Daily amp hours for 200 watts? - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
 Not a Member? 
  #1  
Old 03-03-2009
66luders's Avatar
Junior Member
 
Join Date: Jan 2007
Location: Oahu
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
66luders is on a distinguished road
Daily amp hours for 200 watts?

I have two panels in parallel totaling 200 watts which feed a morningstar MPPT charge regulator. According to the meter I am only getting between 10 and 15 amp hours on a average day here in Hawaii. One panel is a kyocera 65 watt and the other is a kyocera 135 watt. Both panels max voltage is around 17 volts... and they are in parallel.
The charge regulator is a three stage regulator and the voltage is usually around 14.5 volts for my wet cell batteries.

during the day I shut off the battery charger and all lights and fans, there is virtually no amperage draw on my batteries. So I am wondering if the batteries are fully charged and the regulator is only showing the amperage that the batteries are accepting.
Reply With Quote Share with Facebook
  #2  
Old 03-03-2009
Senior Member
 
Join Date: Jul 2008
Location: chesapeake bay
Posts: 1,942
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
scottyt is on a distinguished road
the math is easy but real life is not, the math is amp = watts divided by volts or 200 / 14.5 or about 13.8. so thats what in a perfect world you get per hour. so either your banks are charged or you have a problem. do you have a dump on the controller ? you might want to try a night with out the charger and just let the panels do the work the next day and see what the meter says the next day.
Reply With Quote Share with Facebook
  #3  
Old 03-03-2009
sailingdog's Avatar
Telstar 28
 
Join Date: Mar 2006
Location: New England
Posts: 43,291
Thanks: 0
Thanked 9 Times in 9 Posts
Rep Power: 13
sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice sailingdog is just really nice
Quote:
Originally Posted by 66luders View Post
I have two panels in parallel totaling 200 watts which feed a morningstar MPPT charge regulator. According to the meter I am only getting between 10 and 15 amp hours on a average day here in Hawaii. One panel is a kyocera 65 watt and the other is a kyocera 135 watt. Both panels max voltage is around 17 volts... and they are in parallel.
The charge regulator is a three stage regulator and the voltage is usually around 14.5 volts for my wet cell batteries.

during the day I shut off the battery charger and all lights and fans, there is virtually no amperage draw on my batteries. So I am wondering if the batteries are fully charged and the regulator is only showing the amperage that the batteries are accepting.
If your system is showing 14.5 VDC, that is a bulk charging phase voltage unless your charge controller is screwed up. The batteries should be accepting everything those two panels can put out.

How big is your batter bank?? BTW, 17 volts sounds a bit low for max voltage. You probably would have been better off with two 100 watt panels, rather than a 135 and a 65...

Also, are you sure it is only showing 15 AMP-hours, not 15 AMPS. What kind of battery monitor are you using. The Morningstar charge controllers probably only show AMPS, not amp-hours. A battery monitor, like a Link 10, would show AMP-hours.
__________________
Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



All times are GMT -4. The time now is 03:52 AM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012