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Renogy wrote me this: An over-discharge return voltage is the voltage where the controller will charge it up to after the battery is over-discharged -> lower than just discharged. Lower than 11V

I asked Renogy what to set since lithium-ion batteries should not be float charged or have equalized charging voltage and they told me to put the lowest possible which happens to be 9V. Thank you for the advice though. I will try that.

That is for Lifepo4 not lithium-ion. Big difference. Thank you for trying though.

I am not using my battery at all : D . I am just trying to charge it. It has 0 things hooked up to it. It does not have a BMS currently because it is made entirely out of brand new 18650 batteries charged to the same voltage.

The battery is at about 11.4V at the moment. Do you mean higher voltage from the solar panel? I am a bit confused how it could be too low from the battery.

I have a questions regarding the installation of an external battery to an electric scooter. I watched this video "" in which they put an extra battery connected externally in parallel with the onboard battery. 1. Is that okey to do if the batteries are at different states of charge when...

Hello, I bought a Renogy 40A MPPT solar controller. I have a lithium-ion battery at 12.6V. (currently charged at 11.2V) I have entered the voltages: Equalizing voltage=9V, Boost voltage=12,6V Floating charging voltage=9V, Over-discharge voltage=11V, Over-discharge return voltage=10.5V, The...

It is charging. It just gives me an error at the same time.

It didn't work.

If someone has a Renogy MPPT controller with lithium-ion batteries, please help ?

Thank you. I actually made an external battery for my electric scooter and used it, but was always concerned, about using two batteries in parallel at the same time since one of them did not have a bms( I just balance charged the battery every time and only used one at a time).

It's ok. Thank you for the suggestion. I'm pretty sure it is not that, but I will check tomorrow.