Mastervolt BI 1203-S Isolator
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Estimated Delivery:Nov 11 - Nov 15
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Free Shipping: On all orders over $150
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Mastervolt BI 1203-S Isolator
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BI 1203-S Isolator
Onboard systems usually consist of two or more batteries that function independently when powering the 12 or 24V consumers. These batteries require independent charging with reliable battery isolators or battery combiners.
Mastervolt offers several intelligent solutions:
- Battery isolators that divide your charge current with a minimum energy loss.
- The Charge Mate for connecting and/or disconnecting two batteries.
- Battery Watch for monitoring the condition of your batteries (also usable as the main switch).
Battery isolators for conventional systems with an alternator or battery charger and two or three batteries
Mastervolt’s BI battery isolators are based on conventional diode technology. The diode voltage drop (ca. 0.6 V) can be compensated for by adapting the output voltage of the connected charger or alternator. Mastervolt Mass battery chargers and Alpha Pro charge regulators are standardly equipped with automatic voltage drop compensation.
Compact and lightweight
The Mastervolt BI battery isolators are compact and fully solid-state, preventing wear. The weight varies from 580 to 1300 grams.
Robust and durable
Completely corrosion-proof material with aluminum heat sinks. The electronic components are encased in synthetic materials, the BI models have molded diode splitters.
Fast installation
The synthetic end plates feature connection lugs, the solid bolt connections with nuts and locking rings ensure easy installation.
Shipping Policy
Thank you for choosing Outdoors.Supply. We aim to deliver your gear efficiently and reliably.
Carriers
We ship all orders via UPS Ground or FedEx Ground, depending on availability and destination.
Shipping Rates
- Orders under $150: Flat shipping rate of $15
- Orders $150 and above: Free shipping
Note: A handling fee of $7.50 may apply to certain items. If applicable, it will be clearly stated during checkout.
Order Processing
- Orders placed before 12:00 PM ET (Monday–Friday): Processed the same business day
- Orders placed after 12:00 PM ET or on weekends/holidays: Processed the next business day
Delivery Time
All orders are delivered within 3–7 business days from the date of shipment, depending on your location.
For any questions or concerns about your order, please contact us at [hello@outdoors.supply]. We’re here to help!
Discover more in our FAQ
How long does it take to process an order?
All orders are processed the same business day if placed before 12 PM EST. Orders placed after 12 PM EST are processed the following business day.
Do you ship internationally?
No! Currently we are only supporting shipments to contiguous United States. We do not ship to PO Boxes or Internationally.
What is your return policy?
No Returns
Due to the nature of our products and our commitment to ensuring the highest quality standards, we do not accept any returns under any circumstances.
No Refunds
We do not offer refunds for any reason, including but not limited to:
- Change of mind
- Incorrect size or style ordered
- Delayed shipping
- Product dissatisfaction
Please refer to our Refund Policy
What are your sizing options?
We have a size chart displayed on most products to reflect the sizing as accurate as possible. Please review the size chart and ensure you are leveraging the closest size possible.
Let customers speak for us
Reliable and sturdy—held up well under rough conditions.
Exactly what I needed for my last trip. No complaints!
Solid value for the money. No regrets at all.
Solid value for the money. No regrets at all.
It made a big difference in my outdoor experience.
Reliable and sturdy—held up well under rough conditions.
Performs better than I expected. Worth every penny.
Comfortable and well-designed. Would definitely buy again.
Performs better than I expected. Worth every penny.
I was pleasantly surprised by the durability and performance.
Shipped quickly and arrived in perfect condition.
Exactly what I needed for my last trip. No complaints!
I was pleasantly surprised by the durability and performance.
Exactly what I needed for my last trip. No complaints!
A fantastic product with great features and reliability.
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Why You'll Love Mastervolt BI 1203-S Isolator
Premium Quality
Mastervolt is known for exceptional quality and attention to detail in every product.
Fast Shipping
Fast and reliable shipping to get your Mastervolt BI 1203-S Isolator to you quickly.
Satisfaction Guarantee
Quality guarantee ensures your satisfaction with every purchase.
Expert Support
Our dedicated support team is here to help with any questions about Mastervolt BI 1203-S Isolator.