Originally Posted by Akapeterc
John601CT how do I look after them better?
Ensure high amps charging as often as possible, well over .2C, .4C would be better if possible.
Ensure you get back to 100% Full quickly as possible and very regularly, as verified checking endAmps with a known good ammeter, adjusting charge sources not to drop from Absorb V until then.
Generally staying above 50% SoC except occasional emergencies, shallower the better, certainly never dropping below 30% if you can help it, and consider "dead flat" knocking many hundreds of cycles off lifespan.
Those two combined, PSOC abuse plus too deep discharging can lose 80% of lifespan, even murder a bank in a single
season, but in less extreme form are the norm on 90% of cruising boats.
Have you got a quality SoC meter? Relying on low voltage for your usage cutoff is way inaccurate.
Make sure Absorption voltage is set as per mfg spec, as measured at the bank.
All charge sources should be temp compensated.
What are the avg temps where your batts are installed?
Also, don't let them sit isolated too long without topping up. Don't let parasitic loads at the dock
keep them cycling, cheap
starter batt can buffer a power supply if needed.