More info – this is a good read: http://www.eastpennmanufacturing.com/wp-content/uploads/Guide-to-VRLA-Batteries-1927.pdf
More thoughts on alternators. When you look at a “big” alternator, look at the degraded output while hot, not the cold output. Then look at the output at your cruising and idle RPMs, not the max RPM the alternator is capable of. You may well find out the 120 amp alternator is derated to 90-100 when hot and only doing 80 at your cruise RPM and 40 (or less) at idle. Your big gain may be putting out much more than your stock alternator at lower RPMs, not in the max possible output. You should also hopefully gain a more robust unit. The usual progression we had back in the day was customer bought big batteries and then came back for a 3 stage regulator, then the burned out their stock alternator and came back again for a better alternator to go with the new batteries and new regulator. Any auto-derived alternator was originally designed for smallish batteries with thin plates that charge very fast on startup and taper off quickly, not putting out max output for hours on end. Joe Coquina
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