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What size solar panel would be needed to operate a small device needing 2 amps. to run for a short times ....?
I asked this question and did get a good answer , so i thought I would be more detailed about what I am trying to do and get a final answer before I make my purchase of a panel kit. A security camera that needs 5 volts and 2 amps. to run. that is connected to a 400 watt 8 amp. power inverter. That would be attached to a rechargeable sealed 18 ah 12 volt battery. Note : I already have camera, inverter and the battery. The camera would only be on drawing power when viewing being it can be remotely turned off and on. Panel would have average sun light during the day - (est. 6-8 hours daily). So with the detailed info. : Need 5 volts 2 amps. to run my wireless camera . I have a 12 volt 18 ah sealed rechargeable battery and a 400 watt 8 amp. inverter. Camera only on a few times daily for short periods to view.
In simple terms ( new to solar stuff ).... what size solar panel in watts / amps is needed to keep battery charged up and ready when needed ? Am I correct that amp output of panel could be slightly less then the 2 amps.that's needed to run camera being it would get the power ( the 2 amps) from battery and then panel would recharge the battery back up to full power when not on and drawing any power ?. My research tells me a 40 watt , 3 amp. panel would work ?. Thank you in advance for any help and advice. Please keep simple if possible !
Thanks for the help and advice. As I stated I already have the 12 volt battery, the inverter, and the camera.That is what I will use. It is a ac camera with a standard 110 plug to be plugged into a wall outlet. Being this is going to be used at a remote site and no power I need to use a converter.
Looking for answer based on info. I provided above. Will say the camera would be on under 3 hours a day if that helps. I just want to buy a panel with converter that will work with what I have. Thanks
Answer
you need to compute the watt hours used per day . it takes 24watts(12v times 2a) say for 0.5 hours total . that would be 12 watt hours . allowing the battery as 50% efficient so thats 24watt hours input needed. but the inverter has losses too so youre looking at say 32watt hours . A rule of thumb is that in europe and northeast US you can reckon on about 3 times peak panel output per day . so you would need a 11 watt panel to generate 32 watt hours . looked at in amps 11 watts is about 1 amp peak from the panel.
you can adjust these ball park figures depending on your estimate of the total hours that the camera runs.
I agree with Steve that a 6volt battery and panel would be better and eliminate the inverter . his approach is the correct engineering way and needs less than half the power and therefore half the size of panel for a 12 volt system . I know you want to use the parts you have so using my calculations above you have said 3hours running so i need to multiply my above calculation by 6 = 66 watt panel.
in most of US you get a higher sun level so you probably would be able to use around 45 watts panel.
you need to compute the watt hours used per day . it takes 24watts(12v times 2a) say for 0.5 hours total . that would be 12 watt hours . allowing the battery as 50% efficient so thats 24watt hours input needed. but the inverter has losses too so youre looking at say 32watt hours . A rule of thumb is that in europe and northeast US you can reckon on about 3 times peak panel output per day . so you would need a 11 watt panel to generate 32 watt hours . looked at in amps 11 watts is about 1 amp peak from the panel.
you can adjust these ball park figures depending on your estimate of the total hours that the camera runs.
I agree with Steve that a 6volt battery and panel would be better and eliminate the inverter . his approach is the correct engineering way and needs less than half the power and therefore half the size of panel for a 12 volt system . I know you want to use the parts you have so using my calculations above you have said 3hours running so i need to multiply my above calculation by 6 = 66 watt panel.
in most of US you get a higher sun level so you probably would be able to use around 45 watts panel.
what are the best security cameras to use for night recording? IR or low lux?
mattmo91
I am putting in a surveillance system because our house is getting constantly tp'ed and want to figure out who is doing it. Cost isn't really a problem but within reason, I obviously am not going to install FLIRs around my house but something in the $100-200 range per camera. Also, does anyone have any good DVRs in mind? I want the best picture quality and internet viewing.
Thanks!
Answer
What is your budget?
You have lots to choose from:
"kits":
http://shop4.outpost.com/search?cat=-45930&pType=pDisplay
I use these cameras:
http://shop4.outpost.com/product/5080315?site=sr:SEARCH:MAIN_RSLT_PG
And a DVR like this:
http://shop4.outpost.com/product/5264307?site=sr:SEARCH:MAIN_RSLT_PG
with a 250 gig hard drive
http://shop4.outpost.com/product/4570717?site=sr:SEARCH:MAIN_RSLT_PG
What is your budget?
You have lots to choose from:
"kits":
http://shop4.outpost.com/search?cat=-45930&pType=pDisplay
I use these cameras:
http://shop4.outpost.com/product/5080315?site=sr:SEARCH:MAIN_RSLT_PG
And a DVR like this:
http://shop4.outpost.com/product/5264307?site=sr:SEARCH:MAIN_RSLT_PG
with a 250 gig hard drive
http://shop4.outpost.com/product/4570717?site=sr:SEARCH:MAIN_RSLT_PG
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