Bruce, Your proposal should work but, here are a few things to consider. Lead acid batteries should normally not be charged at a rate greater than 20% of capacity. Group 31 batteries usually have about 100Ah of capacity so lets assume that your house bank is 200Ah and 20% is 40 Amps. Your start bank would be 20 Amps. Now if you were to go cruising and drained your house bank to the recommended max discharge of 50% or 100Ah then when you pulled in to the marina you would be limited to the charge rate of whatever charger you had. A 20amp charger would take ~5 hours. There are some inefficiencies at the top end so lets add 2 hours for a total of 7.
Imagine if that was a 10amp charger. You be waiting 10 hours +2 for a total of 12 hours. Your 12 amp charger isn't going to be much faster. If this is all fine for you then you'll likely be happy with the setup. You should also consider the loads which you'll be running while charging. If you stay aboard for a night then you'll be using the entertainment, lights, fridge, water, etc. The loads add up and take away from that which is going to charge the batteries. I have been satisfied with my ProMariner P-Nautic 1260. It charges my 400Ah bank on one of three channels and my 200Ah bank on another. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mar 31, 2017 4:42 PM, "Bruce Whitmore via CnC-List" < cnc-list@cnc-list.com> wrote: Hello all, Our 1994 C&C 37/40+ has 2 battery chargers. There is also a ProMariner ProSport 12, Gen 3 which is currently hooked up to the house bank, comprised of 2 Series 31 lead acid batteries. It was originally hooked up to one gel cell and one lead acid (I know, *wrong*) and was set to the gel cell setting. Now that I have reverted back to solely lead acid, I have changed it back to charge on the lead acid setting. One 50 amp model, which is clearly original equipment, and hums when it is on. Not my favorite noise, but maybe that's just me. In the pile of stuff left behind by the P.O. is a Guest Charge Pro 2611A, 10 amp charger (5/5). It seems to work. Considering the solid-state and quite nature of these, If I connect the starting battery (also a Series 31) to the 10 amp charger, and leave the ProSport 12 connected to the house bank, 1). Would this provide sufficient charging power? 2). Is there a reason to keep the old 50 amp unit? That one, in addition to humming, takes up a lot of space which I could use for additional storage. Thanks! Bruce Whitmore (847) 404-5092 (mobile) bwhitm...@sbcglobal.net _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
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