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satiagraha avatar image
satiagraha asked

Parallel Autotransformers for Higher Power Neutral Forming

I'm trying to provide ~25kVA of split phase 120/240V 60Hz to a residence with two 15kVA 240V Quattro units. Even with a decent load balance, one 100A Autotransformer can't handle enough power. Can I parallel two of them? Does anyone have a wire diagram for paralleling autotransformers for neutral forming?

Am I better off just using four 10kVA 120V Quattro units (two pairs natively producing split phase) and not having the load balancing of an Autotransformer?

Also, does anyone know what the power losses are of the 100A autotransformer under load and no-load?

MultiPlus Quattro Inverter ChargerAutotransformer
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1 Answer
shaneyake avatar image
shaneyake answered ·

I prefer to run 240V inverters.
Yes, there is no reason why you can't parallel the transformers but honestly I would just install a
25kVA transformer like a1-PHASE 240X480 - 120/240
https://store.maddoxtransformer.com/products/1-phase-240x480-120-240
I haven't used this exact transform but you can contact your local commercial electrical supplier and they will have a list of 25kva transformers.

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