Quote:
Originally Posted by thinkxingu
I'm open to that idea, but I need to see if there's enough space.
If I go that route, how does the deep cell recharge (the cranking one would be charged regularly by the alternator)?
Suggestions on a switch to use?
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If you want a foolproof option, buy and install an automatic charging relay when you add the second battery. I have a Blue Seas ACR on my boat and it's a high quality piece of gear. Blue Seas makes a great "Add a Battery" kit that would by ideal for your needs, IMO. See:
https://www.westmarine.com/buy/blue-...caAhwLEALw_wcB
That kit has the switch and ACR in one package and will make installation a breeze.
If you need custom cables made for the installation,
www.bestboatwire.com does great work for a great price and they sell real (UL1426) boat wire. See:
https://www.bestboatwire.com/product...de-by-the-foot
The ACR will always prioritize the starting battery for charging. Once the starting battery is re-charged, it will combine the starting battery and the extra battery to allow the extra battery to be charged. It will automatically uncombine the batteries when charging is not occuring. The switch will give you the option to combine the batteries manually if you need to for emergency starting. Using this setup correctly will prevent having two dead batteries.