I just use one 12 volt group 30 Trojan and then run my little EU2000 Honda generator for about 90 minutes a day; 30 minutes in the morning and 60 minutes around dinner time. Wife like to have the 110 volt anyway for hairdrier, microwave, etc. We can go indefinitely this way.
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2021 F350 Lariat 7.3 4X4 w 4.30s, 2018 Wildcat 29RLX
2012 BMW G650GS, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs
The "LOW" (bottom) light will stay on until the battery hits 6 volts. A this point your battery is pretty much shot and will most likely not ever again accept a full charge.
When the "FAIR" light goes out, the battery volatge just dropped below 11.60 - 11.65 volts. This is an almost totally dead battery with less than 20% capacity remaining. Permanent reduction of total capacity has occurred.
When the "GOOD" light JUST goes out, the battery voltage just dropped below 12.10 - 12.15 volts. This means you are at the 50% depleted state where every source that deals with deep cycle batteries say you should recharge in order to avoid PERMANENT battery capacity reduction.
The top light is "CHARGING" it is on REGARDLESS of battery charge condition as long as there is charging voltage (above 12.70 VOLTS) on the buss. Your battery can be disconnected and as long as your converter is working all 4 lights will be on.
Once you go OFF shore power, the battery voltage will drop even with minimal use to the "GOOD" state. When the GOOD light goes out, you must recharge to prevent permanent battery impairment.
Discharging below "GOOD" will result in early battery replacement.
Not that I think I'm smarter than the engineers who designed the battery monitor, but...
I'd be willing to bet that each one of those LEDs has a resistor on one side so it only lights above certain voltages. Shouldn't be too hard to change out for higher value resistors to get a little safer, more accurate reading
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2014 Silverado 2500 6.6L TD and 4X4
2011 Carson Standard Duty Car Hauler
2012 Forest River Stealth SK2112
Not that I think I'm smarter than the engineers who designed the battery monitor, but...
I'd be willing to bet that each one of those LEDs has a resistor on one side so it only lights above certain voltages. Shouldn't be too hard to change out for higher value resistors to get a little safer, more accurate reading
Let me know how that turns out for you.
The circuit board is pretty compact and also works the tank indicators.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
I think that might be the way to go instead...
Linear Mode
