What does a voltage sensitive relay do?

What does a voltage sensitive relay 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.

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 voltage sensitive relays work both ways?

VSR Operation: The Voltage Sensitive Relay (VSR) allows two batteries to be charged at the same time. How the VSR works: Once the starting battery’s voltage rise to above 13.7 VDC, the VSR switches to charge both batteries in parallel, when the voltage drops below 12.8 VDC the VSR disengages.

Can I 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 DC VSR for DC charger?

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. It is really important to understand that a VSR is “NOT” a battery charger.

Can you use solar with VSR?

You have a few options to choose from, an isolator or voltage-sensitive relay (VSR), solar panel charging system or combining the two, a DC to DC charger that has both vehicle and solar input charging capabilities. Learn about battery chargers.

Do you need a VSR If you have a DCDC 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. The only real exception is vehicles with fixed output alternators that provide a constant output voltage over 14.2V and with a similar or same battery to the cranking battery.

Can you use a VSR with a smart alternator?

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

Do I need a VSR if I have a DCDC charger?