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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: In Defence of PurePowerPosted by PurePower on: 4/18/2013

PurePower is always happy to answer reasonable questions on this forum. Especially if the inquiries are provided in a spirit of advancing the discussion of the topic. It appears there are an awful lot of misconceptions about PurePower+ models vs the old design that deserve comment.

We will attempt to address all of the issues raised in this forum. It's going to take a few replies to various parts of this string - but I think we can clarify what appears to be a lot of mud - a bit of it slung carelessly.

The PurePower+ 2000 model that hifigeekgirl received was the result of a year of development and had extensive field beta testing. The overheating she refers to occurred on a small sub board that provides charging current to the battery string. It happens that we made a minor change in location of the board when we started full production that moved it out of an area of greater air flow and the heat sink needed to be increased to preserve the cooling level of a power transistor. It did not overheat in our bench tests, and many units in the field never experienced overheating. In hifigeekgirl's case it did overheat. The result was a recurring alarm and descriptive error code raised by the on board diagnostics which was presented on the front display. The PurePower+ automatically protected itself from overheating by shutting down the regeneration and charger. That doesn't seem too stupid to me.

The engineering change required to remedy the problem was very simple and effective. Increasing the heat sink size by 50% reduced the component temperature to well within acceptable operating range and even continuous operation at 100% load did not increase the charging board operating temperature.

We immediately upgraded all units previously shipped to customers and dealers and made the change in production. The issue has not re-occurred and by any measure is fully resolved.

We'll have more to say about reliability and service experience of the PurePower+ models vs the old units.

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