Thanks for looking at this quality BLA marine part.  If this part does not have an image or does not have a detailed description (below) you will find it by looking in the relevant 2020 BLA Catalogue located at this link.

Please Note: We Sell by Part Number Only.  Images can be generic and may not represent the actual product.  Check in the 2020 BLA Catalogue if you are unsure.

Shipping: Is generally the same day or next day by airbag or road transport.  There are two shipping options for freight up to 3 kilos.  Parcels over 3 kilos generally go road transport.  If your freight is bulky, oversize or heavy then there may be additional freight charges.  You will be advised of these costs and billed in arrears.

Availability: Assume that the part is in stock.  If the product is unavailable you will quickly receive an email or phone call with options or an immediate refund.

Returns:  BLA parts cannot be returned, nor exchanged nor refunded and are considered a special order.  Where an order is accepted back, a Return Authorisation must be approved and a restocking fee may apply.

Dual battery charging made easy

  • Automatically charges two separate battery banks
  • Protects electronics from harsh start up spikes
  • Protects start batteries from becoming flattened by domestic loads

Digital Voltage Sensing Relay DVSR Features:
Charging: The DVSR is connected between two battery banks.  When the DVSR senses a charging voltage (13.4V26.8V) on either of the batteries it automatically activates and joins the two battery banks together so they charge as one bank.

  • Allows charging of two independent battery banks from one charge source
  • Provides priority charging to engine starting batteries before combining second battery bank for charging
  • Dual sensing- the DVSR senses both of the connected batteries and will activate when a charging voltage is present on either battery


Please see below link for manual

INST-DVSR manual

See details below.


SKU 113668