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Old 03-31-2013, 12:05 AM   #1
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Controller & Monitor Settings for Solar

Well, after much research, I pieced together solar for my trailer. I'm using the following: 150w panel, Morningstar tristar 45 controller (I plan to add more panels), and a Trimetric 2025 monitor. I'm still using the 2 Exide Stowaway batteries that came with the trailer, for a total of 150 aH of capacity. I can't figure out 2 settings, both voltage settings for the batteries. First, the Trimetric P1 setpoint voltage. I have it set at 14.3 volts but can't find anything from Exide to confirm this is correct. Second, the Tristar PWM absorption voltage, which I currently have set at 14.4 volts. Can anyone please provide any guidance for these two settings? Any help would be appreciated...
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Old 03-31-2013, 07:14 AM   #2
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what is p1, float? if so, 14.3 is high. should be something closer to 13.7.
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Old 03-31-2013, 08:21 AM   #3
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This is how Bogart defines P1 in the installation manual:

Determine the “absorption charging voltage” to which your charger or charge controller limits the charging voltage. The “charged setpoint voltage” for the TM- 2025 should be set 1% to 2% below this “absorption charging voltage”. For a 12 volt system can be taken as 0.1-
0.2 volts less than the “absorption charging voltage” setting. For a 24V system 0.2-.4 volts less.
If you don’t know what this means: Then start with the following: If you have liquid electrolyte batteries (those with watering caps on top) use 14.3 volts for 12 volt systems, or 28.6 volts for 24 volt systems.
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Old 03-31-2013, 08:56 AM   #4
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Check here for how to calculate the settings:

Battery monitor

P1 - is set 1-2 % below the WFCO (if you have that) Absorbtion Voltage of 13.6 Volts DC ( so 13.4 is perfect)


P3 - is your total AH available (I have 2 - 75 AH batteries so 150 is correct for me

P2 - is the charged set point amps. Take your total AH available (in my case 150 AH) and multiply by 2 and divide by 100. so 150x2/100 is 3.0
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Old 03-31-2013, 09:07 AM   #5
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Thanks! Should I also reduce the voltage setting on the controller?
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Old 03-31-2013, 12:46 PM   #6
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your absorption voltage sounds about right. Lower voltage = more time at absorption.

Trojan battery notes: 14.1 - 14.7 absorption, 13.2 float, 15.5 equalize, 14.8 daily charge.
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