AGM Adventures- Update

landyacht318 wrote:
Mex, with BFL13's new 5M ohm resistance AGM 100ah battery, at what amperage would you recommend at 14.7v to terminate charge indicating 100%?

YOur LL GPL-31t and My Northstar-27 are ~3.62 and 2.6 m ohm respectively

http://lifelineb.wpengine.com/wp-content/uploads/2015/12/Technical_Bulletin_GPL_Acid_Volume.pdf

http://buy.northstarbattery.com/p/nsb-agm-27m-battery

Lifeline says 0.5A per 100Ah capacity at 14.4v and 77f.
Northstar says 0.3a per 100Ah capacity at 14.46f and 77f

To add another question to Mex's quiz---

In view of Mex's post that exceeding the specs somewhat sometimes will not wreck the battery-----

Scenario--

Weekend camping with 15a shore power hooked up. Battery is full on a 55 amp fixed voltage converter at 13.7 volts, inverter load if power fails is DC 10 amp draw from battery.

Shore power fails and doesn't get restored for 5 hours. 100AH AGM is now at 50% SOC. EDIT a bit less due to Peukert (10a vs 5a 20hr rate)

Power is back on, inverter is off, and the converter now on cranks out 55 amps at 13.7 volts. Might be a small DC draw under 5 amps remaining (a DC light or two) Say there is 45 minutes before amps drop below the dreaded 27a high current specified limit.

EDIT-- refined set-up but same questions. Camper is whole house on inverter running the electric only fridge and 120v receptacles. Shore power is for only the converter and microwave. With shore power on, the converter cancels the battery draw so batt stays full, but when shore power fails, now the inverter load is limited. Standing order to only use the toaster in the receptacles, not the higher watt kettle etc unless there is shore power.

Questions--

A.How bad is that exactly for the battery?
B. What if that happened for six weekends every year once a weekend?
C. What if you used the 55 amp charger every time you recharged from a low SOC, say 50 times a year?