25W of solar panel question

[ecusolar]

I dought that your panel has 10Amps, how many cells do you have?

Can you make a picture to post?

Is it the capacity of solar panel important? As my solar panel only about 25W/10AMP = 2.5volt, can it actually afford to my project?Thank you very much, should any question arises, i will ask for help again, thank you.

[lsy388]

Is it the capacity of solar panel important? As my solar panel only about 25W/10AMP = 2.5volt, can it actually afford to my project?Thank you very much, should any question arises, i will ask for help again, thank you.

[Mike90250]

Thanks for your advice, would you pls kindly also advice base on my 25W solar panel, how many volt of controller and inverter will suit to it? Also what is the capacity of deep cycle battery should i use? Thanks.

I'll assume a 25V panel designed for 12V.
I'd look at the Trace C-12 controller. That can handle up to 12A of power, it's rugged, ready to go out of the box, and simple.

The $90 battery at a big box store will be around 85-100 AH capacity. I'm looking for the best deal for you, not the battery sized to 0.001% of the theory for a 25W panel. A 30AH battery is likely the "optimal size" but it will cost you nearly as much as the "big box store" battery.

Inverter - that depends on what you will power with it. The $45 mod-sine inverters sound like a great deal, till they fry your $200 cordless drill charger.
Read the Inverter FAQ http://www.solar-electric.com/solar_...r_electric.htm
it may help you decide.

[lsy388]

Thanks for your advice, would you pls kindly also advice base on my 25W solar panel, how many volt of controller and inverter will suit to it? Also what is the capacity of deep cycle battery should i use? Thanks.

[Mike90250]

If you ever think you may want to expand your plans, I would suggest using a charge controller that would handle your expanded ideas.
Generally, the most cost effective is the "Deep cycle, marine battery" sold at big box stores, around $90. Amps per $, it can't be beat.
With only a 25W panel, it will be real easy to drain your battery below what your panel can recharge in 2 days.
I would get a good volt meter, it can be a very usefull tool.
Also, read and print the battery FAQ http://www.windsun.com/Batteries/Battery_FAQ.htm
It has a nice voltage chart, and you really don't want to go below 70%, with only a 25W charge controller.
Also, at a boating store, get a plastic battery box. only about $10, and will contain acid if any leak develops. having 1 battery in a house is not bad, but it could make a mess.
At a autoparts store, get a inline fuse holder, with about a 10A fuse, and attach to the + terminal. Nice to have something inline for safety, if a whire shorts out.

[lsy388]

Hi, i am a beginner of solar maker, i just need some advice about my new 25w solar panel project. May i know if i use 25W of solar panel, what is the capacity of solar controller, storage battery, or even inverter am i suppose to use? As i need to support 5 led light and 1 fan. Please kindly advice, thanks.