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Magnum vs Victron inverters


GlennWest

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On 11/25/2019 at 7:08 AM, GlennWest said:

So you are saying, two inverters run to separate legs, L1 & L2, will not give me 230v when using the proper breaker which engiages each leg? Don't see how 110 + 110 doesn't equal 220. Know this has been suggested on multiple times.  

AC means Alternating Current.   This means voltages are varying from + to - 60 times a second (60 Hz).

In order to get 240 volts from one hot leg to the other and 120 volts from each leg to neutral, the two hot legs have to be properly phased with each other.  This means the two sources are running at the exact same frequency so that every time  L1 is at + 120 volts, L2 is at - 120 volts, creating the 240 volt difference between the legs.

This happens automatically when you're connected to a properly wired shore power because the socket is fed from a center tapped transformer.

A pair of inverters need to be synchronized so they are at the exact same frequency and their outputs are phased so that the instant one is at +120 volts the other is at -120 volts.  This means using inverters that can be connected together so their outputs remain properly phase locked to each other.

Or a single inverter that's configured to provide a 120/240 volt output.

If you have a pair of free running inverters, there's nothing to ensure they are phased to each other.  You could get any range of voltages between the two hot legs depending on where each inverter is on the + to - phasing at any instant.

In fact, you can have 0 volts from one leg to the other if both hot legs are in phase with the other.  At the same instant one leg goes to +120 volts, so does the other.  This happens if you feed both legs from the same 120 volt source so there's nothing but a piece of wire between the two legs in the power panel.  There's 0 volts difference between them, but each will measure 120 volts to the neutral. 

Edited by Lou Schneider
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4 hours ago, Lou Schneider said:

A pair of inverters need to be synchronized so they are at the exact same frequency and their outputs are phased so that the instant one is at +120 volts the other is at -120 volts.  This means using inverters that can be connected together so their outputs remain properly phase locked to each other.

EXACTLY what I've told him more then once  ……………. He can EITHER use two 120 Volt Inverters that are correctly phased and synced to achieve 240 (When L1 is + 120, L2 is  - 120)   OR   One true 120/240 Volt Inverter and be done with it. If a SINGLE 120/240 unit is available with sufficient power rating to suit his needs ???? that's a fairly simple operation. 

John T

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