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Old 04-01-2019, 01:36 PM   #1
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Voltage Sensitive Relay issue

My trawler has a BEP Marine VSR that should combine the start & house batteries when the alternator produces 13.7 VDC or more. During a trip yesterday, I tested the start & house batteries with the following results:
Start battery: 13.88 VDC
House batteries: 13.08 VDC
Am I correct to assume that the BEP VSR is not functioning properly & should be replaced? If so, any recommendations for a new brand & model of VSR?
Thanks.
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Old 04-01-2019, 01:51 PM   #2
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You could easily have a 0.18 volt error in your measuring device or the VSR was set a little high or both.


A VSR that pulls in at 13.7 sounds too low in any case. Many alternators don't get that high, maybe 13.5.


I like Yandina.com combiners. Their combiners are set to pull in at 13.3 V.



David
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Old 04-01-2019, 01:54 PM   #3
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At 13.08 volts something is charging the house battery bank. Check the voltage several hours after beginning the cruise to see if the voltage is closer to the start battery. Also test the voltage drop across the vsr contacts
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Old 04-01-2019, 02:26 PM   #4
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House banks are usually larger and get discharged more than the start batteries so it may take quite a bit longer to bring the house bank up to full charge. How long had you run the boat when you checked the voltage?
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Old 04-01-2019, 02:57 PM   #5
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Also, you best test the VSR function at the VSR, not the batteries. House charge load can be very high, causing V drop in the cables. Seems there may not be an issue at all; but am a bit far away to know for sure!
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Old 04-02-2019, 06:19 AM   #6
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Plan "B" might be an $18.00 RV solenoid.


When the engine runs it closes , doesn't give a damn about hundredths of a volt , it simply merges the banks.
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Old 04-04-2019, 10:32 AM   #7
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Quote:
Originally Posted by High Wire View Post
At 13.08 volts something is charging the house battery bank. Check the voltage several hours after beginning the cruise to see if the voltage is closer to the start battery. Also test the voltage drop across the vsr contacts
The voltages were checked about 2 hours after beginning the cruise.
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Old 04-04-2019, 10:36 AM   #8
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Quote:
Originally Posted by Comodave View Post
House banks are usually larger and get discharged more than the start batteries so it may take quite a bit longer to bring the house bank up to full charge. How long had you run the boat when you checked the voltage?
The start and house battery bank were being charged by the automatic battery charger until the shore power cord was disconnected. The voltage was checked about 2 hours after starting the cruise.
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