You will have an interesting project
for sure. There was a recent thread, very recent, concerning whether to put batteries local near a windlass/thruster, with some wildly divergent opinions. You should certainly look in to that. One issue is what voltage your house is and what voltage the thruster will be, how far from the house bank, how to charge separate batteries, etc. You'll have to make a decision on that but you can do everything else in the meantime. Just plan for sufficient room for you house bank, plus room for any extra (if needed) for your thruster. If it were only a windlass
I would suggest using the house bank with large cables
going forward to the windlass. Thrusters are a significant issue in that regard though, and for either it depends on how far away your bow is from your house bank. If the house bank is closer to the bow that will influence your decision.
If you go with a separate battery(ies) for the bow, go with a start or combined start/deep cycle battery. There have been some contrary opinions but they should have been sufficiently discredited but you'll have to make up your own mind. If it were my boat, I would strongly think about using an AGM
battery in the bow with a echo charger
to keep it topped off. They are fairly expensive for the capacity but the Optima spirals are excellent for this application. You can put AGMs in any position and they do not need regular maintenance
like wet cells do. I used them for my start batteries on the last two boats and they are great for bow applications.
But lots of ways to skin a cat. Whatever you do, make sure you take advantage of current
thinking on battery switching and charging
. All your main charging
sources should go to your house banks. If you have two alternators on your motor
, the smaller can go to the engine
start battery, or an echo charger
or an ACR can charge the start battery without a separate alternator
(most common solution).
You'll have lots of more detailed questions as you get in to the planning. Have fun and set some money
aside. I'm doing the same thing on my boat right now and I did it to my previous - complete new systems - expensive and time consuming, but well worth it.