[Public-List] Solar

[John Boor via Public-List]

To get back the 50Ahrs you must also include system drawn during the day
light hrs.  When I installed my panels I derated the panels by 50% to take
into account morning and evening low angle of the sun.  As an example I
had 185w panels and considered the available power to be at the most 90w
for the day.  even after that I never expected to recharge the batteries
completely instead to suppliment usage, when I was anchoring I could go a
minimum of 5 days before I had to use the engine.  In most cases I was
never in one place that long before I moved, BTW I had 400Ahrs of
batteries.

John Boor
Ex MAHSEER #380

> To get 50 amps back into one's system, You would be looking at (based on 4
> hrs peak sun) a minimum 144W (18V nominal) giving you 8amps. Â With an
> mppt charge controller to covert that 8A @ 18V to 12A @ 12V. And that is
> assuming 100% conversion. Â You would also be counting on the off peak sun
> to charge up that last 15% of the battery capacity as that always takes
> longer that the main bulk charge. A partially cloudy day, off angle panel
> etc and you won't be able to get your 50A. Â To cover that sort of
> eventuality in case you NEED to get back those amps every day plan on 240W
> or more.
>
> Just my 2 cents
> Greg
> Impromptu #592
>
>
> Sent from Samsung Mobile
>
> <div>-------- Original message --------</div><div>From: Amy & David
> Swanson via Public-List <public-list at lists.alberg30.org>
> </div><div>Date:06-19-2016  7:10 PM  (GMT-05:00) </div><div>To:
> public-list at lists.alberg30.org </div><div>Subject: Re: [Public-List] Solar
> </div><div>
> </div>I doubt you are going to get 50 amp hours/day into a battery out of
> a
> solar rig unless you have a lot of panel area, unblocked & properly
> oriented.  A 60 watt panel will peak at about 5.2 amps.  Even a very low
> battery will not take much more than half of those.  If the panel is
> partially blocked, you will get nothing.  If the sun is at a low angle
> or if it is overcast, you won't get much either.
>
> That being said, modern controllers and lower prices make solar a lot
> more viable than just a few years ago.  Spend some time researching
> controllers.  My boat slip faces due south, I put a 40 watt panel on the
> fore deck angled up about 25 degrees (less than optimal), and it
> recharges my group 24 over the week consistently.  I only have plug into
> shore power to do maintenance or such.
>
>
> On 6/18/2016 12:47 PM, via Public-List wrote:
>>
>> I am not sure about your 50 amp hour requirement but i have a 60 watt
>> panel in a stationary position on my pushpit and it keeps me powered
>> 24/7. I never plug in to shore power.
>>
>>
>> The panel goes to a charge controller and feeds 2, 105 amp hour deep
>> cycle batteries.
>>
>>
>> I don't have much draw though. I have a 800gpm bilge pump which rarely
>> runs, vhs, gps, and led lights. Toilet is a lavac.
>>
>>
>> We never use our inverter.
>>
>>
>> I have a few fans and charge my phone and tablet (and so does my wife)
>> and we've lived aboard for up to 9 days with no problem.
>>
>>
>> We have a small outboard mounted in the lazarette.
>>
>>
>> Our boat is in south Georgia so your mileage may vary.
>>
>>
>> The solar panel is the best thing I ever put on my boat.
>>
>>
>> - George, #439, St. Simons Island, Ga.
>>
>>
>>
>>
>> Get Outlook for Android
>>
>>
>>
>>
>>
>>
>> On Sat, Jun 18, 2016 at 12:06 PM -0400, "tmthypk at gmail.com via
>> Public-List" <public-list at lists.alberg30.org> wrote:
>>
>>
>>
>>
>>
>> I am doing a little research on solar panels, there is a lot out there!
>> I think, if I figured this our correctly, I want to anticipate at most
>> 50amp/h a day when I am out. What is people experience with this who
>> have gone this route and how big of a panel should I look at, where have
>> you found the best placement, and where or what did you buy? I'll offer
>> a few beers over a conversation, as I much rather prefer talking to
>> people than reclusively searching the Internet from my couch!
>>
>> Timothy Peek
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>
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