Battle Born Charging
This might answer some recent questions. The table is not accurate wrt to the BB comments--don't go by it by the table itself. Wade through the questions and answers to get the true picture. Tak...
Forum Discussion
First you need to figure the equivalent of power so LFP 500ah is 400ah usable. What would be AGM be 600, 700, 800ah?
Now what is the weight difference? My entire system weighs 500#, the 5 batteries weigh 143# or under 30# each. Weight as we all know is a factor, more so as a fulltimer.
During good solar days in spring, summer, fall they are fairly shallow unless there is a stretch of rain/ overcast days, but late fall to late spring they are not shallow with shorter daylight, the DOD can be 40-45% so this is where the LFP start to show their benifits, are your agms powering 80-150a loads for 10 minutes at a SOC of 30-80% before shutting down the system and having to drag the generator out? As I have stated in a year I might use a generator maybe a dozen times for a hold over charge of 2 hours (200ah/ 40%) can agms do this without shortening the life or at the very least you will have to plugin to a shoreline for equalization/ run the generator for a looooong period?
Can you start an evening at 60-80% SOC and not worry about the next day power "wants"?
This is where it becomes questionable as far as cost. My batteries cost $3,550 after the 30% tax credit 4 years ago. If building your own batteries now this can be done probably at 1/2 this price if not more. Dropins are not a good deal financially but the ease of "simplicity" comes at a cost.
This is what I found in a quick search for agm battery, just a rough cost factor but LFP are not 4x the cost.
Lifeline 6v 400ah (119#) are $690 x2 =$1380 (12v 400ah), 12v 800ah (476#) is $2760 +/- .
Weekend warriors probably not worth it unless weight is a factor and money is not.
The way I'm living/ boondocking there is no dought in my opinion LFP are better than agm. Last strech of boondocking without hook ups before having to get some work done on the 5th wheel was 1,072 days, we're on day 122 of this strech of boondocking.
Now what is the weight difference? My entire system weighs 500#, the 5 batteries weigh 143# or under 30# each. Weight as we all know is a factor, more so as a fulltimer.
During good solar days in spring, summer, fall they are fairly shallow unless there is a stretch of rain/ overcast days, but late fall to late spring they are not shallow with shorter daylight, the DOD can be 40-45% so this is where the LFP start to show their benifits, are your agms powering 80-150a loads for 10 minutes at a SOC of 30-80% before shutting down the system and having to drag the generator out? As I have stated in a year I might use a generator maybe a dozen times for a hold over charge of 2 hours (200ah/ 40%) can agms do this without shortening the life or at the very least you will have to plugin to a shoreline for equalization/ run the generator for a looooong period?
Can you start an evening at 60-80% SOC and not worry about the next day power "wants"?
This is where it becomes questionable as far as cost. My batteries cost $3,550 after the 30% tax credit 4 years ago. If building your own batteries now this can be done probably at 1/2 this price if not more. Dropins are not a good deal financially but the ease of "simplicity" comes at a cost.
This is what I found in a quick search for agm battery, just a rough cost factor but LFP are not 4x the cost.
Lifeline 6v 400ah (119#) are $690 x2 =$1380 (12v 400ah), 12v 800ah (476#) is $2760 +/- .
Weekend warriors probably not worth it unless weight is a factor and money is not.
The way I'm living/ boondocking there is no dought in my opinion LFP are better than agm. Last strech of boondocking without hook ups before having to get some work done on the 5th wheel was 1,072 days, we're on day 122 of this strech of boondocking.
