01-07-2019, 11:30 PM
https://www.ebay.com/p/High-Precision-G-.../509814120
Above it a link to the exact brand of wattmeters I am using to measure current to and from the battery. I have modified mine with 8awg leads replacing the 12awg leads they came with. There are dozens of clones of this wattmeter available all over the web. I have experience with a few of them.
I am using both these wattmeters inline while charging the battery, one is 'permanently' attached to the Meanwell power supply DC output, the other is a portable. i use 45 amp anderson powerpoles on 8awg wire to and from the load and source sides.
I set the voltage to 14.66, and connected the anderson powerpoles.
Both wattmeters registered an amp peak of 38.2 amps flowing into the battery, but when i looked it had already tapered to 32 amps. A minute later it was still accepting 25 amps.
2 minutes later it was still accepting 24 amps, and I started getting nervous.
I could detect no Heat building up on th casing or terminals, and hear no noises over the fans of my powersupply which run anytime it is plugged into either AC or DC.
After 8 minutes it was still accepting 22 amps. I really expected it to be less than this.
I wussed out and lowered voltage to 13.7v, and it was still accepting 9 amps when i came back to the computer to type these observations. I wil go back and raise voltage in increments to keep about 8 to 9 amps flowing into the battery until 14.66 is reached at battery terminals
I honestly expected less than 30 amps to instantly reach 14.66v and for amps to taper to the low teens in a few minutes.
The UB12180 states on its casing Not to exceed 5.4 amps of charging current
This Mightlymax AGM of the same exact dimensions and stated capacity, came with no instructions.
Does it have more thinner plates? Does it have a higher specific gravity of the electrolyte? Does it have significantly less resistance than the Ub12180?. Is this why it seemed to retain more voltage under discharge tha ni would expect, and accept way more amps for longer than I expected?
Unless I go back and find the battery melted and bulging emitting sulfur fumes. i am impressed!
If money were No object i would have gotten the Odyssey pc680, as these basically say there is no amperage limit, only voltage, but they want 129$ for one of those, and they are slightly larger for 18Ah and 3.4 Lbs heavier.
Above it a link to the exact brand of wattmeters I am using to measure current to and from the battery. I have modified mine with 8awg leads replacing the 12awg leads they came with. There are dozens of clones of this wattmeter available all over the web. I have experience with a few of them.
I am using both these wattmeters inline while charging the battery, one is 'permanently' attached to the Meanwell power supply DC output, the other is a portable. i use 45 amp anderson powerpoles on 8awg wire to and from the load and source sides.
I set the voltage to 14.66, and connected the anderson powerpoles.
Both wattmeters registered an amp peak of 38.2 amps flowing into the battery, but when i looked it had already tapered to 32 amps. A minute later it was still accepting 25 amps.
2 minutes later it was still accepting 24 amps, and I started getting nervous.
I could detect no Heat building up on th casing or terminals, and hear no noises over the fans of my powersupply which run anytime it is plugged into either AC or DC.
After 8 minutes it was still accepting 22 amps. I really expected it to be less than this.
I wussed out and lowered voltage to 13.7v, and it was still accepting 9 amps when i came back to the computer to type these observations. I wil go back and raise voltage in increments to keep about 8 to 9 amps flowing into the battery until 14.66 is reached at battery terminals
I honestly expected less than 30 amps to instantly reach 14.66v and for amps to taper to the low teens in a few minutes.
The UB12180 states on its casing Not to exceed 5.4 amps of charging current
This Mightlymax AGM of the same exact dimensions and stated capacity, came with no instructions.
Does it have more thinner plates? Does it have a higher specific gravity of the electrolyte? Does it have significantly less resistance than the Ub12180?. Is this why it seemed to retain more voltage under discharge tha ni would expect, and accept way more amps for longer than I expected?
Unless I go back and find the battery melted and bulging emitting sulfur fumes. i am impressed!
If money were No object i would have gotten the Odyssey pc680, as these basically say there is no amperage limit, only voltage, but they want 129$ for one of those, and they are slightly larger for 18Ah and 3.4 Lbs heavier.
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