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  1. Dumb Electrical System Question

    Electrical Systems
    A previous owner upgraded the electrical system on my sailboat. It has two - 4D size batteries for the house systems and a single starter battery for the engine. My understanding is that the starter battery is supposed to be isolated and completely dedicated to starting the engine. However...
  2. Hypothetical Radar

    General Discussion (sailing related)
    Time to play hypothetical questions. Let's say I have a boat. What boat isn't important. Let's say it has radar. Let's say there's a race called, say, Swiftsure. Let's say this race usually lasts a long day and two nights. Let's say it can go longer. Now let's say I want to run radar for the...
  3. Question: different size house batteries

    Electrical Systems
    Another battery question. Compac 27. 3 bank 15 amp smart charger (5A per battery). I have 18hp westerbeke, 50amp alternator. Grp 24 starter battery. Here is the rub, I have a Grp 24 and a Grp 27 deep cycle house batteries run in parallel. I read a post that stated it was ok to have...
  4. Swapping batteries...one question.

    Gear & Maintenance
    My batteries in my 2 bank system are well past their prime. I bought 2 replacement deep cell batteries and am going to install them soon. My main question (and there doesn't seem to be much info online) is, what order to remove the terminal cables? I realize you remove the black (-) then the...
  5. 12V ground on the boat

    Electrical Systems
    I am beginning the electrical system refurb on my boat today, starting at the batteries, main switch battery multiplexer, and motor electrics. (Perhaps I will do a write up of what I find a little later as I get into it a bit more.) My question for today concerns the ground leg. First off...
  6. Battery Switch rewired... wont turn OFF

    Electrical Systems
    I replaced all of my 4 gauge cables going from my two deep cycle batteries to the battery power switch (as well as the one going from battery switch to the alternator). The switch has the option to run on battery 1, 2 or both. But I'm fairly certain the way it was hooked up it was running on...
  7. Let's see your electronics! (for science)

    Gear & Maintenance
    I'm a recent liveaboard and I hope to glean as much knowledge from the community as possible in regards to marine electronics. This thread is not bound by any particular boat size or lifestyle, just post your experiences with what you got and how you apply it so the new guys like me can learn a...
  8. battery charging setup

    Electrical Systems
    We have just purchased a 2000 Catalina. The engine charges the house batteries (which are also used to start the engine). The starting battery is only charged when attached to shore power and would only be used in an emergency (house batteries die). My first inclination was to rewire the...
  9. Battery (and solar) for weekender

    Electric/Hybrid
    We have a 26' sailboat that we are using on weekends. The boat is moored in the North East. The outboard is powered by a West Marine 650 Starting battery and the specs mention that it requires 465 MCA. The battery also supplies power for the VHF, depth finder, and lights. I am planning to...
  10. Through Hull for Outboard and Fuel Supply

    SailNet Website Technical Support
    I just purchased a new Honda 9.9 outboard with an electric start for my San Juan 7.7. Can someone recommend a through transom fitting for routing the cables to the battery and for routing the fuel line to my gas tank? Should I have any concerns about routing the electrical cables and the fuel...
  11. Recommendations for Battery Monitor

    Electrical Systems
    I'm looking to monitor a two battery bank system. One bank for the house, and one for starting. I've been looking at the SmartGauge destibuted by Balmar, and another one by Victron. What I like about the SmartGauge is I don't have to calculate the aH my battery bank can currently hold. What...
  12. Will Solar Panel Trickle Charge Battery?

    Electronics
    Just bought my first real boat. Ericson 29. Couldn't afford to be in a regular dock so I settled or a star dock. Which means I don have electric. I've been told that there are permanent solar panels that can be installed on the deck to tricle charge my battery. After some brief research I...
  13. House batteries won't start engine - ideas?

    Gear & Maintenance
    I would love any suggestions about how to tackle this question -- my sailboat has a 3 batteries and a standard off/1/both/2 Perko switch. Battery 1 is used as the starting battery, even though it is a deep cycle (It was on the boat that way when I bought it). Battery 2 is actually 2 deep...
  14. Huge Voltage Drain Problem - Ideas?

    Electrical Systems
    Today I noticed (according to the Xantrex battery monitor) that the batteries were being drained at a rate of -40A. The Xantrex also said the batteries were at 37% of charge, and at -275Ah (for 4 Trojan T125s). Normal high draw rate is -10 to -15A. These are new batteries, installed 2 weeks...
  15. Battery & etc opinions...

    General Discussion (sailing related)
    New to the forum! I've been lurking for a year or so and have read many great posts. Now it is my time to ask the ubiquitous battery question. Understand, I've read a great deal from posts in the past, but wanted to get some fine tuned help. So, the back story: 1982 C-30, no auto-pilot...
  16. Series / Parallel Battery Jumper Sizing

    Electrical Systems
    First time boat owner here. 1982 Irwin Citation 40 MKII with 2 previous owners worth of headaches. To start, I want to go through and ensure all cables are sized correctly and properly fused. I have a basic understanding of how to use voltage drop and ampacity tables, read and re-read Nigel...
  17. Digital voltmeter as a battery monitor

    Cruising & Liveaboard Forum
    Hello everybody, I haven't been on here in months but I am very proud to say that I am living aboard my first little boat! Nothing flash, but it's home and very cheap to live and that means I'll have a proper Yacht soon enough! But onto my question, I have two batteries which I need to keep...
  18. Westerbeke 12B Battery/Starter Wiring Confusion

    Electrical Systems
    Hi Folks, Last fall I purchased a 1991 Pearson 27 and while getting it ready to go in the water this year, I decided to try to understand how the battery system is connected. While going through everything I ran into a bit of an issue that I don't understand and I am hoping someone here could...
  19. Batteries - Replacement

    Gear & Maintenance
    Fellow Sailors! I believe it's time to replace my house batteries and as usually it's difficult to choose. I currently have two GC2 6volts installed in series, however I think it may be an overkill. I say that because I keep the boat on a mooring and use the engine about 10mins each sail...
  20. AGM Mounting positions

    Electrical Systems
    Hi! I've read in many places that one of the advantages of AGM batteries is that they can be mounted in many odd positions that wet cells cannot. In every picture I've seen or account I've heard, however, they are always mounted just as a car battery would be. Has anyone actually mounted one in...
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