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Set Magnum 2812 inverters for Lithum
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This is a solution for the Magnum setup to protect the Lithium batts while in storage.
Short answer, change the float voltage to 13.3 or 13.4 for storage. You can actually leave it there, but remember to initiate a manual charge if you are going to boondock for a while in order to bring them up to 100 %
Longer answer, and some context. You guys don’t know me. I am a new Marathon owner. My background is 20 years of Newell ownership and maintenance. I did ALL my own work.
Ten years ago I installed a 1000 A hr homemade LiFePo setup, and played around with the custom charge settings for a bit. Setting the float to 13.4 while in storage worked. I just sold the coach, and after 10 years of use the batteries still tested over the nameplate amp hrs. The point is my recommendation is not hear say.
One more thing, in the cheat sheet at the top of the post, it looks like you are terminating the charge based on return amps. BRAVO !
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
Art, pushing the batteries to 100% all the time will eventually harm your batteries. They don’t need or want o be at 100% all the time. On my Victron system, i can set my 100% charge to actually 90% of the capacity, same with the low end, I can set the cutoff at 10% to prevent an accidental full depletion.
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I don’t need to charge to 100% just want to charge to correct voltage, I have voltage set at 14.5v, The new DC to DC charger from the DN50 charges at 14.4 +or- 2 volts and it is a smart charger for LifePO4 batteries so driving it should be charged to correct volts and SOC
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How many amps at that Voltage?
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It has 2 settings 30amp or 60 amp
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Art, you might be doing yourself a disservice, 14+ volts even at 30 amps is too high at Float if your batteries are at or near 100% when you leave the house. Does your Battery charger monitor the SOC and reduce the amperage as needed? If not i would get another one. Lithium does not like lots of current at 100% state of charge.
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There are several chemistries all called lithium that behave differently. Lifepo4 and NMC are the two most common cells used in lithium batteries for RV house use. Charge/discharge behavior is different so it is a good idea to specify which is being discussed when it comes to charge profiles, depth of discharge recommendations, use in cold temps, float voltages, etc.
Jerry
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Ok here are specs on batteries 4 pics and here is specs on DC to DC charger(only for driving) when plugged in to AC power or running Generator charging with two Magnum 12v model 2812, Magnum ME-RC set to CC-CV set to14.5 1st- 4 pics on batteries 2nd 2 pics on DC to DC Charger
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
Here’s what I use for “Voltage vs SOC” for my Lifepo4 batts:
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Looks close to this chart in book, everything I’m doing now is for driving, My gen battery AGM is going to send volts to DC to DC charger set on LFP mode to charge new house batteries, will charge 14.6v
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Best of Luck Art, i hope you don’t destroy your batteries.
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