Vesselview battery voltage

J

jmauld

Well-Known Member
Jun 9, 2020
2,844
Carolina Beach
Boat Info
2010 Sundancer 390
2016 Sea Hunt Ultra 211
Engines
Twin 8.1l of gas guzzling iron
My vesselview displays the battery voltage about 1V low. Is this normal or should I start chasing down a poor connection?

Also I had an over temperature warning occur on both engines nearly at the same time yesterday. The dash gauges showed 175 but vesselview was reporting 183 and 185. Seems a little suspect that both engines would overheat at once.
 
What is the actual voltage number your reading as "1v low" ? Is the reading with charging system active, engines running, no load, etc ? Where are you comparing voltage values from ? As far as temp readings, most engines normal operating range is upwards of 180 degrees, some over 200 degrees. Again where are you getting your comparative numbers from ? A little more detailed info will result in a more accurate answer.
 
The vesselview screen reads 11.5 V and 11.9 V

multimeter directly on the batteries reads 12.5 and 12.7 V.

The temperatures were the temps on the dash gauges vs. the numbers the vesselview displayed.

There was also another fault message that I didn’t capture correctly. Something about null or nullify.
 
I don't think Smartcraft has sensors directly on the batteries, rather, it is reporting the voltage the ECM is seeing at the engine. If you can do it, I think the apples-to-apples measurement would be from a reading off the engine battery cable inputs. In any event, I think you want to check for corrosion and good connections on all the engine power cables, including the starters.
 
I’m working on memory. I had guests on the boat and was more focused on the over temp issue. I’ll do more digging this week.

batteries are about four months old.
 
12.5-12.7 is pretty normal with engines off and charged batteries.
Measure the voltage at the breaker on your engine, that’s what your ecm should see.
 
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