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Old 05-13-2024, 05:23 PM   #1
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Eco worthy lithium batteries

Purchased 2 eco worthy 12.8v batteries for my 2016 jayco 5th wheel so will they charge properly when I plug my trailer cable running my generator? Iím reading mixed reviews, I heard no issues just wonít charge to 100%
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Old 05-14-2024, 07:25 AM   #2
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Purchased 2 eco worthy 12.8v batteries for my 2016 jayco 5th wheel so will they charge properly when I plug my trailer cable running my generator? Iím reading mixed reviews, I heard no issues just wonít charge to 100%
Correct. You will get it partially charged (most find about 80ish percent without a lithium-compatible charger). At 80%, you will see more useful power capacity than most fully charged lead acid batteries at a much reduced weight.
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Old 05-14-2024, 08:39 AM   #3
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Battery

Awesome thank you
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Old 05-14-2024, 08:52 AM   #4
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Awesome thank you
You are welcome. If you are going to be plugged in, you could always get a dedicated Lithium charger and shut off the breaker for your converter. That would ensure the batteries are fully charged.
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Old 05-14-2024, 10:12 AM   #5
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Before I finished my solar installation I left my Renogy battery connected to the RV built in non-lithium charging system. It charged up to 80% is a couple hours from 45%. Then slowly crept up to near 100% over a few days. I wasn't watching it as I was in the driveway working on solar and other stuff.
After I added 200 watts of Renogy solar and MPPT i turned off the breaker as my solar keeps me up to 100% daily in almost every time I have used my RV.
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Old 05-14-2024, 10:33 AM   #6
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I just installed a lithium battery last week. It has charged to 100% while plugged in at home, from about 65% charge to 100% charge took a little over 8 hrs. My converter will need a jumper for better charging for lithium batteries and Progressive Dynamic is sending me one free of charge in the mail. So time will tell.
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Old 05-14-2024, 10:34 AM   #7
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Just FYI, most LifePo4 batteries have a resting voltage around 13.3~13.4 when fully charged. However, to charge a battery you need a higher voltage than the resting voltage so somewhere around 13.6 will still charge a LifePo4 battery and above that, say around 13.8v you can fully charge a 12v LifePo4 battery. The difference is similar to filling a water tank though and as your use lower and lower pressure, the tank will take a lot longer to fill but will become full (assuming no one is using water).

Point being, even at 13.8 you can fully charge a LifePo4 but for the fastest charge, ~14.4v is common. Also, it is good to charge a Lifepo4 to 14.4 every few months if you use a lower voltage charging device as some Lifepo4's only balance the internal cells once the voltage is up above ~14v.

So, understanding whether a particular RV converter can fully charge a LifePo4 battery requires knowing the charge voltage and profile of the converter. Those converters designed for LifePo4's generally charge at 14.2 ~14.4v and those designed for Lead Acid batteries may have a higher voltage for the bulk charge and lower for the absorption stage, therefore it is best to lookup the charge profile (specs) for the installed converter. Some converters offer more control of the settings than others, so even one that has a constant output of 13.8v could work well, just a bit slower in fully charging a LifePo4 battery. ~CA
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Old 05-14-2024, 02:49 PM   #8
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Thx Colby do you mean I could just get a portable lithium charger and hook them up to my batteries and charge them but shut off my power first of course
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Old 05-14-2024, 08:48 PM   #9
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I don't have any qualifications other than I just went thru a lithium conversion with some good advice and help, especially from Craigav. He knows his stuff. I changed from 2 6 volts lead acids to a single Renogy 200ah lithium. My Progressive Dynamics power center/charger/converter did not have a lithium setting. By pulling the 3 reverse polarity fuses on the PD the charger is disabled. I went with a stand alone charger mounted in the battery cabinet that has a setting for lithium, an absorption charge at 14.2 volts and storage at 13.5 volts. Recommended absorption charge for the Renogy is 14.4 +- .2 volts and 100% charge is 13.6. Keeping it just below the full charge is close enough for me. It still has more grunt the 2 lead acids ever had.

You could get by with a portable charger designed for lithium batteries but I would think you would want something more hands free.
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Old 05-14-2024, 08:52 PM   #10
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Thx Colby do you mean I could just get a portable lithium charger and hook them up to my batteries and charge them but shut off my power first of course
Yes, the only thing you would need to watch for is if the charger has enough current to replace the output from the converter which does double duty to keep the 12v lights and stuff on plus charge the battery.
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Old 05-15-2024, 05:36 AM   #11
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The charge rate on our as delivered LiFePO4 compatible power center is in the 50 amp range. That is with very little additional 12v draw. Haven’t tried with lights and heater running.
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