Bob142
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This thread got me wondering if there are any testing standards that can be applied to all these batteries in our applications and I found IEC 61427-1:2013.
There's a good description here:
It may not be a perfect indicator of service life, but at least it's a standardized test.
I found the test report for my Trojan AGMs on their site that makes the following assertion (underline is mine):
"Therefore, since the 27-AGM battery delivered about 1,275 IEC cycles before it failed to deliver at least 80% of its rated capacity, we can say that Trojan Battery Company’s AGM battery line has a service life of at about eight and one-half (8½) years, and this is reflected in Table 3. Finally, the results obtained from testing the 27-AGM model apply fully to all other AGM models (current and future) by virtue of similarity of design. "
I've found similar test reports for some Rolls flooded lead acids stating:
"8.4: Cycling endurance test in photovoltaic applications (extreme conditions). Battery completed 4 aggregate phase A+B cycle sequences, after which the discharge at the 10 hour rate delivered temperature-corrected capacity of 223 Ah which is less than 80% of the specification value equal to 229 Ah. PASSED. "
Which based on my understanding of the standard equates to a service life of 4 years.
I haven't found any test reports for Battle Born or other drop-in LFPs (but I just found this standard so haven't spent a lot of time on it).
There's a good description here:
IEC 61427 STANDARD - and its Importance to PV Applications
IEC 61427 recognizes that batteries in PV applications take on the characteristics of both float and cycling applications.
www.canbat.com
It may not be a perfect indicator of service life, but at least it's a standardized test.
I found the test report for my Trojan AGMs on their site that makes the following assertion (underline is mine):
"Therefore, since the 27-AGM battery delivered about 1,275 IEC cycles before it failed to deliver at least 80% of its rated capacity, we can say that Trojan Battery Company’s AGM battery line has a service life of at about eight and one-half (8½) years, and this is reflected in Table 3. Finally, the results obtained from testing the 27-AGM model apply fully to all other AGM models (current and future) by virtue of similarity of design. "
I've found similar test reports for some Rolls flooded lead acids stating:
"8.4: Cycling endurance test in photovoltaic applications (extreme conditions). Battery completed 4 aggregate phase A+B cycle sequences, after which the discharge at the 10 hour rate delivered temperature-corrected capacity of 223 Ah which is less than 80% of the specification value equal to 229 Ah. PASSED. "
Which based on my understanding of the standard equates to a service life of 4 years.
I haven't found any test reports for Battle Born or other drop-in LFPs (but I just found this standard so haven't spent a lot of time on it).