I'd really like to try converting my deep-cycle 12v batteries with alum, but no one offers any real-world, resting-state, amp-hour comparison info. There are plenty of people who have written about their conversions, but, why doesn't anyone ever share any real numbers, like "amp-hours", and "resting-voltage", if those terms even apply anymore with a alum-converted LA battery.
The problem is that most alum LA batter conversions are done for cars, which have a constant charging source, the alternator.
On a boat, wind & solar are not always available, so it's a whole nother story. You have to constantly make sure you don't drop the battery below 50% capacity, or the battery quickly loses it's ability to hold a charge.
Here are my numbers and info. Would it be worth trying to convert to an alum lead-acid battery?
I bought 3 large deep-cycle lead-acid batteries from Sears that probably had sat on the shelf for 5 years & were never maintained. The price was 30% off, but I can only use 10% of the battery's stated amp-hours before dropping below the 50% charged voltage of 12.2 volts at resting-state. That's with a 99% fully charged battery. Basically, I let my wind-generator charge it overnight in 25 MPH winds to the point where the wind-gen is cycling on & off doing trickle-charges, indicating to me that the batteries are fully charged. Then if I wait a few hours with no draw, the batteries initially tested 12.5 volts. Now that 3 months have passed the batteries are reading out 12.3 volts at resting voltage after a full charging, which indicates that the batteries have 60% capacity. (although some say 12.3 volts indicates 50% capacity)
As soon as I put a 100W inverter on the 12-volt batteries, it quickly drops to 12.1 volts in 10 minutes and will hold on to 12.0 volts for another 40 minutes, but if disconnect the draw at that point and let the batteries rest for a few hours, they eventually show a resting-state voltage of 12.25 to 12.3.
I don't know how many amps the inverter & laptop adaptor is truly drawing. For some reason, my multimeters ALWAYS quit being able to measure amps within the first week. I've never been able to figure that one out.
But assuming it's around 100 watts, which is a relatively safe assumption, that's 8.33 amps for about 1 hour which indicates about 8 amp hours per full charge. And this is available from a 27M 105 amp-hour rated Die-Hard deepcycle Sears Lead-Acid battery. So I can use about 7.6% of the 3-month old battery's stated capacity. Normally, with a brand-new battery, one can expect around 45% of the amp-hour capacity before reaching the 50% capacity limit of a 12-volt battery. I read that the battery is not supposed to be drained past 50% w/ normal lead acid batteries.
Does this also apply to LA batteries w/ alum added?
Would I probably be able to use the inverter longer? The inverter is supposed to shut off once it reaches 11.5 volts, so if the alum-LA battery quickly drops it to 11.5 volts it might not be of much use for the inverter, but may be of more value for my anchor light.
Has anyone done any real-world applications with the alum setup and seen any real improvements on the amount of time available to the ham-radio/lights/inverters... or whatever you normally use?
I don't have bandwidth for youtube videos. I'd love to glean info from them, but I can't. I'm limited to text, so, if the good info is in the videos, can someone please roughly describe the improvements I'm likely to see if I dissolve some pickling alum into the acid in my battery & let the solar panel's 17-watt max, or the wind-charger's auto-charging circuit go at it & drain it to 0 volts & repeat for a while?
http://www.cruisersforum.com/forums/...-a-121889.html
There's some more info about Sears' great 30% off discounted deep cycle batteries.
The problem is that most alum LA batter conversions are done for cars, which have a constant charging source, the alternator.
On a boat, wind & solar are not always available, so it's a whole nother story. You have to constantly make sure you don't drop the battery below 50% capacity, or the battery quickly loses it's ability to hold a charge.
Here are my numbers and info. Would it be worth trying to convert to an alum lead-acid battery?
I bought 3 large deep-cycle lead-acid batteries from Sears that probably had sat on the shelf for 5 years & were never maintained. The price was 30% off, but I can only use 10% of the battery's stated amp-hours before dropping below the 50% charged voltage of 12.2 volts at resting-state. That's with a 99% fully charged battery. Basically, I let my wind-generator charge it overnight in 25 MPH winds to the point where the wind-gen is cycling on & off doing trickle-charges, indicating to me that the batteries are fully charged. Then if I wait a few hours with no draw, the batteries initially tested 12.5 volts. Now that 3 months have passed the batteries are reading out 12.3 volts at resting voltage after a full charging, which indicates that the batteries have 60% capacity. (although some say 12.3 volts indicates 50% capacity)
As soon as I put a 100W inverter on the 12-volt batteries, it quickly drops to 12.1 volts in 10 minutes and will hold on to 12.0 volts for another 40 minutes, but if disconnect the draw at that point and let the batteries rest for a few hours, they eventually show a resting-state voltage of 12.25 to 12.3.
I don't know how many amps the inverter & laptop adaptor is truly drawing. For some reason, my multimeters ALWAYS quit being able to measure amps within the first week. I've never been able to figure that one out.
But assuming it's around 100 watts, which is a relatively safe assumption, that's 8.33 amps for about 1 hour which indicates about 8 amp hours per full charge. And this is available from a 27M 105 amp-hour rated Die-Hard deepcycle Sears Lead-Acid battery. So I can use about 7.6% of the 3-month old battery's stated capacity. Normally, with a brand-new battery, one can expect around 45% of the amp-hour capacity before reaching the 50% capacity limit of a 12-volt battery. I read that the battery is not supposed to be drained past 50% w/ normal lead acid batteries.
Does this also apply to LA batteries w/ alum added?
Would I probably be able to use the inverter longer? The inverter is supposed to shut off once it reaches 11.5 volts, so if the alum-LA battery quickly drops it to 11.5 volts it might not be of much use for the inverter, but may be of more value for my anchor light.
Has anyone done any real-world applications with the alum setup and seen any real improvements on the amount of time available to the ham-radio/lights/inverters... or whatever you normally use?
I don't have bandwidth for youtube videos. I'd love to glean info from them, but I can't. I'm limited to text, so, if the good info is in the videos, can someone please roughly describe the improvements I'm likely to see if I dissolve some pickling alum into the acid in my battery & let the solar panel's 17-watt max, or the wind-charger's auto-charging circuit go at it & drain it to 0 volts & repeat for a while?
http://www.cruisersforum.com/forums/...-a-121889.html
There's some more info about Sears' great 30% off discounted deep cycle batteries.
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