Description
xVictron BCD 402 Diode Battery Combiner – 2 Batteries, 40A
The Victron BCD 402 is a diode-based battery combiner designed to charge two separate battery banks from a single charging source without allowing the banks to discharge into each other. It is suited to marine, vehicle and off-grid installations where battery isolation between banks is required alongside simultaneous charging.
Key Features
- Combines two battery banks with a single 40A continuous current rating per output.
- Diode-based design ensures complete electrical isolation between battery banks, preventing cross-discharge.
- Allows a single alternator or charger to charge both banks simultaneously.
- Compact and lightweight at 0.49 kg, suitable for installation in confined spaces.
- No moving parts or mechanical contacts, reducing maintenance requirements over time.
- Compatible with standard 12V and 24V battery systems.
Product Overview
The BCD 402 uses Schottky diodes to split a single charging source across two battery banks. Current flows from the charger or alternator to both banks, but the diodes block any reverse flow between the banks themselves. This means a depleted starter battery cannot draw down a service or leisure battery, and vice versa.
One practical consideration with diode combiners is the voltage drop across the diodes, typically around 0.5V to 0.7V. This means the charging voltage reaching the batteries will be slightly lower than the source output. In systems using a Victron charger or a smart alternator regulator, this can be compensated by adjusting the charge voltage setpoint accordingly. Installers should account for this when commissioning the system.
The BCD 402 handles up to 40A, making it appropriate for moderate charging loads from a vehicle alternator or a shore power charger in a two-bank configuration. It is not intended for high-current applications such as large inverter charging banks.
Specifications
- SKU: BCD000402000
- GTIN: 8719076020967
- Configuration: 1 input, 2 battery outputs
- Continuous current rating: 40A
- Weight: 0.49 kg
Applications
- Marine installations requiring separate starter and service battery banks charged from a single alternator.
- Campervans and motorhomes with a split-charge system between engine and leisure batteries.
- Off-grid cabins or vehicles where two battery banks are charged from one solar charge controller or charger output.
- Light commercial vehicles with auxiliary battery banks for refrigeration or equipment loads.
What Is Included
- 1 x Victron BCD 402 diode battery combiner
Installation Notes
Installation should be carried out by a qualified electrician or experienced marine/vehicle electrical installer. Ensure the wiring to and from the combiner is rated for at least 40A continuous and is appropriately fused on the input side. Account for the diode voltage drop when setting charge voltage on the source device. The unit should be mounted in a dry, ventilated location away from direct heat sources.
Return Policy
xWe offer a 14-day, no-quibble returns or replacement policy because we want you to be totally satisfied with your purchase.
If you are unhappy in any way with your purchase, you can return it for a refund or a replacement, as long as you return it in the same condition as it arrived (original/undamaged packaging and product) and within 30 days of receiving it. We will pay for your return postage on a faulty item as long as you send it using Royal Mail 2nd class recorded delivery (for EU or International Shipments, you have to use our UPS account, we will provide you with a return label)
Please keep in mind the following:
- Items returned within 14 days but not in their original and undamaged packaging will also incur a -15% charge per package.
- If you return an item that doesn't adhere to our returns procedure or doesn't include a returns form, you may be liable for a £10 administration fee
- Individual items from a bundle can't be returned, refunded or exchanged. If you want a refund/credit/exchange for a bundle, all items must be returned to us.
Before you return your item, please make sure that:
- You follow our returns process (outlined below)
- The goods and packaging are undamaged
IMPORTANT: We need to be able to identify an item with your order. We can only do this if you follow our returns process. Please do not send us items back that do not follow this process as they cannot be identified properly and will not be replaced or refunded.
What delivery method do I need to use when returning an item?
You must send the goods back to us via Royal Mail 2nd class recorded delivery. Refunds on faulty items returned are reimbursed within 5 working days.
Can I return just one item from multiple purchases?
Yes. Once you start the returns process you will go to a page that will allow you to choose which items you want to be replaced or refunded.
Returning faulty goods
If your item is faulty, you need to follow the returns policy, where you will be able to state that it’s faulty. The product will then arrive at our warehouse for testing.
If your purchase is not within 14 days
You can still exchange your item for a different product or for credit to use on the Voltacon Solar or Ledison-led-lights.co.uk websites (-15% from the credit amount).
Returns outside of the 14-day period do not qualify for the free returns policy.
Returning an item within the warranty
If you have a warranty and want to return a faulty item, you just need to follow our standard returns process. When we receive your item, we will then check that it’s within warranty and for any faults before arranging a replacement.