I finally found a reason to post this chart I spent last week producing.
I just bought a pair of each These batteries are about $100 apiece used as a backup for 5 years or 1/2 the estimated life. They are cycled one a year which is the only use they have seen. The data safe has a date code of 2019.
Data Safe 12HX505-FR (rated 119 A-h 8 Rate to 1.75 VPC (10.5V battery)
Dynasty UPS12-600MR (rated 148 A-h 20 hr Rate 1.75 VPC (10.5V battery)
I measured both as a pair and get :
Data Safe 12HX505-FR 150 A-hr (5.5hr @ 30 amps load to 11.95V)
https://pwrstoragesolutions.com/prod...ry-12hx505-fr/
Dynasty UPS12-600MR 167 A-hr (5.5 hr @ 30 amp load to 11.95V)
https://powerprosinc.com/UPS12-600MR-C-D-Dynasty.html
The plot shows the recorded voltage vs SOC for the two pairs of AGM's with a typical LiFEPO4 characteristic. The analysis is to estimate what happens with the LiFepo4/AGM parallel connection. I indicated the stable switching points.
I will probably use the Data Safe because they have a much lower internal resistance 2.3 mOhm vs the Dynasty which I measured about 8.6 mOhm. much.
. One pair will go in a fixed trailer in the mountains and the other in modified frame battery boxes for the 2000 XLT EB E-350.