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Old 09-12-2012, 10:43 PM   #21
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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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Old 09-13-2012, 07:41 PM   #22
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Originally Posted by herk7769 View Post
On the subject of the battery "idiot" lights.

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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Old 09-13-2012, 08:03 PM   #23
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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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Old 09-13-2012, 11:27 PM   #24
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Let me know how that turns out for you.
The circuit board is pretty compact and also works the tank indicators.
Didn't you pick up an aftermarket battery monitor? I think that might be the way to go instead...
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Old 09-14-2012, 07:18 PM   #25
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Didn't you pick up an aftermarket battery monitor? I think that might be the way to go instead...
Battery Monitor System Ideas

I have the TM-2025-RV battery monitor system.
Love It.
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