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I was going to use it as a battery charger for my (negative ground) motorcycle, but found that the positive input and positive output are common, and the charging controlling circuit is in the negative return. I could not use it, but it was not going to be used as it was designed. As a solar controller, it is just fine to have "positive ground", as it is designed. I found it to be well constructed, and have a nice conformal coating to protect it from moisture and vibration.
Verified purchase: Yes | Condition: New