Need advice switch to Lithium from AGM.

[Bigbadben]

So I am looking into converting my AGM battery setup to Life4po server rack batteries.

I have one Growatt 5000 es and one Growatt 6000 es plus. 5000 runs my pool pump. 6000 runs my house load. They are independent of each other.

The common battery consists of two parallel strings of 150 ah AGM batteries, with battery equalizers. The DC bus feeds each inverter with equal length battery cables.

Is it possible to install a server rack life4po battery rack and share the DC bus connection to both inverters without using the CAN/485 comms connection.

I have been told by Growatt you cannot share the DC bus with dissimilar Growatt inverters when using lithium server rack batteries. They must communicate with the comms port on the server rack battery.

Any advice on this matter would be greatly appreciated.

I live in Costa Rica so moving to lithium is a very costly proposition for me.

Thank you. Ben

 

[timselectric]

Is it possible to install a server rack life4po battery rack and share the DC bus connection to both inverters without using the CAN/485 comms connection.

Yes, communications is not a requirement.

I have been told by Growatt you cannot share the DC bus with dissimilar Growatt inverters when using lithium server rack batteries. They must communicate with the comms port on the server rack battery.

Maybe they didn't understand the question.

 

[Suijkerbuijk]

Oke this are thing you have to know by switch battery.

Lead battery do not have bms .
Lifepo4 have a bms and that have a continuous output .
That bms output have to match with your inverters max input of ampère it use .
You can use series setup of lifepo4 to make 24/48 volts .
Personal i go for a lifepo4 battery that al ready is that volts .
Reason the bms from one in series can shutdown by cell un balance and shutdown the series string .
This can be charge or even discharge.

Lifepo4 battery in parallel is not a big problem.
Boths battery will balance them self.
If one is lower the other battery will charge back the other one.
Somting i see in my own parallel setup .
Both battery discharge and charge are not the same.
Reason no battery is the same even if its the same brand.
The internal resistance can be different so that small charge and discharge are different by parallel and series by Charging the cells

 

[Glock24]

You don't need communication with the inverter for the system to work properly. You only have yto configure the inverter as if it were a lead-acid battery but setting the propper voltages for your lithium battery.

You have to keep in mind the following:

* Limit charging current to the specs of the battery.
* Do not exceed max amp draw from the battery or it'll disconnect and possibly damage the inverter. Some inverters get damaged when you disconnect the battery without fist disconnecting the solar array.

I don't think you can enable communications with two different inverters and a single battery, especially with Growatt inverters.

It is preferred to have a single 48V battery than several 12 or 24V batteries in series because they'll get out of balance.

If you choose to get lithium batteries in series then get a battery balancer to minimize problems.

 

[Bigbadben]

Thank you for all the replies. I figured something was not right when I was told by Growatt that sharing the battery bus between two dissimilar Growatt inverters was not possible.

So basically I can select whatever Lifepo4 server rack 51.2 battery I can get in Costa Rica and I'm good to go using user or user2 parameters in each Growatt inverter?

Would the HA02 be acceptable for a battery balancer as I already have them.

The best option for me lithium wise here in CR is attached. Not much information online about this product. So I'm kind of winging it.

Thank you all for your help, it is really appreciate. Ben

 

[timselectric]

So basically I can select whatever Lifepo4 server rack 51.2 battery I can get in Costa Rica and I'm good to go using user or user2 parameters in each Growatt inverter?

Correct

Would the HA02 be acceptable for a battery balancer as I already have them.

You don't need a battery balancer. If you use the correct voltage batteries. It's only necessary for 12v batteries in series.

 

[Bigbadben]

Thanks very much Tim. You are a wonderful asset to this forum. Cheers Ben

 

[Bigbadben]

Any idea what type of cells being utilized here?

Any comments from the resident experts? Many thanks to all that have replied to my thread.