Maintaining lithium ion battery while not in use

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Nickus de Vos asked Feb 18, '19

Maintaining lithium ion battery while not in use

Hi all

I have a 4KWH li-ion battery in my camper with a SmartSolar MPPT 100/20 and a MultiPlus 12/1200/50. Sometimes I don't use the camper for a month or so, so I'm wondering what will be the best way to maintain the battery when not in use.

Should I simply leave the camper connected to mains electricity so that the Multiplus takes care of the battery, or should I rather connect a small solar panel to the SmartSolar for maintenance charging?

If solar, I was thinking to put a small solar panel on the roof of its parking spot, how big should this panel be, will a 30W panel giving around 1.6A be fine for this?

Lithium Battery

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robbo commented · Feb 18, 2019 at 07:07 PM

Lithium’s don’t like to be left at 100% charge (it’s actaully one of the worst things you can do to them), they like to be left at 50%, so if leaving for a long time I would disconnect totally and leave at 50% SoC.

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Answer 1 · 2019-02-18T21:08:03Z

boekel answered · Feb 18, 2019 at 09:08 PM

From the information that you have a 12 v system, you must have a LiFePO4 battery.

I'd set the MPPT charge voltage at 13 v, and turn off the Multi and any other users.

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