My Screwy 31
First off let me say I am not stressing over this. It's just a battery, it is only money, it is meeting my overnight needs, but it is displaying strange behavior, and I am curious as to why. So th...
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Just when you thought this thread and battery were dead.
Out comes the whip.
For a week or 10 days I have a friend's ARB chest style fridge and his truck. I will be making a portable power pack mainly for this fridge with a lifeline group 31 AGM as the heart with a PD9245 as the grid powered charging source, but some 2awg cabling will goto the alternator too.
He had the ARB fridge on and already cold when he dropped off the truck, and I took it out and hooked it to the screwy 31, which had self discharged in about a week to 12.53 volts. I've got my watt meter inline on the cord.
The ARB does vary the compressor speed, and thus the amp draw, but I have not seen it go below ~45 watts, and the registered peak wattage is 66. It seems to run less often, but for longer periods than my Vitrifrigo which uses the same Danfoss BD35f compressor.
In 15 hours it has consumed 9.231 AH/ 120.7 watt hours in mid 60's ambients with a 34F setting. The screwy 31 has touched 12.23 volts under the 60 watt load and unloaded at this point rebounds to 12.44v with the compressor not running.
I have found a galvanized lid from an old electrical breaker box which is basically perfect size to cradle the bottom of a new T-1275. Some minor cutting will be required to get it to fit, and ventilation will also require some metal work, but fitting the t-1275 is not high on my to do list at this point. I've got other projects, and my AGM and Meanwell can take up the slack of not having a healthy flooded battery to cycle and whip into submission.
Out comes the whip.
For a week or 10 days I have a friend's ARB chest style fridge and his truck. I will be making a portable power pack mainly for this fridge with a lifeline group 31 AGM as the heart with a PD9245 as the grid powered charging source, but some 2awg cabling will goto the alternator too.
He had the ARB fridge on and already cold when he dropped off the truck, and I took it out and hooked it to the screwy 31, which had self discharged in about a week to 12.53 volts. I've got my watt meter inline on the cord.
The ARB does vary the compressor speed, and thus the amp draw, but I have not seen it go below ~45 watts, and the registered peak wattage is 66. It seems to run less often, but for longer periods than my Vitrifrigo which uses the same Danfoss BD35f compressor.
In 15 hours it has consumed 9.231 AH/ 120.7 watt hours in mid 60's ambients with a 34F setting. The screwy 31 has touched 12.23 volts under the 60 watt load and unloaded at this point rebounds to 12.44v with the compressor not running.
I have found a galvanized lid from an old electrical breaker box which is basically perfect size to cradle the bottom of a new T-1275. Some minor cutting will be required to get it to fit, and ventilation will also require some metal work, but fitting the t-1275 is not high on my to do list at this point. I've got other projects, and my AGM and Meanwell can take up the slack of not having a healthy flooded battery to cycle and whip into submission.
