solar charging of boat battery
 

Maybe I should give up guys.......

It seems to me that I need an oiltanker size boat to get enough power
for our 4 meter aluminium dinghy.

Any other suggestions?

Eddy




"Paolo Zini" wrote in message ...
I have photovoltaic panels over my house.
Don't remember exactly the size but is in the 10 square meters range (around
100 square foot, more or less).
The panels, placed at the correct angle, direction south, produces 1500
Watt (no typo, about 2 Hp) at noon in summer sunny day.
Disregarding efficency, if you have used 2 hp for 1 hour, you need 1hour of
sun at right angle...
Here, in Italy, the price is in the 10000-15000 $ range :-( maybe in USA is
a bit less, but not so much...
You can compute from this...

Paolo

My questions a

-- How many and which solar panels do I use?
-- What kind of a battery charger do I need?
-- What other equipment do I need?

solar charging of boat battery
 

Hmmm...lessee.

Requirement:
1/4 capacity of 100 Ah battery in 3 hours,
is 25 Amp hrs in 3 hrs
is 8 amps at 14 volts

Supply:
a 1 amp 12 volt solar cell might cost $40 if you were lucky.
So 8 amps might cost $3200 if you were very lucky.

(Unsure of the current efficiencies.... let's say solar = 3%
efficient)

Solar constant say 700 watts /m^2
at 3% efficiency for say 100 watts
= 100/(700 X 3/100) = 5 sq meters

Find a surface 17 feet long and 3 feet wide and cover it with
$3200 of solar cells

(My figures are probably rather optimistic....)

Brian




On 20 Nov 2003 02:09:08 -0800, (Edwin Antonius
van Gorp) wrote:

Thanks to all you guys..

The battery is an 100 Ah marine deep cycle battery and We are using
the motors for fishing purposes. The boats are sometimes for 2 or 3
hours on one location in full sun in the south of Spain. Even if the
battery would be charged for a 1/4th of the full capacity that would
be great.

Eddy


Glenn Ashmore wrote in message news:oDSub.9601$0K4.7152@lakeread04...
Not a bad plan. It just takes a LOT of patience. :-)

JerryS wrote:
Well Eddy, so far none of the replies have been of much encouragement ......
for me either. I was contemplating utilizing a 12 volt marine battery in
my ..... canoe so that when those long stretches of wind in my face
flat-water occurred, I could just get a boost.
Then when the battery got low I figured to use a solar charger to reload the
battery. Looks like a bad plan.
Jerry

solar charging of boat battery
 

Row?
DF
"Edwin Antonius van Gorp" wrote in message
om...
Maybe I should give up guys.......

It seems to me that I need an oiltanker size boat to get enough power
for our 4 meter aluminium dinghy.

Any other suggestions?

Eddy




"Paolo Zini" wrote in message
...
I have photovoltaic panels over my house.
Don't remember exactly the size but is in the 10 square meters range
(around
100 square foot, more or less).
The panels, placed at the correct angle, direction south, produces 1500
Watt (no typo, about 2 Hp) at noon in summer sunny day.
Disregarding efficency, if you have used 2 hp for 1 hour, you need
1hour of
sun at right angle...
Here, in Italy, the price is in the 10000-15000 $ range :-( maybe in USA
is
a bit less, but not so much...
You can compute from this...

Paolo

My questions a

-- How many and which solar panels do I use?
-- What kind of a battery charger do I need?
-- What other equipment do I need?