How low can deep cycle battery go

[Tantalus]

My batteries were renewed last year. I'm on 78% midday today and it's raining. How low is OK for overnight please?

 

[daveandsan]

Lead or Gel batteries?

 

[jongood]

My batteries were renewed last year. I'm on 78% midday today and it's raining. How low is OK for overnight please?

Most of them are Ok to 50% think Gels will go a bit lower or LifePO4 will go to 20%

 

[Gromett]

60% is considered ok for regular use.
Occasionally getting down to 50% won't do that much harm.

This is on the presumption it is a lead battery.

 

[Ditcha]

Most of them are Ok to 50% think Gels will go a bit lower or LifePO4 will go to 20%

Just had my LiFepo4 down to 12% no problem

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[jongood]

Just had my LiFepo4 down to 12% no problem

Did the BMS shut it off at that point?

 

[Ditcha]

Did the BMS shut it off at that point?

It was fine Jon I have the cell low voltage protect set to 2.60v and pack low voltage set to 10.4v.

Edit: that's just under 4% left in the battery before hitting 2.5v

 

[Jimbohorlicks]

Just had my LiFepo4 down to 12% no problem

It's that Diane again with the hairdryer.

 

[autorouter]

I thought the whole point of deep cycle batteries was that they would go down to about 20% without having any problems. Unlike repurposed starter batteries that start to shed their plate materials if they go below about 50%. As long as they are taken to 100% full about once a month to clean out the sulfation they should be fine.