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 > advisability to turn off battery periodically

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Gdetrailer

PA

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Posted: 04/27/21 08:41pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Yes you can turn off the battery. If you don't move you don't even need a battery. Charging the otherwise unused battery every 1 to 3 months overnight is fine.

Yes the function of the WFCO is very poor. The linked converter should go to 13.2 volts after a few days.


Timeking wrote:

Thanks. I am full-time living in the TT, and still wonder why when connected to shore power 100% of time, that it is good and/or I need to keep charging the battery. Since I am constantly using light, pump, etc., the WFCO will never go into storage mode, but will always stay in absorption mode.



OP is fulltimer and will be "using" battery all the time and that is the problem, so pretty much negates any multistage converter from ever going into storage mode of 13.2V.

Typically multistage converters will have a specific amount of time after the last usage of current before it drops into storage.. OPs constant use of 12V items will prevent multi stage converters from seeing a lack of use long enough.. WFCO uses 44hrs of inactivity before dropping to storage.

Nothing "weak" about that for a WFCO and even the one listed above will have the same issue.

Op doesn't really need a battery at all if they are staying put and if that is the case the simple answer is to lose the battery.

theoldwizard1

SE MI

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Posted: 04/28/21 06:07am Link  |  Quote  |  Print  |  Notify Moderator

I have always been of the opinion that when a battery is in storage, it should not be charged more than 3-4 hours per day for maximum life. A cheap mechanical lamp timer and a "battery tender" will do the job !

valhalla360

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Posted: 04/28/21 06:54am Link  |  Quote  |  Print  |  Notify Moderator

If you are using the rig, unless you've disconnected all the 12v draws, you pretty much need to keep the charger on. Letting the battery run down low before recharging will wear it out faster than keeping it fully charged.

Check the water level once a month if you are worried.

Now if you have it in storage and plugged in...just make sure there are no 12v draws and it's fine...but then why leave it plugged in.


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valhalla360

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Posted: 04/28/21 06:57am Link  |  Quote  |  Print  |  Notify Moderator

Gdetrailer wrote:


Op doesn't really need a battery at all if they are staying put and if that is the case the simple answer is to lose the battery.


Until the park power goes out....

Also full time can include travel were he may need 12v when not plugged in.

Timeking

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Posted: 04/28/21 07:44am Link  |  Quote  |  Print  |  Notify Moderator

Full time but not stationary. To remind me to charge it I'll set up a task on my Outlook calendar. I think I will measure the batty voltage every day, and use that data to determine how often I should turn it "on" to charge. Of course, if in transit the battery will need to be on, which will be self-explanatory once I unplug and the jack won't go up!

According to BatteryUniversity, battery voltage fully charged is 12.9 (which it was yesterday) and should not be allowed to drop below 12.3, as below that the battery will sulfate. If this time to drop to 12.3 is longer than a month, I will charge once a month.

It seems a plus of all this, is that if the battery gets a little bit discharged, and I charge it, the WFCO will likely go into bulk mode, and 14.4v is supposedly high enough to address sulfation, i.e., a little bit of time being charged at 14.4 is better for the battery than getting 13.6 all the time. Maybe. I think that at one time I had a real "smart" multi-stage converter that would hit the battery with 14.4 every so often simply for that purpose.

pianotuna

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Posted: 04/28/21 07:56am Link  |  Quote  |  Print  |  Notify Moderator

Timeking wrote:

It seems a plus of all this, is that if the battery gets a little bit discharged, and I charge it, the WFCO will likely go into bulk mode, and 14.4v is supposedly high enough to address sulfation, i.e., a little bit of time being charged at 14.4 is better for the battery than getting 13.6 all the time. Maybe. I think that at one time I had a real "smart" multi-stage converter that would hit the battery with 14.4 every so often simply for that purpose.


All the kings horses and all the kings men, can't get a wfco to go into bulk.

The PD converters do 15 minutes every 20 hours @ 14.4, which "stirs" the electrolyte.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

valhalla360

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Posted: 04/28/21 10:52am Link  |  Quote  |  Print  |  Notify Moderator

Unless you have a large battery bank, which doesn't make a lot of sense if you are exclusively on shore power, is it really worth the hassle to stretch a single battery from 4-6yr life to 6-8yr life?

time2roll

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Posted: 04/28/21 11:40am Link  |  Quote  |  Print  |  Notify Moderator

Timeking wrote:

It seems a plus of all this, is that if the battery gets a little bit discharged, and I charge it, the WFCO will likely go into bulk mode, and 14.4v is supposedly high enough to address sulfation, i.e., a little bit of time being charged at 14.4 is better for the battery than getting 13.6 all the time. Maybe. I think that at one time I had a real "smart" multi-stage converter that would hit the battery with 14.4 every so often simply for that purpose.
Keep us posted on your quest to see 14.4 volts from the WFCO.

The converter I posted above always starts at 14.4


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Timeking

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Posted: 04/28/21 12:49pm Link  |  Quote  |  Print  |  Notify Moderator

From the WFCO manual:

If the output current reaches its maximum (normally caused by a discharged battery), this will cause the converter to go into Bulk Mode, which means the target output voltage will change to 14.4 VDC and a timer will start. Although the converter is outputting 14.4 VDC, you will not be able to read that on a voltmeter due to the voltage-current relationship. From the paragraph above, as load current increases, output voltage decreases. The actual output voltage will not rise until the load current is reduced, which happens naturally as the battery charges or if 12 VDC appliances are turned off.

Bulk Mode will be maintained until the current draw drops to approximately five Amps, or until the timer reaches four hours (whichever happens first). Then the target output voltage is changed back to 13.6 VDC for Absorption Mode. Lights that are powered from the output may change brightness slightly at that time

pianotuna

Regina, SK, Canada

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Posted: 04/28/21 02:45pm Link  |  Quote  |  Print  |  Notify Moderator

Timeking,

I know what the manual says. It's just that 99% of the folks here have never seen a wfco go into bulk.

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