Neil, I went down this rabbit hole awhile back. There’s some useful info on the marinehowto site, a couple of alternator-specific articles and a section in the article below covering “do I really need a high performance alternator”. Rod, who runs the site is knowledgeable and thorough. https://marinehowto.com/automotive-alternators-vs-deep-cycle-batteries/ Now the opinion part: For my use-case, with a 2gm20 yanmar, the balmar alternator/smart reg didn’t really hit the mark. As pointed out by joe, these setups are not cheap vs a stock-type unit. My takeaway was that with sufficient engine power, a larger house bank supporting heavy electricity use, (likely involving air conditioning or 120v ac appliances and an inverter) and a situation where charging was more critical (like long distance cruising) these big alternators/smart regulators come into their own. Dave – 33-2 Sent from Mail for Windows From: Joe Della Barba via CnC-List Note you will need one of these to fit a Balmar, 10si clone, or other alternator that isn’t a stock Motorola onto an A4: https://moyermarine.com/product/alternator-support-arm-late-model-ovel_03_222/ Balmar does make alternators that fit, but be prepared to spend $$$$$ if you buy one new. Moyer sells a couple of them too. What kind of batteries are you charging? Joe Della Barba Coquina C&C 35 MK I Kent Island MD USA From: Neil Gallagher via CnC-List <[email protected]> Joe, On 9/14/2021 6:48 PM, Della Barba, Joe via CnC-List wrote:
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