Bluetti is presently selling the new AC500 which allows up to 5 kW at 120 VAC and the new B300S battery which supplies 3 kWh, but this new setup allows connecting six batterirs for up to 9 kWh per AC500 and up to 18 kWh in split phase mode of 5kW at 240 VAC.
Here is the direct Bluetti page link: https://www.bluettipower.com/pages/ac500b300s
And here is the direct YouTube link about the touch screen:
Watch at 0:37 for the six battery display and at 3:54 for the latest firmware numbers.
I learned about the AC500 from Mike the after-sales engineer from Maxoak.
It will be probably offered soon. The only engineering needed is to replace the male TT-30 plugs for the TT-50 and the female L14-30 with the 50 A equivalent. The face plate will be changed and the insides will be moved due to the larger connectors and cables. But on the general looks, it will not change much.
It won’t be offered anytime soon. I’ve already checked and they said as of now it’s not something they’ll be offering. However it does have a standard 50A RV receptacle… even though it looks like a 240v outlet, I would be it’s only powering one plug at 120v… therefore like my pervious comment we can make a y-adapter to connect the two 50 amp outlets together and create our own 240 inlet for the transfer switch.
Remember that you can only produce true 240 VAC power if the two 120 VAC lines are sychronized at 180 degrees of opposite phase. If not, the output voltage will not be 240 VAC, but lesser. So you still need the communications cable between the two AC500 units, setup as split phase, and setting one as Master and the other as Slave.
The Fusion Box has a special logic board to indicate if the two lines are synchonized and at opposite phases. Someone might be able to reverse engineer it.
For me the heating element is useless, but the good part is tbe software that can read, charge and discharge six batteries per AC500 unit. We have to wait until someone can analyze and reverse engineer the code and add a patch to the AC300 to manage more than four B300 batteries. Sixteen may be the practical limit.
And maybe someone can decipher the AC300 to B300 communications protocol, so you can add a third party or home made LFP battery to the AC300. The B300 uses sixteen cells in series for 51.2 VDC at 60 Ah.
Where there is a will (desire) they is a way (action). The curious will find the interface or the code as the warranty expires, but the risk takers will try sooner. Finding how to add more B300 in parallel may be a big motivation point, but adding a third party or your own group of LFP cells may motive many, such as myself. If I find something, I will post it here.