"Transformerless inverters need fuses on both DC positive and DC negative legs to protect the inverter in case of ground fault."
I could be wrong, but my understanding is that TL inverters are no different than transformer type inverters in terms of DC fusing requirements - no fuse required for one or two strings in parallel; fuses required on + and - leads for 3 or more strings in parallel. Mark Byington Cobalt Power Systems, Inc.
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