Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 11-11-2015, 17:00   #91
Senior Cruiser
 
StuM's Avatar

Cruisers Forum Supporter

Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43
Posts: 6,707
Re: Battery Craziness

Quote:
Originally Posted by pbmaise View Post
Solar panels have come down in price so much battery banks should be sized based on:

#1 House bank - Enough to start engine

#2 Engine bank. Enough to start engine

Anything more is a waste of money and extra weight.

The reason is the refrigerator will stay cold overnight provided you have it well insulated and dont open every 5 seconds.

Solar regulators are a waste of money. If you yourself are not there to check and prevent batteries from overloading simply insert a voltage cutoff switch that shuts a solar off.

Use a similar voltage cutoff switch that allows the fridge to run when there is enough solar power.
So you don't use any power after mid-afternoon?

No house lighting, anchor light, radio, never sail after dark with nav lights/instruments, chartplotter, autopilot ?
__________________

__________________
StuM is offline   Reply With Quote
Old 11-11-2015, 17:10   #92
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: Battery Craziness

Quote:
Originally Posted by pbmaise View Post
Solar regulators are a waste of money. If you yourself are not there to check and prevent batteries from overloading simply insert a voltage cutoff switch that shuts a solar off.
The biggest cost reduction in solar panels have been in those that package the cells into higher voltage panels. Without an MPPT solar regulator, one cannot use these panels (unless one has a 32V or 48V battery bank).

I guess one COULD use these panels with a switch and much care, but they would be throwing most of their money away in doing so. More than the cost of an MPPT regulator.

It is getting very difficult to find nominal 12V panels any more, and they will surely be extinct in a few short years.

So even a cutoff switch won't help. MPPT solar regulators are pretty much mandatory now.

Mark
__________________

__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 11-11-2015, 17:10   #93
Senior Cruiser
 
colemj's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Location: Presently on US East Coast
Boat: Manta 40 "Reach"
Posts: 10,049
Images: 12
Re: Battery Craziness

Quote:
Originally Posted by StuM View Post
So you don't use any power after mid-afternoon?

No house lighting, anchor light, radio, never sail after dark with nav lights/instruments, chartplotter, autopilot ?
Start the engine, no problem.

You have a catamaran - it's not like you are going to sail...

Mark
__________________
www.svreach.com

You do not need a parachute to skydive. You only need a parachute to skydive twice.
colemj is offline   Reply With Quote
Old 11-11-2015, 17:21   #94
Senior Cruiser
 
skipmac's Avatar

Cruisers Forum Supporter

Join Date: Oct 2007
Location: 29 49.16 N 82 25.82 W
Boat: Pearson 422
Posts: 12,373
Re: Battery Craziness

Quote:
Originally Posted by StuM View Post
So you don't use any power after mid-afternoon?

No house lighting, anchor light, radio, never sail after dark with nav lights/instruments, chartplotter, autopilot ?

And of course there are never any cloudy days in Hawaii so the solar panels always produce full output.
__________________
The water is always bluer on the other side of the ocean.
skipmac is online now   Reply With Quote
Old 11-11-2015, 17:37   #95
Marine Service Provider
 
pbmaise's Avatar

Join Date: Jan 2007
Location: Pahoa Hawaii
Boat: Jay Kantola - Trimaran 65 ft by 40 ft beam
Posts: 579
Re: Battery Craziness

Each situation is different.

In my case, a bank big enough to start my engine is more than large enough to run all lights all night. I have changed all lights to small LED and fans to efficient computer fans. I also recommend a blinking blue light in addition to nave lights and it runs on two type D batteries for a month.

Each of my banks is 440 amp hours. Previously I carried 1600 amp hours and wasted a lot of fuel just trying to keep a bank that large fully charged. Batteries consume power just sitting there doing nothing and a big bank consumes more.

You are right about an autopilot needing juice if sailing at night, however at night either:
A. Sails are up and wind generator is adding power.
B. Engine is on and there is no wind and alternator is on.

At most I found I had to run my portable Honda 1 hour around 4 am because sails were up in light winds and autopilot consumed.

GPS consumes little at night.

Chart plotter is called my laptop computer and provided I dont leave it on, it runs off its own battery in standby mode no problem.

Radar is only turned on seldomly.
__________________
pbmaise is offline   Reply With Quote
Old 11-11-2015, 18:02   #96
Senior Cruiser
 
StuM's Avatar

Cruisers Forum Supporter

Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43
Posts: 6,707
Re: Battery Craziness

Quote:
Originally Posted by colemj View Post
Start the engine, no problem.

You have a catamaran - it's not like you are going to sail...

Mark
__________________
StuM is offline   Reply With Quote
Old 11-11-2015, 18:04   #97
Senior Cruiser
 
StuM's Avatar

Cruisers Forum Supporter

Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43
Posts: 6,707
Re: Battery Craziness

Quote:
Originally Posted by pbmaise View Post
Each situation is different.

In my case, a bank big enough to start my engine is more than large enough to run all lights all night....
Each of my banks is 440 amp hours.
What sort of engine do you have that need a 440 Ah bank to start it?
__________________
StuM is offline   Reply With Quote
Old 11-11-2015, 18:56   #98
Registered User

Join Date: Feb 2013
Location: WY / Currently in Hayes VA on the Chesapeake
Boat: Ocean Alexander, Ocean 44
Posts: 922
Re: Battery Craziness

Quote:
Originally Posted by StuM View Post
What sort of engine do you have that need a 440 Ah bank to start it?
Must be monster engines....

That is enough electricity to keep She Who Must Be Obeyed happy and She has an apt. sized refer. powered through an inverter.
__________________
darylat8750 is offline   Reply With Quote
Old 12-11-2015, 10:49   #99
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2014
Location: Anacortes
Boat: previous - Whitby 42 new - Goldenwave 44
Posts: 1,735
Re: Battery Craziness

Other than the cost of replacing batteries which could have lasted double the time, the big issue for me is replacing the batteries. Logistics, availability, hassle, bad back, access,....... Buying good batteries in Mexico - right size, quality, etc. is either prohibitively expensive or just a huge hassle, i.e. having friends bring them down from the US. Worse in Fiji, Tonga, even New Zealand. We get pretty used to how cheap and available some stuff is here in the good ol' USA that is either not available at any price or available at a huge price or available with a huge hassle and huge price.

Before I go on a long cruise to anywhere outside of my home port I make an analysis of the life expectation of my batteries, replace them if necessary, and then put equipment on so the batteries will predictably last X time period. To each his own. All this stuff can get expensive, but by far the biggest factor is how you take care of the batteries with whatever equipment you do have.
__________________
exMaggieDrum is offline   Reply With Quote
Old 12-11-2015, 20:09   #100
Registered User

Join Date: Feb 2013
Location: WY / Currently in Hayes VA on the Chesapeake
Boat: Ocean Alexander, Ocean 44
Posts: 922
Re: Battery Craziness

Golf carts are used all over the world. Their batteries are also easier on the back than those big boys are.
__________________

__________________
darylat8750 is offline   Reply With Quote
Reply

Tags
battery

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Link 10 Battery Monitor -Setting Battery Capacity hugh c Electrical: Batteries, Generators & Solar 3 02-05-2012 12:57
Battery Isolator with Battery Drain Bensigler Electrical: Batteries, Generators & Solar 83 28-11-2011 13:50
Battery Terminal Cover or Cover Entire Battery Top ? sdowney717 Electrical: Batteries, Generators & Solar 5 14-07-2011 05:14
Wiring My Battery Charger to the Battery Switch ? Shoalcove Electrical: Batteries, Generators & Solar 10 23-08-2010 17:24
Battery charger to replace battery? lilly Electrical: Batteries, Generators & Solar 5 22-07-2006 19:11



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 14:30.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.