Inverters Stacked

[davidbrady]

If they're stacked then the output is 240VAC. Our Vantare's have no 240V loads so we'd still have to split our loads evenly to each of the two 120VAC legs. This will create unbalanced loads which put a heavy strain on the inverters' transformers. To balance the 120VAC legs across the 240VAC stacked source we need a big center tapped transformer. Trace made one for this purpose. It's the T240 Autotransformer (which can step-up, step-down, or balance the two legs), but this transformer is only rated at 3.9KVA, so we're not gaining any additional current over our unstacked 120VAC legs. The big advantage for us in stacking would be battery charging. Stacking designates one inverter a master and the other a slave. This ensures lock-step bulk, absorption, float transitions, but we'd have to install a large capacity balancing transformer or ensure that our loads are always balanced, which in our application isn't possible.