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Old 10-20-2020, 06:51 PM   #1
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Voltage Question

2021 Winnebago bumper pull toy hauler .. Spyder .. here goes .. we have 2 6 volt batteries mounted on the tongue .. there is 1 solar panel on the roof .. there is a converter only .. inside the trailer and according to the RV tech .. the converter does charge the battery while the generator is running and also on shore power ... HOWEVER if left on Shore power for extended periods of time .. it will over charge the batteries and would ruin them .. with that being said .. we want to connect a simple Volt meter to the battery .. that way we will have a current reading of how many volts that batters are at .. SO .. if we are off shore power and the generator is not running BUT the solar is producing .. will the Volt meter read the battery voltage or will it read what is being produced by the solar panel ?
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Old 10-20-2020, 07:26 PM   #2
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The solar and battery are in parallel so the voltage reading will be the same.

Post the model of the converter/charger. It might be smart enough to leave connected full time but you still have to check battery water levels monthly if they have removable caps.
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Old 10-20-2020, 09:30 PM   #3
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You can buy a solar charge controller for not much money. That's the first step I would take.

Also, you could buy a basic charger/maintainer and run it off an outlet that is live when on shore or genset. That will bring them up and hold them on float. It seems odd that the on-board charger/converter doesn't go to a float mode.

Remeber the voltage you will read while the battery is charging will be higher than the true resting voltage. At rest the voltage will be around 12.6 at 100%, and 12.06 at 50%.
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Old 10-21-2020, 10:47 AM   #4
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Remeber the voltage you will read while the battery is charging will be higher than the true resting voltage. At rest the voltage will be around 12.6 at 100%, and 12.06 at 50%.
Ok .. so in daylight hours when the solar panel is charging the volt meter will read what is coming into the battery .. after the sun goes down .. the reading the volt meter shows will actually be the true resting voltage .. am I understanding this ?
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Old 10-21-2020, 10:53 AM   #5
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Correct, after a few hours of darkness, with nothing on, you can read resting voltage.

Nothing electrical, you can have clothes on
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Old 10-21-2020, 12:01 PM   #6
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Battery charging

Adding a voltmeter is a good idea. Learning what it means is also important.

There are three basic voltage profiles. They are charging, discharging, and static. Static means neither charging nor discharging for a while. For accurate static reading wait 4 hours after charging has stopped. Watching the voltmeter will teach you how long it takes before voltage stabilizes.

Charging voltage profile is a combination of charger (either converter or solar) and the batteries used. It starts at the existing voltage and slowly rises. High capacity chargers raise the voltage faster. Smaller batteries raise faster.

Voltage usually raises to more than 13.0 volts. I had an older one that rose to 13.3 volts and stayed there. The one I have now is more complected. It raises to 14.4 volts for 4 hours then drops to 13.6 volts. After a few days of stable current, it drops to 13.2 volts.

13.2 volts is great for long term storage for all lead acid batteries including AGM batteries. 13.6 is OK long term for flooded cell batteries. 14.4 volts for longer periods will damage AGM batteries and will cause flooded cell batteries to consume lots of water. 15.0 volts is sometimes used on flooded cell batteries to "condition", "equalize", or recover from storing at low voltages. Don't do this for long periods. Don't do this on most AGM's. Always check and refill water levels after high voltage charging.

I wish you good luck and happy trails ahead!

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Old 10-21-2020, 02:32 PM   #7
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2021 RV with a 'stupid' converter.........DOUBT it!!

It is at least a 3 stage converter/charger and maybe a 4 stage version
It CAN be left ON 24/7
One just needs to pay attention to battery water levels until you know if it is overcharging

RV Tech must not have CHECKED which Brand/Model of converter you have to have made such a statement

My 2007 5th wheel is plugged in 24/7 when parked at that batteries STAY charged
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Old 10-23-2020, 10:42 AM   #8
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twinboat ... Shhhhh ! Not to loud the wife might hear you !
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