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Old 09-07-2009, 03:11 PM   #29
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1993 21' Sovereign
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I ran into an almost exact problem as the original poster this morning. It looks like the battery charge lead and one of the load leads on the converter got reversed. This meant the converter was putting out 14+ volts at however many amps for the entire weekend, cooking the battery, and causing a horrible rotten egg smell throughout the shop. I've spent the morning venting the shop and rewiring the converter correctly.
It would have been a simple thing to cross two wires when assembling.
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Old 09-07-2009, 03:58 PM   #30
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My Iota has the IQ-4 Smart Charger...I can only assume that it has that featurethen
After checking the link, this Smart Charge feature doesn't have an temperature specific sensor attached to the battery. It seems that only the voltage is monitored, not the temp. You might want to contact Iota tech support and check out whether they do use a temperature compensation factor in their smart charging equation.

Many cruising sailboats, especially ones that sail in tropical waters (80+ degrees) use a charger that employs this temp compensation feature. We have also heard of a few exploding batteries on sailboats, brought about by overcharging & excessive heat.

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When I put the VM on the batteryit read 13.94v. As soon as I take the Iota out of the equationthe voltage drops down to 8.62v
Not good! When the charging source is removed from the battery bank, healthy batteries, without a load on, should float down to around 12.7-12.8 volts. I'm looking for a chart that we had that displays battery voltage at rest (i.e. no load, no charge) vs. battery condition/life.

If you poke around Ample Power's website Ample Power Primer they have a lot of information regarding battery charging in this primer, including testing batteries, charging basics, etc. We know the people behind this company & they have experience, besides in electrical engineering, in living on 12 V, both on sailboats & RV's.
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