Upgraded to 4 Victron Multiplus II 48v/5000kva in 120v Split Phase w/5 Ton EasyStart

I have upgraded from 2 Multiplus II 48v/5000kva inverters to 4 inverters in 120v split phase. L1 has a Master and a Slave so does L2 have a Master and a Slave. I also installed a Micro-Air ASY-368-X72-Blue on my 5 Ton Trane 2 stage heat pump. Nameplate LRA is 152.9, which is what I was getting without the Micro-Air installed. After 5 starts so EasyStart could learn, the amps were a consistent 28A with a run of about 11A. The 450v/200A solar charger just kicks butt compared to Growths or the 6500ex EG4 inverters. This thing is very efficient in producing kilowatts. I wanted to share with you guys since I have it up and running. Feel free to ask questions or provide feedback.

Looks great. How do you find the fan and transformer noise of the rs450 and the 5kVAs

At first the L1 fan noise was loud. I upgraded the firmware and it seemed to go away. However, I have not been putting much load on the system. I plan to load it up within next couple weeks. More to come on fan noise.

And a blue wire way ?

I would like to report some Victron porn .

Remember, when paralleling Victron inverters, the cables for each inverter must be exactly identical from master to slave on both the AC and DC side:

L1 #1 must match L1 #2
L2 #2 must match L2 #2
L1 need not match L2.

The inverters use the matching cable resistance for equal current sharing.

Also, ensure that you shut down the whole system before removing any of the battery cables to the inverters, and for good measure always remove the communication cables between the inverters before removing the battery cables.

HighTechLab said:

Also, ensure that you shut down the whole system before removing any of the battery cables to the inverters, and for good measure always remove the communication cables between the inverters before removing the battery cables.

Click to expand...

I'm not sure I follow what you are trying to say about removing battery cables? What is the concern trying to avoid?

Pretty, nice job, clean and reasonably neat. Seems like a lot of wall real estate for 20KW.of inverter and 10KW of panels, but I shant digress. The boxes seem very close to each otherl. One of the silly things about people mounting things on cement board that always strikes me. You have the equipment less than 3 inches from a wood wall and a plywood sheet. People do this all the time, the inverter "should be mounted on cement board", so we throw up a 3x5, then mount the inverter on the edge butted up close to a sheet of OSB or something. Not sure if the cement board is really buying you anything if you do that. I had a relatively small APC (500 or 750 or something) UPS literally cook off not even inverting, it was a steel cabinet sitting on a wooden shelf about 8 inches from the back wall. I'm glad I was sitting there, it scorched the shelf and the drywall behind it, nothing caught fire, but a good bit of magic smoke smell to go with the burnt pine and paper on the drywall. Board inside the unit was cooked.

I will be moving my inverters to a block structure, until then they are currently mounted on cement board, with the nearest wood at least 8 inches away from the cabinets. Were they not getting relocated fairly soon, I would likely put cement board on the roof above the inverters as well instead of just drywall. I might say drywall would be better than wood. And I hope there is a fire extinguisher reasonably close by (But not right next to it for crying out loud !)

The battery fuse blocks/shunts/whatever look a little scary to me. We are talking up to what 600A?/ 1000A? behind a small clear plastic cover inline on some nice supple 4/0 cable. I would screw them down somewhere in a mechanically secure fashion.

rhino said:

I'm not sure I follow what you are trying to say about removing battery cables? What is the concern trying to avoid?

Click to expand...

If you have power on and remove the negative cable and somehow the inverter turns on, it will use the ground pin of the VE.Bus port.

HighTechLab said:

If you have power on and remove the negative cable and somehow the inverter turns on, it will use the ground pin of the VE.Bus port.

Click to expand...

Thanks.. I was just making sure there wasn't some strange thing I didn't know about especially if a BMS trips the power off. I have 2 5kVA Quattros and was considering adding two more but was initially put off when Victron stated in manual to basically just get 2 10kVA instead.

rhino said:

Thanks.. I was just making sure there wasn't some strange thing I didn't know about especially if a BMS trips the power off. I have 2 5kVA Quattros and was considering adding two more but was initially put off when Victron stated in manual to basically just get 2 10kVA instead.

Click to expand...

That would be my recommendation. I think 4x 5kva Multiplus-2's however is less expensive than 2x Quattro 10k

Very nice setup, I'm working towards a Victron setup ordered from CC next week. Looks like your chargeverter is attached directly to the battery bank...can it also be hooked to the Lynx distributor?

A good point by ksmithaz1 on your fuse block and I wonder how's the best way to attach it...maybe a square of cement board on top of the case? Seems screwing it to the wall would put it farther from the battery bank than you want.

​

LarryEW said:

Looks like your chargeverter is attached directly to the battery bank...can it also be hooked to the Lynx distributor?

Click to expand...

Yep. I have mine connected to the distributor.