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Compass Marine How To | all galleries >> Welcome To >> Alternators & Voltage Sensing - Why It's Important > Voltage Sensing At Battery Terminals - 1 Hour Charge
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Voltage Sensing At Battery Terminals - 1 Hour Charge

Do you think it looks a little different with good voltage sensing..?

*In 1 hour the charge source delivered 49.37 Ah's to the battery. This is an improvement of 7.44 Ah's in just a short 1 hour charge cycle. This equates to a percentage increase in charge performance of approx 17.7%, just by moving two small wires.

*Bulk charge at 50A increased by 20 minutes to a full 50 minutes of bulk charging. Remember this was a 100Ah battery charged at 50A for just 1 hour.

*The battery actually attained the absorption voltage set point of 14.7V. This is healthier for the battery than stopping at 14.3V. It can help limit some of the effects of sulfation, even in a short 1 hour recharge..

*In the previous test, with no voltage sensing, that battery would suffer performance issues considerably faster due to never even attaining the 14.7V target with daily 1 hour recharges.

Note: Every system and battery bank will perform differently and these graphs may not be representative of the system on your boat. As batteries age the charge acceptance ability diminishes and they will attain absorption voltage faster & easier and will thus begin limiting current sooner in the SOC range.. Getting a good long absorption cycle, with the correct terminal voltage, is but one piece of the battery charging puzzle and good voltage sensing circuit can help with this.

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Max 27-Mar-2016 00:39
Thanks for the detailed analysis and write ups. In my new alternator and regulator install I have changed the wiring to take into account your suggestion on the regulator ground wire also going direct to the batteries as well as the positive sense wire. I have a Balmar 612-Dual driving two 120A Bosch alternators charging a Dyno 6V flooded battery 940 Amp-Hour 12V house bank. Belt setting 3 to take it easy on the alternators. The start battery has a separate stock alternator. The battery voltage is now correct of course during charging but the voltage on the rest of the circuits is approx 15.1V when 150 amps are going into the house bank. My suspicion is corrosion somewhere in the circuit. I have redone the ground bus but obviously more work to do to find the source of the voltage drop (it affects the solar, battery charger and wind gen charging as well but those sources are at a lower amps therefore lower volt drop). In the meantime, am I going to damage components running at this higher voltage - pumps, electronics, LED's etc. ?

Thanks again for your amazing website.


SV Fluenta