jd10
New Member
Posts: 5 
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Post by jd10 on Feb 2, 2016 8:35:46 GMT -8
My Renogy MPPT 20A charge controller appears to be float charing my battery (Trojan SCS225) at 13.8v. But the spec for my battery state to float charge at 13.2. I'm assuming I can't set the float charge voltage, so then my question is how will this .6v difference impact the battery function/life? As a follow up, will setting the temperature compensation on my MT-5 meter change the voltage? It's currently set to 3.
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Post by Admin on Feb 2, 2016 13:16:23 GMT -8
Hello,
Yes unfortunately you are not able to change the charging parameters on our 20A MPPT. I believe the 0.6v difference will affect the lifespan of the batteries but I would recommend contacting Trojan to verify. Yes changing the battery compensation will increase/decrease the charging voltages depending on the ambient temperature.
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jd10
New Member
Posts: 5
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Post by jd10 on Feb 2, 2016 19:43:52 GMT -8
Could I get specifics on how to decrease the voltage using the compensation setting on the MT-5 meter? It appears I can set it between 0 and 10. Would raising that number increase or decrease the voltage? As I understand it, the amount the voltage is increased or decreased depends on the ambient temp, but I'm just wondering which direction to go with the setting if I'm trying to lower the voltage for the float stage.
Thanks.
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Post by Admin on Feb 3, 2016 17:02:00 GMT -8
Hello, What is the ambient temperature where the charge controller is located? Here is a link to a chart that will show how temperature decreases/increases the float voltage depending on the temperature compensation. www.vmaxtanks.com/assets/images/technical%20info%20folder/float_charge_chart.pdfThe temperature compensation of these batteries is set to –5mV/°C/cell and the battery recommends a float charge of 13.5-13.8 volts @ 70°F/20°C. |
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