Yeah, and is good to put my back yard to good use, since my yard are all concrete slabs.

Not easy to group buy lah, especially when dealing with bulky items and pricey stuff. Expert exchange, hey we have forum here to share and is also a good knowledge base for future reference.

Never the less, a cup of tea (of few cups) if good for building up friendship.

Battery are the cost killer, don't forget you need thick wires because of the high current.

12v are more common, but you need cables that can handle 200 - 300Amps minimal that is using welding cables.

Where got 0.218, have to use 0.45 more realistic unless that is the only equipment. As for the consumption, it should be around 100-150watt per hours because compressor and heater not always switch on, usually only 1/3 the operation time are switch on. 0.4kw/h * 0.33 *24 *30 = 95Kwh * 0.45 = ~RM 42

RM 42, a price to pay for convenient

This post has been edited by weikee: Apr 28 2015, 02:41 PM

You and I not that level lah. I stick with my 3M filter enough if need cold water, just take the ice, if need hot water just boil it.

The more appliances you have the more expensive you will be paying.

If you are paying at 0.218, that mean you are using less than 200 units per month. I am impress how you can achieve this. Can you describe to me what appliances you have, and how long it run a day?

The last I did help my friend calculate, his meter was tempered and he reported it back to TNB. Lucky enough he did not have to pay anything because he just got the house 2nd hand, and TNB when chase after the original owner

Nice design, the spec say is 100KG, guess is a LiPo or similar technology.

AH, and KWH is difference, you may have good 30mins and end up the juice are gone especially when you use old car battery. After deep charged your battery performance will drop and lifespan will be affected.

Also you need to take note LeadAcid battery release Hydrogen gas when charging, make sure you have better ventilation, if not you are just putting timebomb in your house especially you put many of it in one location.

Haha, its also one of the problem in hybrid car. Friend repaired his pirusC, inverter board problem. Almost 20k. Lucky still got few months warranty.

Lexus hybrid battery >20k

My advice, don't invest in battery. You spend lots of money on battery and not gaining back. Battery lifespan are like 2 years some maybe 3.. not worth it.

One question, i am planing to build a solar+battery powered raspberry pi cctv, and need a solar charger controller. I saw most controller have this output with "bulb" indicator. Is that a DC output? Eg below

https://www.lelong.com.my/20a-12v-24v-solar...7-01-Sale-I.htm

Ok, that output is set-able, will need to run 24x7 for my rapsberry +camera. Will about 7watt include loss.

Raspberry camera is very low power. And with Pi Zero, will be low power.

http://raspi.tv/2016/raspberry-pi-zero-1-3...age-with-camera

Best things for Raspberry pi camera, it have a version for low light infra red camera (noir)

https://www.youtube.com/watch?v=lP-QQGxm2Y0

Maybe couple of hundred mAmp to power the infrared LED.

will try small scale first, maybe 2x 7ah 12v seal lead acid for the 12 hours night, while day will use 30watt solar panel charge and supply the pi. Will try it for RnD purpose.

Is ok, will test out first once in "production" I will build another unit. Since I am planing to put multiple cctv with self power. My last test using a basic USB watt meter (pi power via usb), it only take 4watt per hour.

got myself a 50watt instead, waiting for delivery. About a month.

https://ezbuy.my/product/20000003383568.html

Yeah, with the Prime member my delivery from China to Malaysia is RM 8.80 + Local delivery RM 8, ok lah.

My Cheap China Solar charger controller and Panel.






After test few time, i accidentally reversed polarity of the batter. Damn. The Solar Diode is fried but still able to chunk out power. Hope no damage. The Charger controller still power up, but when i measure voltage it seem output too high now, will need to look into the circuit if I can fix it or not.