The Crown1 G31 AGMI have, is not mine, I am outfitting a foreign couple's van with a capable electrical system.
I've had it since last Thursday. It read 12.99v on delivery, was made in December.
It took maybee 25 minutes of 14.4v before amps tapered below 0.55, and I disconnected it at 0.34a. 36 hours later unloaded, resting, it read 13.01v.
The voltage it has held when testing the 400 watt inverter, at 465 watts of output was in the mid 11's
when fully charged, The voltage drops to 12.56v under a 50 watt load, but bounces back up over 12.9v within a few minutes, after removing hat load some 5 minutes later.
This AGM battery does not list a CCA figure. I assume it would be quite low if it did..
It could be a pretty good deep cycle battery, but I am used to my Northstar group 27, even at 700+ deep cycles and 50 months of age holding considerably higher voltage during loads, and this skews my performance expectations.
As it is basically brand new, I cannot report on cycle life, only that it does not hold voltage as high as my well used and abused Northstar AGM, whose voltage under load I always have found impressive, at cycle number one and cycle 7XX too.
My yardstick is skewed.
The voltage drop under load could be indicative of thicker denser plates, what one hopes for in a good deep cycle battery. They also say not to recharge it at more than 25% of C/20 rating which might make Mex apoplectic. ;)
I have a 45 amp charger for it(PD9245) and it is getting 4AWG from alternator (+) stud and 4AWG back to engine block, so it will be exceeding the max recomended charging current.
The lower than hoped for voltage under load could also be because the battery is new and not broken in yet. My Northstar when spanking new, would not hold a resting voltage over 13 until drained to 50% and recharged at 25 amps initial current.
The Crown1 AGM group 31 was 255$ with tax and core charge, delivered from San Diego Deepcycle battery.
https://www.wholesalesolar.com/cms/four-star-solar-crown-48-vdc-10-560-wh-with-mnbe-d-enclosure-8-battery-bank-agm-battery-maintenance-2936570746.pdfBased on my own current battery needs, which is dual purpose, starting and deep cycling, I will stick with a Northstar or perhaps an Odyssey for their cycleability and high CCA. The advertised Thin plates have to cut into total achieveable deep cycles, but I am happy with the 700+ I have achieved so far, and when I first got this battery My charging sources were not optimized with manual adjustable voltage, like they are now.
I also want a battery in my rig, that does not list a maximum charge rate, and appears better off for rather huge recharge rates.
In that other thread I did not want to give the impression that the Crown1 AGM g31 is no good. I cannot determine that yet based on voltage under load, only that it does not compared favorably with my dual purpose high CCA Northstar AGM that has 20 fewer AH of capacity and would likely have 400 or more CCA(930) compared to the crown1 which does not list a CCA figure.
