activated through the key starter or a manual switch to provide an added "boost" from the secondary battery whenever the starter is engaged and the unit senses there is sufficient voltage in that battery to provide an assist.
For systems with more than two banks, an additional unit may be installed for each additional bank to provide the same isolation and integration as described above.
The Battery Integrator is ideal for multiplying the single charging output of an inverter-charger to maintain both the house bank and an engine start bank, then to isolate them during inverter function, so current is drawn from the house bank only.
Features
- Enables charging of two separate banks without voltage drop, yet maintains 100% isolation at all other times. For systems of three banks or more, an additional unit may be installed for each additional bank
- Heavy duty silver-plated contactor, continuous duty rated to 100 amps
- Voltage sense circuit, epoxy encapsulated and heavy duty continuous rated solenoid are all designed for use in marine environments
- Easy-to-install: compact size - may be mounted with any orientation
- Easy three-wire hook up for two bank systems (BATT +, BATT +, GROUND)
- Terminal for optional wiring of remote light indicating when battery banks are integrated
- Optional internal connection can be wired though key starter or manual over ride switch, tying battery banks together for extra boost during engine start
SKU: NVN-1002892
MPN: BI-24-100
UPC:
Technical specifications
| Brand | NewMar |
| Model | Newmar BI-24-100 24v Battery Integrator |
| SKU / MFR# | 1002892 |
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Frequently asked questions
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