Two different inverters fed from same battery bank?

I currently have a single 6000xp running off of four lifepower batteries. I was thinking of adding a second inverter to help with running my two 2.5 ton AC's this summer, as I don't like pushing a HF inverter too hard with inductive loads. The obvious and simple solution is to add a second 6000xp but I was actually considering adding a LF inverter. SS has the Growatt 12kw LF inverter on sale and am considering to use that for the motor loads in my house. Is there any way they can share the four lifepower batteries? Since the Growatt can only accept 145 volts PV, and my current array is way over that I was thinking having the XP running all PV input to the batteries and the Growatt running the heavy loads, with only battery input going to the Growatt and PV only to the XP.

Currently, All the batteries are in a server rack connected to the bus bars and all communications are connected to the 6000xp. Maybe all the batteries can stay connected to the same bus, with both inverters connected to the same bus, but two batteries communicating with the XP and the other two batteries connected to the Growatt? Is that possible?

I would not do that.

Is this a grid tied system? If so, does can this new inverter "communicate" with the current to set phases and voltage? I don't think two different brands or even models of inverters from the same company can communicate.

If this is not grid tied, then the loads would need to be separated.

If the 6000XP is communicating with the battery bank and the XP is handling all charging functions then should work ok to connect the LF to the whole bank with no comms.

The bank will still see the loss of SOC and still report it to the XP. The XP and bank afaik do not do any kind of comparison of consumption that would lead them to get upset about the "missing" power.

As @chrisski says loads will need to be separated and you will need to be able to competently handle the neutral considerations. It's not complicated, but it might be some high effort wiring.

I would get a second 6000xp for simplicity.

If adding the Grow watt I would leave coms hooked to the 6000xp and not the grow watt. I was going to do this with a 3000ehv-48 and just tack on a Victron Phoenix.

Won't be a problem, as long as the AC is completely separate.
Leave everything as is, and just add the Growatt as a load to the batteries.

But, it would be better to just add a second 6kxp, for simplicity and redundancy.

Yes you can add more inverters to the same battery bank. The question of if you want to parallel them for a common AC output would require them to be capable of running this way. If only powering separate circuits than all that matters is your battery and your connections will be able to handle the power needs of the two devices.

You do not want battery communications with the inverter/AIO that is not handling charging tasks. Since you are not hooking it up to its own array it is simply a dumb device for taking DC and inverting it to AC.

chrisski said:

I would not do that.

Is this a grid tied system? If so, does can this new inverter "communicate" with the current to set phases and voltage? I don't think two different brands or even models of inverters from the same company can communicate.

If this is not grid tied, then the loads would need to be separated.

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The loads would be separated between the two different inverters. I have two reliance 10 circuit transfer switches. If I went the Growatt route instead of adding a second XP, I would run another set of AC output wires to the other transfer switch to keep the AC output separated between the XP and growatt

timselectric said:

But, it would be better to just add a second 6kxp, for simplicity and redundancy.

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I'm kind of leaning that way. Alot of guys have that set up and it seems bulletproof.

Do you think adding a second Xp in parallel would help solve the problem of light bulbs flickering during motor/compressor inrush?

Kent86 said:

I'm kind of leaning that way. Alot of guys have that set up and it seems bulletproof.

Do you think adding a second Xp in parallel would help solve the problem of light bulbs flickering during motor/compressor inrush?

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I assume it would help. Because the loads will be split across two.
But, it depends on what is causing the flickering.
If the flickering happens at low loading, it could actually make it worse.