Reply
 
Thread Tools Search this Thread Display Modes
 
Old 03-17-2015, 08:34 PM   #1
Lt. JG
 
SimonM's Avatar
 
Join Date: Jun 2014
Posts: 32
Default Portable solar panel battery maintainer - suggestions?

Anyone out there use one of these: Amazon.com: Schumacher SP-200 2.4W Solar Battery Maintainer: Automotive or something better/similar?... I have a Maxum 2300SC with 2 12v Deka Marine Master DC27 batteries... although I have shore power available on my dock, I don't like the idea of lugging a mains charger to and from the boat (and the potential resulting electrolysis), so figured a solar maintainer might be the way to go to keep battery 1 topped up and feeding the automatic bilge pump?
__________________

SimonM is offline   Reply With Quote
Old 05-20-2016, 03:08 PM   #2
Ensign
 
Join Date: May 2016
Posts: 3
Default

This is interesting, has anyone used anything like this? Does it keep the battery charged when just hanging out with radio on and no external power supply?
__________________

StillSinking is offline   Reply With Quote
Old 05-20-2016, 03:19 PM   #3
Lt. JG
 
SimonM's Avatar
 
Join Date: Jun 2014
Posts: 32
Default

I went ahead and bought the model referred to in my original post... it works surprisingly well... I have it connected via croc clips directly to the battery terminal, but it also comes with a cigarette lighter option... not sure how (or how well?) that works, but the direct-to-battery option works pretty well
SimonM is offline   Reply With Quote
Old 05-20-2016, 04:23 PM   #4
Moderator

 
Join Date: Apr 2008
Posts: 3,551
Default

The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V): I(A) = P(W) / V(V)

So amps are equal to watts divided by volts [amp = watt / volt]

2.4/12 = 0.2 amps

10 hrs of direct sunlight would return 2 aH to the system.

This would be a solar trickle charger to offset the discharge rate of batteries sitting for extended period of time we no amp draw.
__________________
Leave me alone, it's Boating Season!!!
shrew is offline   Reply With Quote
Old 05-21-2016, 04:18 AM   #5
Admiral
 
mmwjr's Avatar
 
Join Date: Feb 2012
Location: Perry Hall, Maryland
Posts: 5,391
Default

The .2 amps that shrew calculated is best current in a sunny day. A radio will use more than that so the solar panel will help but the battery is still discharged.
__________________
Mike
mmwjr is offline   Reply With Quote
Old 05-21-2016, 04:09 PM   #6
Captain
 
Phillbo's Avatar
 
Join Date: Mar 2012
Location: Arizona
Posts: 851
Default

Why not install a marine grade charge on the boat since you have shore power available. I had the same boat with the 7.4L and the charger fit nicely in the engine compartment.
__________________

Phillbo is online now   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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


Powered by vBadvanced CMPS v3.2.3

All times are GMT. The time now is 09:58 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2017, vBulletin Solutions, Inc.