question

victrongsmr avatar image
victrongsmr asked

Inverter/Charger guidance on US 120/240V system

I have specific power requirements and equipment options I need advice on:

Power Sources:

  • Primary source: Split phase 240V service, consisting of L1 (120V), L2 (120V) - N, and PE (Ground).
  • Secondary source: 120V only via L1 (120V), N, PE.
  • 24V Battery System with a maximum continuous discharge rate of 5.2KW.
  • I require 3200 watts of inverting capability.

Equipment Considered:

  • Given the input voltage variations (120V or 240V), I'm considering:
    • MultiPlus-II 2x120V
    • Quattro-II 2x120V
  • Both have internal transfer relays but are limited to 2400W.

Questions:

  • Is there a US version of the Quattro II - 24/5000/120-50? It currently outputs 230V @ 50 Hz, which isn't suitable for US needs.
  • The Quattro-II 2x120V and MultiPlus-II 2x120V models are capped at 24/3000. It appears my only option is the Quattro - 24/5000/120-100/100 120V.
  • Regarding the Quattro - 24/5000/120-100/100 120V:
    1. Can I connect L1 and L2 to the two AC inputs on the Quattro and program it to accept the split-phase power?
    2. If not, what alternative solution would you recommend for my needs?

I considered getting the European version of the Quattro and using an Autotransformer to step down the 240V output into two 120V legs, but since I have no 240V loads, this doesn't seem practical. Additionally, it wouldn't address situations where I only have a 120V power source.

I'd greatly appreciate any advice, especially if the Quattro-II 2x120V or MultiPlus-II 2x120V models were available in 5000VA. Thank you for your assistance.

Multiplus-IIMultiPlus Quattro Inverter Chargersplit phase
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1 Answer
derrick thomas avatar image
derrick thomas answered ·

I'm assuming that since you say you could have different input sources that this is a mobile application? If you have an ATS already installed in the vehicle, or you do not have an onboard generator (or you will be using a portable generator plugged into the shore cord) I would recommend using 2 MP2 2x120 in parallel configuration. This setup will automatically handle the switching from split phase to single phase shore connections. If you have an onboard generator but no ATS is already installed, then 2 quatro 2x120 in parallel. These recommendations are of course based on your statement that you will not have any 240 loads.

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