Small System Suggestions?

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Posted by Jerry Allen on October 07, 2008, 01:38:46 PM

I have a system that draws 5 WH per hour 24x7. I have wind power at the site but it has changed drasticly in the last year. New batteries, new generator. The Wind has days where it does not blow enough to charge the batteries some times 4 and 5 days straight. Once the batteries reach a critical level there is no recovery. I want to supplent the site with solar.

I forgot to add I have 2 105 AH deep cyles batteries in series for a 24 volt system. I have visted this site for a couple of days full days, the wind system is not going to work here due to the lack of wind.

I am looking at;
1ea - Morningstar Sunsaver Ss-10L 10A, 24V Pwm

2ea - Global Solar 30W 12V Framed Solar Panel

Is this enough to keep this site alive or is it overkill?

« Last Edit: October 07, 2008, 04:16:25 PM by Jerry Allen »

Posted by James Cormican on October 08, 2008, 10:55:29 AM

Re: Small System Suggestions? (Reply #1)

do you mean a load that draws at 5W that is on 24hrs a day (120W-h/day)?

if so, a 60w array may be a little short in winter depending where you are.

60x .8= 48w --- 48w x 2 sun hours = 96W-h/day {estimated} (deficit operation)

a 60w array certainly wont hurt, but is by no means overkill for a constant load.

james
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Posted by Michael Riewer on October 08, 2008, 11:10:33 AM

Re: Small System Suggestions? (Reply #2)

^^^Agreed, it is by no means overkill, and possibly not enough for those cloudy days either. For $130 more over the global solars I would step up to the 85watt Kyocera panel and add a few more batteries for capacity. 100ah @ 24v just isn't enough capacity if you are going to have a constant load draining them with days of no wind or sun.

Posted by Jerry Allen on October 08, 2008, 11:58:05 AM

Re: Small System Suggestions? (Reply #3)

Thanks for the replies.

5 watt hours per hour 24 hours a day is correct, total 120 watt hours per 24 hours.

I was using 4 sun hours, located in Eastern Wyoming. We very seldom have overcast days and no wind. Jumping to 100 watts total of panels is not a huge amount more. That is my intention so;

Adding 2 more 100AH batteries and the solar panels. 100 * .8 = 80 * 2 = 160 even if the sun only shines for 2 hours + counting the deficit and there is no wind. I should be 100% reliable?

Thanks again.

Jerry

Posted by James Cormican on October 08, 2008, 12:12:28 PM

Re: Small System Suggestions? (Reply #4)

well, with a variable resource, nothing is 100%. but that takes in the critical design considerations necessary to enable the system to be more likely to succeed.

remember, batteries will have losses, voltage drop losses, inverter losses, etc . . .

but more power should be way closer to getting the job done

the closer you are to a 1:1 ratio between production and storage, the better. the absolute minimum for array wattage is a 1:1 ratio between production and load (after derations).

james
altE staff

AltE
"Making Renewable Do-able"
http://www.altEstore.com/

Tel: 877.878.4060 x107 or +1.978.562.5858 x107
Fax: 877.242.6718 or +1.978.562.5854

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Small System Suggestions?

Posted by Jerry Allen on October 07, 2008, 01:38:46 PM

Posted by James Cormican on October 08, 2008, 10:55:29 AM

Posted by Michael Riewer on October 08, 2008, 11:10:33 AM

Posted by Jerry Allen on October 08, 2008, 11:58:05 AM

Posted by James Cormican on October 08, 2008, 12:12:28 PM

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