Help - Garage ligths & fan

[sangamesh104]

Hello all.

I am looking for advice on lighting, radio & a small fan for my detached garage. It is 2 car garage.
I live in Austin and when i checked this website:- http://www.gaisma.com/en, it gave me lowest insolation number is 2.5
Currently I run long extension cable to the garage for air compressor/ lighting etc in the Garage...
What I am looking at couple of panels on Amazon (12v Renogy 100w Monocrystalline Photovoltaic PV Solar Panel Module) that can charge a battery, and then I can hook up lights, radio & fan to that battery...

usage:-
6 LED lights 3 hrs a day each assumed 5W - total 90whrs
Fan - 20W, want to have to continuously On to get good air circulation (found vornado flippi V6 fan that consumes roughly 20w on high speed with oscillation) = total 480whrs
Radio - 10w 2hr - total 20whrs

Total daily load (Watt hours) 590
Total daily load (Watt hours including inverter losses, got a 400W inverter and a PWM charge controller) 590 X 2 (fudge factor) = 1180whrs

Considering my panels generate 200w for 2.5hrs i get 500whrs of energy everyday but i need 1180whrs including inverter losses...
Dividing this 1180 with 12v i get 98.3AH for total usage

The daily load i took the worst case scenario, will be lesser than what i projected...

Please let me know:-
1) if any of my calculations got busted
2) what kind of battery i should be getting (eg:- 12v 200AH i am guessing usual replacement of battery for every 5 years, so more money to put into it also, will it be more expensive going to solar than running extension chord???)
3) Do i need to add more than 2 panels ?
4) Can i run the LED's directly from panels while charging battery (pwm charge controller got a load o/p, i found 8v to 24v i/p LED's on amazon)
5) anything else that i would have missed?

Thanks a lot in advance for everyone...


Cheers,
San

[Mike90250]

leave the air compressor powered from the house !

Use a Pure Sine Wave inverter, it's much better for the motor in the fan and your electronics.

Battery would be two 6v 200ah golf cart batteries in series to give you 12V. Flooded batteries last longer than sealed, if you add distilled water when needed.

You need a fuse at/near the battery to protect the wires from a short circuit.

Conserve power - with 90w of LED lighting, you could get sunburn.

[sangamesh104]

Thanks a lot Mike for the I/P...
Regarding fuse did you mean add fuse at the i/p to batteries as well at o/p of batteries incase if any battery dies fuse will protect everything accordingly!
Got Trojan T105 6v 225AH batteries...
Will update once the system is up and running...

Cheers,
San

[Mike90250]

Just one fuse at the + terminal of the battery bank. The wire should be large enough to not choke the inverter. The fuse should be the size to protect the smallest wire connected to it.

[SunEagle]

Depending on what type of charge controller you have (some have output fusing) installing a fuse on the + wire going to the battery would be a safe bet. Again the fuse amp rating would be based on the wire size going to the battery.