Mastervolt - BI Series Battery Isolator
Got questions? Ask an expert!
Know someone who needs this?
Share it with your crew or mechanic.
Efficient Power Distribution for Marine Applications
The Mastervolt BI 1202-S Battery Isolator ensures seamless charge distribution with minimal energy loss, making it an ideal solution for marine electrical systems. Designed for onboard setups with multiple batteries, this isolator allows for independent charging, preventing unnecessary discharge between power sources.
Built with robust, corrosion-proof materials and advanced diode technology, it guarantees durability and reliable performance in demanding marine environments. The unit integrates seamlessly with Mastervolt Mass battery chargers and Alpha Pro charge regulators, which automatically compensate for voltage drops, ensuring optimal charging efficiency.
Advanced Diode Technology for Reliable Charging
The BI Series Battery Isolator utilizes diode-based charge splitting, allowing multiple batteries to receive power without interfering with each other. With a diode voltage drop compensation feature, it maintains efficient charge distribution while minimizing energy waste. The compact, solid-state design prevents wear, making it a maintenance-free solution for long-term use.
Technical Specifications
- Maximum Output (Battery Charger): 80 A
- Maximum Output (Alternator): 120 A
- Compensation Diode: Yes
Product Dimensions
- Height: 8.1 inches
- Width: 5.5 inches
- Depth: 3.1 inches
- Weight: 2.6 lbs
Durable and Corrosion-Resistant Construction
Designed for marine applications, the battery isolator is built with completely corrosion-proof materials and features aluminum heat sinks for efficient thermal management. The synthetic end plates and molded diode splitters provide additional protection against harsh conditions, ensuring longevity in demanding marine environments.
Key Features
- Divides charge current with minimal energy loss
- Compatible with 12V and 24V systems
- Solid-state construction eliminates wear and enhances durability
- Molded diode splitters for improved efficiency
- Easy installation with solid bolt connections, nuts, and locking rings
Variations Available
- Model 83012021: 120A, 2 Battery Outputs
- Model 83007021: 70A, 2 Battery Outputs
- Model 83007030: 70A, 3 Battery Outputs
The Mastervolt BI 1202-S Battery Isolator is an essential addition for marine electrical systems, ensuring reliable, independent battery charging while minimizing energy loss.
Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.
Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.
Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.
Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.
Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.
Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.
To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.
We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.
