XW4024 - problem with parallel work

Hello from Ukraine :)
Could you please help to solve following issue with Xantrex / Schneider Electric XW 4024 Invertors? In our country people don't have a lot of experience in that equipment.

Our Customer bought invertor Xantrex XW 4024 (230 V, 50 Hz) about year ago. Right now he bought other XW 4024 to make them work in parallel.

When we switch both invertors to the “invertor mode”, even without any load on them, one of them seems to treating other one as a load: it shows 0,6 kWt load, and it seems that this power goes directly to AC Load L point of the other XW4024.
When one of them in off - everything is fine – consumption is about 0,03 kWt.

1. We connected all wires according to instruction – Xanbus cables, AC Sync cables (pages 2-7, 2-33,34 of the “Installation Guide”). Dev numbers of both invertors where changed, one device was set up as “1Ph Master”, other “1Ph Slave”.
Both invertors are holding same loads, so AC Load L of master inverter were connected to AC Load L of slave, similar was made for AC Load N.

2. We rechecked AC Sync and XanBus cables – and changed them several times, so we are sure problem is not in cable.

3. Invertors are quite old one was manufactured 17 OCT 2008, other 17 NOV 2009.

What could be source of the problem? Thank you

Comments

  • vitalonevitalone Registered Users Posts: 2
    Re: XW4024 - problem with parallel work

    We talked to Xantrex support guys - it seems that problem solution was in slightly different output voltage of inverters: 227,6 volts for one and 231,8 for another.
    They suggested to turn on search mode on slave inverter, and it fix the problem. When there are load under 3 kWt - slave inverter is in standby mode. Whet load is more than 3 kWt - inverters only feed that load and 0,5-0,6 kWt of power are not wasted any more
  • BB.BB. Super Moderators, Administrators Posts: 28,990 admin
    Re: XW4024 - problem with parallel work

    Sounds like you have a nice solution... I don't have any off grid power equipment--But your solution sounds familiar from something I may have read a few years ago with circulating power between a pair of XW inverters (but I am not sure I remember any solution at that time)...

    And welcome to the forum. Sorry we did not have anybody that knew the answer.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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