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remarc avatar image
remarc asked

Victron Autotransformer wiring for US Split phase: 120VAC to 120/240VAC

I am considering installing a MultiPlus in a off-grid setting. The site has a 240V split phase 100m deep well water pump. I see in the VE Autotransformer manual there is a reference (page 3 of appendix) to Split phase: 120VAC to 120/240VAC. My question is how is how do I wire this configuration on the Autotransformer terminal board?

Autotransformer
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Johannes Boonstra (Victron Energy Staff) avatar image
Johannes Boonstra (Victron Energy Staff) answered ·

The Autotransformer is bi-directional as it is basically a single transformer side with a centre tab. So the centre tab is the N side of the 120Vac. The 120vac source is to be connected here and on L1 (or L2) and then on the other side L2/N the 120Vac willappaer

As this second phase is 180out of phase with the source the L1/L2 will produce 240Vac


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remarc avatar image remarc commented ·

Thanks Johannes for the response. Is the below image correct?.

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autotransformer-split-phase-120vac-to-120-240vac.png (137.1 KiB)