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Old 04-07-2016, 05:01   #16
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Re: Impossible decision regarding charging

thanks,
the reason I ask is that the biggest drain on batteries is usually the inefficient fridge and freezer concept.
if this was fixed first, it would probably be the equivalent of adding 200 watts of solar and an efficient alternator and management system combined.


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Old 06-07-2016, 13:49   #17
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Re: Impossible decision regarding charging

at anchor you are 100% correct.. my fridge is 95% of my daily consumption.

on a passage however, its autopilot, then radar

assuming he has just one fridge unit (given his size) thats about 50aH for the normal stuff, but a budget of 150aH for offshore would seem to be more reasonable.

never met a stock 50A alternator that could do 50A either.. mine did 30A on a good day...

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Originally Posted by Fuss View Post
thanks,
the reason I ask is that the biggest drain on batteries is usually the inefficient fridge and freezer concept.
if this was fixed first, it would probably be the equivalent of adding 200 watts of solar and an efficient alternator and management system combined.


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Old 09-07-2016, 00:10   #18
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Re: Impossible decision regarding charging

My order of preference would be:

(1) Swap your alternator for one around 80A (because of the single belt) and which has an external field terminal, and run a smart regulator. There are a few where you just set a switch for your battery type. This has the advantage of setting off with a new alternator, and having a spare to boot. If your existing alternator has a field terminal, you can just add the regulator - cheap, easy, and effective (otherwise some soldering is involved, and it's not pretty).

(2) The alt-to-batt works well, and also has a separate feed to isolate the start battery. Easiest solution, as the OP mentions, and not too expensive.

Solar's great, but if you don't have room to keep them out of harm's way, or if the weather sucks, it's nice to still be able to charge. Redundancy rules!
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