20kVA 120/240V Industrial Off-Grid Power System

SKU: Unassigned

Our 20kVA 120/240V Industrial Off-Grid Power System is the perfect solution for those who want to live off the grid without sacrificing any of the comforts of home. With its powerful pair of Victron Quattro 10k Inverter/Chargers, you can run all of your essential appliances and equipment, even large items like well pumps and welders. And with its 40kW of surge capacity, you can even power your home during peak demand periods. Plus, our modular system makes it easy to expand your system as your needs grow. So if you’re ready to break free from the grid, our 20kVA 120/240V Industrial Off-Grid Power System is the perfect solution for you. 


  • 20,000VA Continuous output @ 25°C
  • 40,000VA Peak output
  • Preconfigured for 120/240V Split Phase Output
  • Built in generator transfer switch
  • 48V DC Battery Input, works with any 48V battery system
  • PowerAssist – Prevent overloads and increase output when using limited generator input
  • Industry leading ultra efficient transformer based design, 96% efficient.
  • Comes with Current Connected’s US based customer service and 10-year extended warranty
  • Customize this kit here

Too much system for your needs? Check out our 10kVA Residential Power System!




The 20kVA 120/240V Industrial Off-Grid Power System

Our 20kVA 120/240V Residential Off-Grid Power System is the ideal solution for those who want to live off the grid without sacrificing any of the comforts of home. With its powerful Victron Quattro 10k Inverter/Chargers, you can run all of your essential appliances and equipment, even large items like well pumps and welders. And with its 40kW of surge capacity, you can even power your home during peak demand periods. Additionally, our modular system makes it simple to expand your system as your needs grow!

What You Get:

Finish Your Setup

If you’re looking to be fully self-sufficient and independent, we recommend a few final touches to make this system truly complete!

Recommended Accessories:

Additional information

Weight 230 lbs

Massive 20kVA Off-Grid Power System for Ambition Strikes

2 reviews for 20kVA 120/240V Industrial Off-Grid Power System

  1. [email protected] (verified owner)

    I just completed installation and start-up of the 20K 120/240 Kit system, three 25K S0K battery racks, and forty-two 400W Rich Solar panels. A well-designed system and knowledgeable staff made the installation and start-up a breeze.

    The well thought out complete package was beyond expectation, in every detail. Oversized cables hydraulically crimped with heat shrink and protective covers. No missing parts! The equipment was everything as described, top quality, very knowledgeable staff. I cannot say enough good things about the product and service.

    The equipment was package and shipped on time, in very heavy-duty crates, on pallets organized in a way that made the installation simple and straight forward. Everything worked the first time.

    I am now producing more electricity than I need! I am using all the equipment, A/C, refrigerators, freezers, and well pump, with plenty of power to recharge the battery bank every day. Worth every penny. I am now energy independent. I now use the public utility as my back-up source. Doubt I’ll ever need them.

    I have been in business for over 40 years, have dealt with hundreds of suppliers, and I can say I have never had a better experience. 100 star rating!

  2. James Anderson (verified owner)

    I bought a $60,000 Victron/SOK system from you in May 2023.

    2x Victron 10k Quattro Inverters in split phase
    2x Victron MPPT charge controllers 450v/200a
    Victron Power In, Distributor, Shunt
    Victron Cerbo GX with 7″ display
    15 (3 racks) of SOK 48v LiFePO4 batteries
    56 Aionrise 330w panels
    Numerous cables, PV disconnects, fuses, accessories, etc.
    1000 ft of PV cable

    Initial shipment was pretty good. I was missing one set of 9″ battery connect cables, Mega fuses, and I received two spools of black wire instead of red and black as we had discussed.
    When I contacted you about the missing items, you corrected everything immediately. Customer service was excellent and top notch.

    I had five month or so delay until I was ready to install the system.
    I asked for a one line diagram of my system to assist with installation, but you said you don’t sent out one line diagrams for liability reasons.
    I thought this was odd, but ok.
    I thoroughly read all of the documentation included with the Victron components.
    The $25,000 worth of SOK batteries did not include any documentation, other than an inspection/certification sheet.

    I quickly realized that the Victron components are modular, and can be used in multiple ways in many different types of systems (off grid, grid tie in, whole house back up, marine, industrial, mobile- van life, etc).
    Their instructions were component specific, and did not account for an overall system functionality.

    I saw that YouTubers Ambition Strikes installed a similar system to mine. I contacted them and asked if they had a one line diagram of their system that might be of help to me.
    They contacted you instead, and you ended up sending me a very simplified one line diagram for a different system, but close enough to mine to be helpful. The one line diagram did not include communication cables.

    As a first time installer, I was really looking for some accurate documentation.
    You offered to walk me through the communication cable installation once I had my main system configured.
    The Victron units all came with various cables, and there were also many blue ethernet cables provided separately.
    This was all very confusing, even with multiple phone calls, including being told that none of the Victron cables were to be used, which is not the case (Cerbo GX).
    Now that I’ve done it once, I could do it again easily without assistance.
    But doing it the first time was a handful, and created some anxiety due to the lack of documentation and instructions.

    The PV disconnects are not labeled with polarity. I had to take one apart to see that the red wire from the top input crosses over to the other side, and the black top input also crosses over to the opposite side.
    There was no wiring diagram included with the PV disconnect, which would have made everything much easier.
    I followed the colors, which resulted in connecting PV input to the charge controllers with the wrong polarity, which obviously did not work.
    I had to take it all apart again and do continuity checks through the switch with a multimeter to see how it worked. Positive PV input comes in to a red wire and exits the switch via a black wire on the opposite side. Negative input comes into the switch black, and leaves via red wire on the opposite side of the switch. This made me crazy for a bit. When I called, the tech on the phone did not know how the switches worked, and could not access a wiring diagram. I was able to figure it out myself with a multimeter, but now I have a red wire going to my negative input on my charge controller, and black going to my positive. I’ll make new cables when I get more MC4 connectors and make it right. But why don’t the PV disconnects have any polarity markings or lables?

    The SOK batteries have a menu system, and there are start up procedures that are important, otherwise battery damage can result.
    In addition, the battery bank has DIP switches that must be set for proper communication. And there are torque specs for the battery lugs.
    None of this information is provided with the batteries. No documentation at all came with the batteries.
    I did, however, find information on your website including a chart for the DIP switches.
    I found out that there is an app to monitor the batteries by PC. But it requires a specialty cable, which is not included with the system.
    If someone (me) buys $25,000 worth of batteries, throw in the cable, or at least tell me about this option and give me the opportunity to order the cable when I purchase the batteries. But at that dollar figure, I’d just throw one in if I were you.

    When I finally had it all together, system startup was difficult.
    There are charge controllers, inverters, batteries, the Cerbo GX, PV disconnects, etc, etc.
    There were no overall instructions on how to start up or commission the system.
    Again, after doing this once, I could do it a thousand times without any help. But the first time requires some accurate information and documention, which was not provided.
    I ended up having issues with the inverter capacitors charging, causing the SOK batteries to go into alarm, and I had several SOK battery breakers tripping.
    I don’t like having safety trips and shutdowns on expensive, undocumented equipment!!
    I read the procedure on your website about how to start up the batteries and didn’t have any luck following the procedure.
    I was informed I needed to have a pre-charge resistor to follow the manual pre-charge procedure to prevent damage to the batteries.
    I was in rural Texas. I spent two hours on the phone calling every store in every town near us. Not a single store carried basic electronic components like resistors. I even called HVAC service companies to see if they had any, nope.
    As it turns out, the 10watt 10 ohm resistors are less than a dollar.

    PLEASE – since you know these systems sometimes require a manual pre-charge, do these things:
    1 – inform your customers up front. Include documentation with the system. I had to figure all of this out by perusing information in various links on your website, and through countless phone calls to your office. Just include documentation with the system and prevent 90% of the headaches.

    2 – Include a 60 cent pre-charge resistor with a $60,000 system. You know it might be necessary. I spent hours trying to come up with a resistor and was unable to. I had to wait until the next day when I had some PV input to pre-charge the inverter capacitors, and then my batteries came on line without alarms or tripped breakers.

    3 – When I added another string to my system a month later, I had to shut everything down. Upon start up, my 15 batteries all went into alarm again, and some breakers tripped as well. But by this time, I had acquired my own pre charge resistors (about $6 for ten of them on Amazon).
    I followed the pre-charge procedure in your online SOK manual and it didn’t work. I tried a different resistor (they came in a pack of ten), still didn’t work. I tried two resistors in series. Didn’t work. I again had to wait until the next day when I had PV input to get the batteries to come online without alarms or tripped breakers.

    Through all of this, your tech customer service was helpful. Being able to call in and ask questions and get guidance in real time was the difference between me getting my system up and running vs. not.
    I give you guys a big shout out for your willingness to be on the phone and to provide help.

    You can avoid most of that by just providing documentation with the system.
    And when I say documentation, I mean assembly instructions, configuration instructions, start up process including what to turn on first, what to turn on second, etc. Include the stinking 60 cent resistor since you know they will be needed sometimes (even though I cannot get the manual pre-charge procedure to work, following it step by step while watching your video about doing it).

    Include an accurate one line diagram with a $60,000 system.
    Is that too much to ask when spending that much money?
    Include communication connections instead of leaving them out because you think it is simple.
    Yes, after doing it, it is not difficult.
    Before doing it once, it is extremely confusing, especially since Victron includes cables that end up not being used.

    Will I buy from Current Connected again? Absolutely.
    Will I recommend people go to you? Yes, and I have.
    But please make the effort to include some documentation, one lines, and instructions with these very expensive systems.
    I lost 10 years off my life in stress and anxiety trying to put this system together and commission it, getting alarms and tripped breakers.
    Not knowing what components to turn on when, or in what order…
    All of that could have been avoided with some simple instructions, and saved both me and your technicians hours of time spent on the phone.

    Still a five star experience, though. I’ll be back.

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I would like to add a generator like the 20kW cummins RS20ACE which puts out 240 split phase. How would I connect the generator so that each Multiplus gets 120V, and each can pass through the full power from generator and charge? Is it possible, or would the waveforms be opposite coming out of the generator?



The 4-wire feed from the generator would first go to a junction box. L1, N & GND would go to inverter #1, L1, N & GND would go to inverter #2. On the output, each inverter would feed to an electrical panel where inverter 1 feeds the L1 bus, inverter 2 feeds the L2 bus, and both inverters have a connection to the neutral and ground bus.


The data sheet on your website for the Quattro says the AC input voltage is 90-140VAC but the Victron manual says the AC input is 187-265VAC?



The inverters used in this kit are 90-140VAC. Each inverter outputs 120v and they are in series for 120/240v split phase. You can feed the set of two inverters 180-280v measured from phase to phase, however, keep in mind that the inverters are passing this through to your loads which may not have as forgiving of a voltage range.