Small Solar Proposal
Re: Small Solar Proposal
So, increase battery size or panel size?
Or both...
Or both...

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 Joined: Aug 03 2010 10:33pm
 Location: Sydney ..(Hilly part !) .. Australia/ Down under !
Re: Small Solar Proposal
FYI .. that 100W panel rating is a peak figure assuming maximum sun at noon, with ideal panel orientation to that sun, and before any losses in the chargers etc.
i am guessing your panels may not be idealy oriented to the sun much of the time ?
I would suggest you derate the panel output by 50% ...even in full sunshine days !
i am guessing your panels may not be idealy oriented to the sun much of the time ?
I would suggest you derate the panel output by 50% ...even in full sunshine days !
This forum owes its existence to Justin of ebikes.ca
Re: Small Solar Proposal
I found data showing >1000 watts per square meter, 6 hours per day on average for that area, at that time of year.
If 18% efficient, the panels could produce max 6.5 amps for 6 hours avg, and another 2 hours worth for the remaining 8 hours of daylight on either side of panel saturation.
52 ah per day average times 3 panels,
less 4% losses,
makes 50 ah per day per panel,
For 3 panels, 150 ah per day, average, in June.
Versus 90 ah draw avg and that's conservative.
I can accommodate low voltage if need be in order not to plummet below LVC,
it just complicates things onboard.
I have got excellent panel orientation and unobstructedexposure to the sun.
10 percent offvertical sunangle at noon.
15 hours+ of sun above the horizon
Small eastwest panel curvature.
Summer solstice.
I feel much better about the numbers.
Seatrials will tell the story and another two, smaller panels could be added.
Where ( in Canada ) can get 1  2 liters (quarts), 2part polyurethane to pour in my battery box to mitigate impact?
Not waterhull pounding but striking big, huge, semisubmerged logs, containers, whales, submarines, rocks at speed, day or night.
Silicone, rubber, latex, anything two part that I can pour while the battery is suspended in the box.
2" under and 1" around the front encapsulating the battery, terminals and all.
Thank you.
If 18% efficient, the panels could produce max 6.5 amps for 6 hours avg, and another 2 hours worth for the remaining 8 hours of daylight on either side of panel saturation.
52 ah per day average times 3 panels,
less 4% losses,
makes 50 ah per day per panel,
For 3 panels, 150 ah per day, average, in June.
Versus 90 ah draw avg and that's conservative.
I can accommodate low voltage if need be in order not to plummet below LVC,
it just complicates things onboard.
I have got excellent panel orientation and unobstructedexposure to the sun.
10 percent offvertical sunangle at noon.
15 hours+ of sun above the horizon
Small eastwest panel curvature.
Summer solstice.
I feel much better about the numbers.
Seatrials will tell the story and another two, smaller panels could be added.
Where ( in Canada ) can get 1  2 liters (quarts), 2part polyurethane to pour in my battery box to mitigate impact?
Not waterhull pounding but striking big, huge, semisubmerged logs, containers, whales, submarines, rocks at speed, day or night.
Silicone, rubber, latex, anything two part that I can pour while the battery is suspended in the box.
2" under and 1" around the front encapsulating the battery, terminals and all.
Thank you.
Last edited by BlueBell on Mar 05 2018 2:32am, edited 1 time in total.
Re: Small Solar Proposal
Last edited by Markk786 on Sep 04 2018 4:23pm, edited 3 times in total.
Re: Small Solar Proposal
No
But I was planning to in the morning?
Why do you ask?
But I was planning to in the morning?
Why do you ask?
Re: Small Solar Proposal
John,John in CR wrote: ↑Feb 28 2018 8:41am+1 Please be sure to share photos and video of your rig in action. Will it have foils?
What about storms? I can't even imagine flying a big powerful kite during a storm/
I was reviewing my thread and realized
I didn't answer your foils question.
No, it won't have foils.
The amount of debris in the water on the west coast of Canada can be staggering.
3 foot diameter, 60 foot long logs that are waterlogged and floating just at the surface (awash).
Then there are awash seacontainers floating around, submarines, whales and of course lots of rocks.
Foils are not an option, even if they kickup, like my centreboard.
So, I've designed the hull so it wouldn't benefit from foils.
Instead, it is extremely low drag and just wouldn't really benefit from foils.
Cheers.
Last edited by BlueBell on Apr 02 2018 2:50pm, edited 1 time in total.
Re: Small Solar Proposal
That is very, very unlikely. I have never seen a location (outside of some extreme cases, like high altitude glaciers) where you get >1000 watts per square meter for any length of time.
What you are likely referring to are equivalent sunhours  the adjusted hours of sun you can get that would add up to 1000 watts per square meter. In my area for example (San Diego) we vary between 5 and 6.5 hours of equivalent direct sun a day. This does NOT mean that you get 6.5 hours of 1000 watts per square meter; it means you get 14 hours of sun that is equivalent to 6.5 hours of "STC" sun (which is how panels are tested; 1000 watts per square meter of radiant energy.)
To be more accurate, we get between 5000 and 6500 watthours per square meter per day.
To convert that to electrical energy, you multiply by the panel efficiency and by the area. So if you have two square meters of panels, and they are 18% efficient (which would be very good) then you'd get 1.8 and 2.3kwhr a day out of the panel.
I don't have charts for Canada, but the closest I can get (near Vancouver) gets you between 1400 and 6200 watthours per square meter per day. So for you those two meters of panels would get you between 500 and 2200 watthours per day.
bill von
Re: Small Solar Proposal
Interesting, thanks billvon.billvon wrote: ↑Apr 02 2018 1:02pmThat is very, very unlikely. I have never seen a location (outside of some extreme cases, like high altitude glaciers) where you get >1000 watts per square meter for any length of time.
What you are likely referring to are equivalent sunhours  the adjusted hours of sun you can get that would add up to 1000 watts per square meter. In my area for example (San Diego) we vary between 5 and 6.5 hours of equivalent direct sun a day. This does NOT mean that you get 6.5 hours of 1000 watts per square meter; it means you get 14 hours of sun that is equivalent to 6.5 hours of "STC" sun (which is how panels are tested; 1000 watts per square meter of radiant energy.)
To be more accurate, we get between 5000 and 6500 watthours per square meter per day.
To convert that to electrical energy, you multiply by the panel efficiency and by the area. So if you have two square meters of panels, and they are 18% efficient (which would be very good) then you'd get 1.8 and 2.3kwhr a day out of the panel.
I don't have charts for Canada, but the closest I can get (near Vancouver) gets you between 1400 and 6200 watthours per square meter per day. So for you those two meters of panels would get you between 500 and 2200 watthours per day.
The data was from Environment Canada and what it stated was "peak sun hours of 6 per day, average, for that area in June.
We measure about 1000 watts/square meter in the area so I equated it to that. I then tacked on an hour on each side of that for the other 12 hours of daylight and a PMMT.
Perhaps the calibration is not set correctly and it is less than 1000 watts.
What max values do you measure per square meter?
Re: Small Solar Proposal
BlueBell wrote: ↑Apr 02 2018 2:58pmInteresting, thanks billvon.billvon wrote: ↑Apr 02 2018 1:02pmThat is very, very unlikely. I have never seen a location (outside of some extreme cases, like high altitude glaciers) where you get >1000 watts per square meter for any length of time.
What you are likely referring to are equivalent sunhours  the adjusted hours of sun you can get that would add up to 1000 watts per square meter. In my area for example (San Diego) we vary between 5 and 6.5 hours of equivalent direct sun a day. This does NOT mean that you get 6.5 hours of 1000 watts per square meter; it means you get 14 hours of sun that is equivalent to 6.5 hours of "STC" sun (which is how panels are tested; 1000 watts per square meter of radiant energy.)
To be more accurate, we get between 5000 and 6500 watthours per square meter per day.
To convert that to electrical energy, you multiply by the panel efficiency and by the area. So if you have two square meters of panels, and they are 18% efficient (which would be very good) then you'd get 1.8 and 2.3kwhr a day out of the panel.
I don't have charts for Canada, but the closest I can get (near Vancouver) gets you between 1400 and 6200 watthours per square meter per day. So for you those two meters of panels would get you between 500 and 2200 watthours per day.
The data was from Environment Canada and what it stated was "peak sun hours of 6 per day, average, for that area in June".
We measure about 1000 watts/square meter in the area so I equated it to that. I then tacked on an hour on each side of that for the other 12 hours of daylight and a PMMT.
Perhaps the calibration is not set correctly and it is less than 1000 watts.
What max values do you measure per square meter?
Re: Small Solar Proposal
BlueBell wrote: ↑Apr 02 2018 2:58pmBlueBell wrote: ↑Apr 02 2018 2:58pmInteresting, thanks billvon.billvon wrote: ↑Apr 02 2018 1:02pmThat is very, very unlikely. I have never seen a location (outside of some extreme cases, like high altitude glaciers) where you get >1000 watts per square meter for any length of time.
What you are likely referring to are equivalent sunhours  the adjusted hours of sun you can get that would add up to 1000 watts per square meter. In my area for example (San Diego) we vary between 5 and 6.5 hours of equivalent direct sun a day. This does NOT mean that you get 6.5 hours of 1000 watts per square meter; it means you get 14 hours of sun that is equivalent to 6.5 hours of "STC" sun (which is how panels are tested; 1000 watts per square meter of radiant energy.)
To be more accurate, we get between 5000 and 6500 watthours per square meter per day.
To convert that to electrical energy, you multiply by the panel efficiency and by the area. So if you have two square meters of panels, and they are 18% efficient (which would be very good) then you'd get 1.8 and 2.3kwhr a day out of the panel.
I don't have charts for Canada, but the closest I can get (near Vancouver) gets you between 1400 and 6200 watthours per square meter per day. So for you those two meters of panels would get you between 500 and 2200 watthours per day.
The data was from Environment Canada and what it stated was "peak sun hours of 6 per day, average, for that area in June".
We measure about 1000 watts/square meter in the area so I equated it to that. I then tacked on an hour on each side of that for the other 12 hours of daylight and a PMMT.
Perhaps the calibration is not set correctly and it is less than 1000 watts.
What max values do you measure per square meter?
Note: It would be less per square yard as it is smaller.
Re: Small Solar Proposal
During a normal summer day at best incidence, around 750800 watts. The only time I have seen close to STC power (i.e. 1000 watts per square meter) is right after a rain. Then:BlueBell wrote: ↑Apr 02 2018 2:58pmThe data was from Environment Canada and what it stated was "peak sun hours of 6 per day, average, for that area in June.
We measure about 1000 watts/square meter in the area so I equated it to that. I then tacked on an hour on each side of that for the other 12 hours of daylight and a PMMT. Perhaps the calibration is not set correctly and it is less than 1000 watts.
What max values do you measure per square meter?
1) The panels are clean
2) The panels are cool
3) When the Sun first comes out you get cloud lensing (i.e. intensification of sunlight)
Under those conditions I sometimes see my smaller inverter hit its limit, which represents 994 watts per square meter.
bill von