SailNet Community - View Single Post - Daily amp hours for 200 watts?
View Single Post
post #3 of Old 03-03-2009
Telstar 28
sailingdog's Avatar
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 18 Times in 14 Posts
Rep Power: 16
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.


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.

sailingdog is offline  
Quote Share with Facebook
For the best viewing experience please update your browser to Google Chrome