I have an solar system installed about 5 years ago using an Axpert generic inverter (Mecer 5KVA) I have four 12 V 200Ah batteries installed. I have noticed lately that they just make the 2.5 h load shedding before they reach their limit where as before they easily lasted the 2.5 hours. I suspect they have reached the end of their lifetime. I need to know has anybody replaced their lead acid batteries with a Lithium battery on this inverter and what are your experience with it. I am thinking to buy a 10kWh Lithium battery instead of the four 12v lead-acid batteries. Any advice would be appreciated.

 

6 hours ago, Benji said:

I am thinking to buy a 10kWh Lithium battery instead of the four 12v lead-acid batteries. Any advice would be appreciated.

It's very advisable. All you have to do is to change (01) to SBU and then enter all the parameters for the battery.  You find those settings in various posts of the forum.

On 2022/02/05 at 3:36 PM, Benji said:

I have four 12 V 200Ah batteries installed.

Just pointing this out, but 12v 200Ah @ 50% DoD is 4.8kWh at best.  (probably 20 hour rating).  With Peukert's law you have even less capacity than that, but let's call it 4.8kWh to keep things simple.  Since it has lasted so long, I doubt you've been draining down to 50% every time.

10kWh Lithium is a bit overkill for you to be honest.  You could get a single 5kWh Lithium and call it a day.

I went from 4x 12v 100Ah to 5.8kWh Lithium.  I'm making coffee, watching TV (with home entertainment, etc. draining about 500w), got my lights on, vacuuming, all kinds of stuff and not even getting to 50% DoD on my Lithium battery.  When I was still on lead acid I was careful not to turn anything but lights on during load shedding and near the end barely made it through a load shedding (and couldn't do it twice in a day).  Lithium is a significant upgrade, I just don't even care what I turn on anymore, even during load shedding.

Edited February 7, 20224 yr by Gnome

On 2022/02/07 at 12:31 PM, Gnome said:

10kWh Lithium is a bit overkill for you to be honest.

In my opinion you can never have too much battery capacity. The more the better. Think of two or more cloudy days in row.

47 minutes ago, Beat said:

In my opinion you can never have too much battery capacity. The more the better. Think of two or more cloudy days in row.

Well you can have too much if you have limited funds 😛  I also sort of got the impression OP is just using this for backup purposes, not solar (which is the same as my case)

Edited February 8, 20224 yr by Gnome

It seems like OP knows what 10kw lithium will cost. Yes they work well. Setting 01 can be changed to any setting.  The USR profile must just be used to set the voltages for lithium instead of the pre defined profiles.