Welcome to Carver Yachts Owners Forum

We are a boating forum for owners of Carver Yachts to enthusiastically discuss all aspects of Carver Boat ownership. Whether you are looking for your first Carver or currently own one, you are sure to feel at home on CarverYachtOwners.com

You are currently viewing our board as a guest which gives you limited access to view most discussions, articles and access our other FREE features. By joining our free community you will have access to searching the forum topics, post topics, communicate privately with other members (PM), respond to polls, upload your own photos and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

battery management switch

Discussion of batteries, chargers, wiring, generators, distribution panels, battery switches, etc.

Topic author Canada
SkyeToo
CYO Supporter
CYO Supporter
Posts: 10
Joined: November 7th, 2017, 2:43 pm
Vessel Info: 1989 36' aft cabin, galley down
full upper and aft deck canvas
Location: Ontario Canada
Has thanked: 3 times

battery management switch

Postby SkyeToo » December 29th, 2018, 12:38 pm

1989 Carver 3607
in aft cabin closet is the 1,2,ALL battery management switch.
tested engine start in all 3 positions and yup, engine started - this is wrong!
gennie works fine, all power, lights, etc. 12v and 120 work fine
all batteries charge perfectly underway
battery charger is relatively new and works great, all LED's show correct voltage levels

BUT house batteries (brand new) drain much too quickly (4-5 hours)
woken up at 3am to the warning screech too many times.

my guess is that the battery switch is either bad or incorrectly wired for some odd reason
the starter and house batteries should be isolated by that switch, right?
engines should NOT start in the "2" (house) position, right?

spring plan is to replace the switch and trace the connections to the battery group and charger

BUT I don't have the electrical schematics for that model. Could someone send me link to the PDF's or some such?

Bruce
PS - love this boat- 7th season coming up. handles nasty weather on Georgian Bay no problem.

User avatar

Canada
Midnightsun
Admiral
Admiral
Posts: 920
Joined: March 27th, 2016, 2:27 pm
Vessel Info: The Midnight Sun
2007 41CMY
Volvo D6-370's
Location: Montreal, Canada
Has thanked: 79 times
Been thanked: 313 times

Re: battery management switch

Postby Midnightsun » December 29th, 2018, 2:51 pm

Your setup is fine. The battery switch allocates which battery will be used by the house loads and also which will start the engine/s. A standard setup will require you to switch to house bank when at anchor and starting battery to start and run. This avoids draining the start battery when t anchor and makes sure you do not have no start situation. You need to tell us what you have for batteries. Sounds like you only have a single house bank which is not much.
Cheers, Hans
2007 Carver 41 CMY
Twin Volvo D6-370's
Montreal, Canada
Midnight Sun I Photos
User avatar

Canada
bud37
Admiral
Admiral
Posts: 2111
Joined: April 23rd, 2015, 10:22 pm
Vessel Info: 2001 350 Mariner
Has thanked: 271 times
Been thanked: 448 times

Re: battery management switch

Postby bud37 » December 29th, 2018, 4:20 pm

I agree with Hans.....some more info...engines will start in any position ( normal).....its on you to keep what you decide as a house bank, a house bank......so, what batteries do you have on #1, what on #2 and which one is the house bank. That info would help to diagnose, as there are loads hard wired from the factory to position #1 and others to #2. For example a simple stereo with memory function that is on but not playing can draw a fair bit of power etc.
"There is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”
― Kenneth Grahame, The Wind in the Willows

Safe travels with light winds and calm seas.....

Cool Time ...out.

Canada
Viper
CYO Supporter
CYO Supporter
Posts: 2740
Joined: July 10th, 2015, 9:58 pm
Vessel Info: 1989 Carver 3807
Location: Ontario, Canada
Has thanked: 133 times
Been thanked: 591 times

Re: battery management switch

Postby Viper » December 29th, 2018, 7:18 pm

The guys are correct; the switch simply directs which source (battery banks) you want a load (engines, house loads, etc) to draw from. As Bud mentioned, we need to know the specifics of your current setup; what each bank consists of in terms of number of batteries each, their specs, and the brand. Also need to know what loads are running when you say you only get 4-5 hours capacity. Typically a fridge is the highest draw as it'll run often at anchor if you open it a lot, especially if it's an older fridge. If it's the original fridge, it draws much more than the newer designs. For what it's worth, stereo memory alone doesn't have that much of an impact. While it's a part of the overall usage calculation, the draw to maintain stereo memory is minimal and isn't something I'd worry about in this particular case.

When you say the bank only lasts 4-5 hours and you get woken up at 3am, are you saying that you get to your anchorage at 10-11pm and that's when you start tracking how long the bank lasts or are you getting to the anchorage in the morning and running the genny periodically throughout the day to charge the batteries?

Have you checked to ensure all battery connections are in good shape, clean and tight, and that all the wiring is hooked up as it should be? Have you taken proper readings at the batteries to ensure they are fully charging? What brand and model charger do you have? What voltage do you get at each bank while underway?

It would be helpful to know about any additional hardware hooked up to the batteries that was not factory. For example; where is the "screech" coming from? Is there a low voltage warning device of some sort or perhaps an inverter?
User avatar

United States of America
g36
Admiral
Admiral
Posts: 572
Joined: April 7th, 2014, 6:07 pm
Vessel Info: 1997 Carver 405
Location: Soddy Daisy TN.
Has thanked: 4 times
Been thanked: 159 times

Re: battery management switch

Postby g36 » December 29th, 2018, 8:36 pm

In addition to above a easy way to determine your loads and what amps are coming from which battery is to use a dc clamp on amp meter, or a amp clamp for your multimeter. These are pretty cheap now days and can be useful for many things beside the boat.
1997 Carver 405
Crusader xli
The Black Pearl
Soddy Daisy Tn.
User avatar

United States of America
km1125
Admiral
Admiral
Posts: 888
Joined: February 28th, 2017, 6:04 pm
Has thanked: 3 times
Been thanked: 215 times

Re: battery management switch

Postby km1125 » December 29th, 2018, 8:51 pm

As others have said, your switch is probably correct. I have the same boat (although older - '83) and have the 1-2-all switch too. It just designates which battery you are primarily using. There is no "house" and "engine" unless YOU designate them as such. When the engine(s) are running, they are charging whichever battery you are switched to, either 1, 2 or "both".

What kind of batteries do you have? How old are they? What do you typically leave running on battery when you're on the hook?

With a weaker battery (not bad, just older), some heavier loads (like the fridge and a few non-LED lights and some other stuff), and some resistance in the line caused by a corroded connection or two, your voltage to the device alarming may drop below the threshold. What is causing the "warning screech"?

Topic author Canada
SkyeToo
CYO Supporter
CYO Supporter
Posts: 10
Joined: November 7th, 2017, 2:43 pm
Vessel Info: 1989 36' aft cabin, galley down
full upper and aft deck canvas
Location: Ontario Canada
Has thanked: 3 times

Re: battery management switch

Postby SkyeToo » December 30th, 2018, 12:54 pm

Thank you all so much for these helpful posts.

First, all the batteries are brand new last July. 2 deep cycle house, 1 ignition, 1 genie.

The marina tech's told me a couple years ago that the switch was mis-wired - 2 being engine start, 1 being house. (backwards)
But that seems very difficult to confirm. I have tried all configurations. Yes, switch is in the "All" underway to ensure full charging (works fine).

Fridge only from say 9-3/4 am should not deplete the 2 deep cycle batteries which made me wonder if the switch was even working. Engine start battery also low overnight (can always start the boat with the genie charge if needed)

The screech comes from the upgraded charger unit - a low-battery warning signal in the unit. Not a bad think to have.

So all this makes me think there may be old corroded wiring that is at least part of the problem as I don't leave lights on overnight. (anchor light is an LED - draws nearly nothing). Ice maker off. Stereo off. In fact, I have even shut off many of the services (other than fridge) from the breaker panel to be sure no current is being drawn.

I still don't see why all 3 positions (1,2,all) permit engine start unless the engines draw from the starter battery regardless of the switch position.

Just can't see why with new charger, batteries etc I should have a low-voltage warnings after 6 or so hours.

Again, many thanks.
Bruce (Midland Ontario)
User avatar

United States of America
tomschauer
Admiral
Admiral
Posts: 1224
Joined: March 28th, 2016, 10:52 pm
Vessel Info: 1998 Carver 355
Suspicious Fishes !
1990 Proline 17CC
2018 Regal 1900ESX
Location: upper chesapeake bay
Has thanked: 114 times
Been thanked: 266 times

Re: battery management switch

Postby tomschauer » December 30th, 2018, 1:08 pm

As others have tried to explain, you don't really have a house and start bank. The battery selector switch powers both house and start loads with whatever bank is selected. Soooo, when switch is at 1, all 12 volt loads are powered by whatever batteries are connected to that side, including the engines. Same with the other positions.
User avatar

Canada
bud37
Admiral
Admiral
Posts: 2111
Joined: April 23rd, 2015, 10:22 pm
Vessel Info: 2001 350 Mariner
Has thanked: 271 times
Been thanked: 448 times

Re: battery management switch

Postby bud37 » December 30th, 2018, 4:17 pm

Bruce, if you had to guess, how long does your fridge run in say 1 hour.....it cycles so a total would be good so we can calculate what your usage approximates. You really should know which switch position is connected to your 2 deep cycles.
"There is nothing - absolutely nothing - half so much worth doing as simply messing about in boats.”
― Kenneth Grahame, The Wind in the Willows

Safe travels with light winds and calm seas.....

Cool Time ...out.
User avatar

Canada
Midnightsun
Admiral
Admiral
Posts: 920
Joined: March 27th, 2016, 2:27 pm
Vessel Info: The Midnight Sun
2007 41CMY
Volvo D6-370's
Location: Montreal, Canada
Has thanked: 79 times
Been thanked: 313 times

Re: battery management switch

Postby Midnightsun » December 30th, 2018, 6:14 pm

He did say 1 is house so I would think the dual house bank is on 1. Something is not right if you are draining those 2 new batteries in 4-5 hours. In fact that should easily last you all night and well into the morning unless you keep stocking the fridge all night long with warm beer. :drunk: Maybe a short in one of them? Happens once in a while although rather rare.
Cheers, Hans
2007 Carver 41 CMY
Twin Volvo D6-370's
Montreal, Canada
Midnight Sun I Photos

Return to “Electrical”



Who is online

Users browsing this forum: No registered users and 1 guest