Hi All

Is it ok to keep my to shoto 5.12 batteries connected to 8kw Deye charged all the time and only use when no sun or eskom?

Will this expand the lifetime of my batteries?

I am not concerned about the money savings by using the batteries during night time.

Edited February 4, 20233 yr by ChrisPret

It's a good idea to cycle them daily. In fact, it's a warranty requirement for some batteries. This is needed for cell balancing, and also because battery life is reduced when kept fully charged.

Given your above statement, I would set them to cycle down to 80, or 70% SoC daily.

Do you have some sort of graph like this that we can look at?

See the batteries charge up during the day when there's PV, then they discharge at night, whether or not there is grid. Green line is SOC. That's the sort of thing that you want to see.

I could set mine to discharge only when there is no grid and no PV but
a) it's not really good for the batteries
b) no saving. My home is running off of PV and/or battery nearly all the time, so I save lots, and I have protection against load shedding.

I have 10kWh of battery. But if I had half of that, I'd still be sitting with 10% left in the early morning. What you need to do is minimise your loads when the sun is down.

On 2023/02/04 at 1:55 PM, P1000 said:

It's a good idea to cycle them daily. In fact, it's a warranty requirement for some batteries. This is needed for cell balancing, and also because battery life is reduced when kept fully charged.

Given your above statement, I would set them to cycle down to 80, or 70% SoC daily.

Thanks, I heard its bad for the batteries just wanted confirmation

On 2023/02/04 at 2:12 PM, Bobster. said:

Do you have some sort of graph like this that we can look at?

See the batteries charge up during the day when there's PV, then they discharge at night, whether or not there is grid. Green line is SOC. That's the sort of thing that you want to see.

I could set mine to discharge only when there is no grid and no PV but
a) it's not really good for the batteries
b) no saving. My home is running off of PV and/or battery nearly all the time, so I save lots, and I have protection against load shedding.

I have 10kWh of battery. But if I had half of that, I'd still be sitting with 10% left in the early morning. What you need to do is minimise your loads when the sun is down.

Thanks Bobster

On 2023/02/04 at 1:55 PM, P1000 said:

It's a good idea to cycle them daily. In fact, it's a warranty requirement for some batteries. This is needed for cell balancing, and also because battery life is reduced when kept fully charged.

Given your above statement, I would set them to cycle down to 80, or 70% SoC daily

Removed. 

Edited February 5, 20233 yr by Scorp007