What does a voltage sensitive relay module do?

The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. When the engine is started and the start battery reaches 13.7 volts, the VSR engages, allowing two battery banks (start and auxiliary) to be charged simultaneously.

Does a VSR work in both directions?

A VSR (voltage sensitive relay) is perfect for dual battery systems. They come in a single sense or a dual sense configuration for bi-directional charging.

Where do you mount a VSR?

Away from any hot or moving parts and as close to the main battery as possible. Use the mounting plate on the back of the VSR to mark and drill four holes, and secure the top right and lower left holes with the short screws.

Can you use a VSR with a smart alternator?

However, with a smart alternator, when the output voltage drops to below 12.8V a VSR would disengage, meaning that the auxiliary battery would have significant periods where it wouldn’t be charging, even though the engine would be running (some models of VSR may not engage at all, dependent on the on-board software).

Do you need a VSR If you have a DC DC charger?

Any circuit that includes an auxiliary battery that needs to be charged from an alternator source needs a DCDC charger and not a VSR. If you have a newer vehicle, run AGM or LiFePO4 batteries or any setup that is outside of the engine bay, then a DCDC charger is required instead of a VSR.

How does a DVSR work?

The Digital Voltage Sensing Relay (DVSR) allows the charging of a second battery bank from any single charging source. When charging stops and voltage falls, the DVSR automatically isolates the battery banks, ensuring that engine start batteries are kept fully charged.

Do you need a VSR If you have a DCDC charger?

Can a VSR charge a lithium battery?

Hi Geedublya, unfortunately, you can not use a Lithium battery with a VSR isolator, mine or any other brand.

Does a VSR work with a smart alternator?

VSRs can also engage and disengage frequently with the large and rapid voltage changes from a smart alternator and so the high current contacts may fail prematurely.

What is the difference between BCDC and DC-DC Chargers?

A BCDC charger is a DCDC charger, the “BCDC ” is the start of the REDARC part number and means Battery Charger Direct Current , for example BCDC1225D. I trust this will point you in the right direction. If you have further queries, I recommend you call REDARC Technical Support on 08 83224848.

What is a VSR relay used for?

A VSR (voltage sensitive relay) is perfect for dual battery systems. They come in a single sense or a dual sense configuration for bi-directional charging. Single sense VSR : When the engine is started, the starting battery and auxiliary batteries are separated allowing only the starting battery to be charged.

What does VSR stand for on Hella marine?

– Accessories, Relays – Hella Marine Voltage Sensitive Relay (VSR). The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. When the engine is started and the start battery reaches 13.7 volts, the VSR engages, allowing two battery banks (start and auxiliary) to be charged simultaneously.

What does VSR stand for?

Voltage Sensitive Relay (VSR). – Accessories, Relays – Hella Marine Voltage Sensitive Relay (VSR). The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. When the engine is started and the start battery reaches 13.7 volts, the VSR engages, allowing two battery banks (start and auxiliary) to be charged simultaneously.

How does a VSR work on a car battery?