George Harmony

Thanks again for the replies.

Just wanna share a funny story. As i said b4 i mooved into my unfished house and pumped water with a genset. After i used a dc pump nabors dont hear the genset anymore. One of them asked how i get water. Told him that i use a solar (panel) system and showed him. He then ask me if the panels also use fuel.....hahahahaha...really happend, a government officer at middle management level....unbeleivable.....

First i thought: Shall i laugh,did he make a joke..... I explained him how the system works and now he is also interested to use solar for some lamps only cause of the "too often" electrical outages in this area.

Again a question.

If i buy 2 batteries usually they are not 100% fully charged. Do i have to charge 1 by 1 before connect to paralel or can i connect then charge???

@jingjoe, i was thinking also about the possibility of using supercaps to start a fridge or aircon.

buy an inverter+charger with dual/triple MPPT PV inputs.

We have been talking about the possibility to measure voltage. if the PV panel give a certain voltage activate or cut.

Im not an electrician but is this perhaps a solution???

Cause I did not plan well there is a small problem if I buy other (bigger) panels.

Only solar panels of exact or similar current should be wired together in series. When you connect a 3A panel to a 3.5A panel, the overall current will be dragged down to 3A. Such a reduction in current will by all means lead to a reduction in power output and therefore loss in system performance.

http://solarpanelsvenue.com/mixing-solar-panels/

It means that I must have seperate independent systems.....or does someone know a solution to make it one (bigger) system??

In short, as a minimum spec for this system you'd probably use 2x 300W panels (~2400Wh/day avg min). a 200Ah 12V battery (2400Wh = ~40% DOD), and a 1000w nominal inverter that supports a 2000W peak to handle motor startup.

Thank you very much. Im orientating now on buying batteries. According to one supplier here a tubular deep cycle is one of the best for such purposes but rather expensive. He quoted a price of about 11.000 baht for 150ah. Anyone use tubular?? Other deep cycles are just a little bit more expensive than amorn in thailand.

Im planning to maintain my current system for lighting and fans. For the planned wok cooking and perhaps thay aircon i soon will buy more panels, battery and ofcourse a controller with enough amps for the future. I posted two examples videos above and if can achieve that + wok cooking i am satisfied

Don't start electric motors directly off PV only - work out a system using supplementary mains or batteries to assist with startup.

With a timer wont work also when its cloudy and the panels dont give enough voltage/watts/amps It will drain the battery. Is there a tool which works like a switch depending on the amps? Like a thermoswitch depending on the temperature but then depending on the amps.

This guy said:

Inverter directly connected with solar panels without battery?

I am using a 200w 12volt inverter directly with my 100watt solar panel connected via charge controller.

Solar panel 100w(9to 22volt) + charge controler(12volt 6amp=72watt) + (12v 200w) inverter = load

Okay charge controller is a device that we use to charge a battery directly of the solar pane

so I connected my inverter in the place of a battery it works fine bec the charge controller is a rated for 78 watts and inverter uses some power in conversion my inverter can sustain loads upto 65 watts if the panel is producing enough current.

and charges controller controls the voltage and amps and saves inverter from burning out.

I have read a lot of the internet that u can not use inverter directly with solar panel without batteries unless your inverter is a grid tie inverter I think its crap ppl dont really know what are they talking about.

However if solar panel stops producing enough current inverter might overload other then that u can run inverter directly with solar panel according to my understanding.

https://answers.yahoo.com/question/index?qid=20140608055523AAiuwlk

Here are some examples of pv panels directly connected to an inverter. I have no grid connection. Till now my house is 12volt house.

https://m.youtube.com/results?q=solar+panel+dirext+to+inverter+no+battery

@muhendis, ok...i understand.

Coming back to the favorite subject of @naam and the 260watt aircon, a question.

If all my alternative efforts to cool down during the day fail, is it possible to run that ac directly from the panels (300wp) via an inverter, thus not connecting to a controller and battery bank???

If possible, it means that the ac will run automaTicly during (hot) top peak hours and ive achived my goals. In the evening i dont need to run that ac, not even a fan is needed.

Added: Sorry double posted

@muhendis, ok....i understand.

Coming back to the favorite subject of @naam ..hehehehe...and that 260watt ac, a question.

If all my efforts fail, is it possible to run that ac with only solar panels(300wp) and an inverter. Thus, not connected to a chargrcontroller and battery bank. If possible it means that the ac will turn on auyomaticly during top peak hours, this can mean that is rather hot outside. In the evening i dont need anything, not even a fan.

This guy claims that he can run many (old models) gadgets with only 185wp panels. Im wondering if his system is not too small for all this...??????

11 mei 2009·short video describing a small solar power system that i set up at my house. it consists of twelve 1 amp solar panels (15 watts each for a total of 180 watts of power - per hour). i use it to run all lights (CFL's), fans, tv's, and stereos in the house. also the microwave, coffee maker, blender, can opener, sandwich grill, toaster, vacuum, computer and anything else i can think of. run time for lights/fans only is approx 8 hours. add in vacuuming, microwaving or toaster along with lights, tv and the fans and the run time is reduced to 4-5 hours a day. i bought solar panels, inverter (1000 watt) and killowatt meter at Harbor Freight tools, the batteries (deep cycle) from walmart and the battery cables from checker auto. total cost was about $1200 to $1300

@naam, no need a big system for my 52m house

Very soon i think ill be happy with this 300wp+300Ah bat bank system

Ive just watch this video of a solar powered cabin. A modest guy who shows what he can do with a relatively small solar system. Very nice cabin. If i later can run all the appliances he runs i will be very happy.

Thanks @muhendis...i will order it online and will give it a try.

Will update on this subject.

Permit me to ask again about batteries. Ive read about a desulfator, only about 900bht. According to the supplier you can connect it also continiously. Will it work?

FUNCTION

The High-frequency Peak Pulse delivers an electronically controlled pulse to the battery causing crystalline sulfates to dissolve back into the electrolyte and so restoring battery function and electrolyte strength regaining the batteries ability to receive charging current and deliver discharge current.

ADVANCED TECHNOLOGY

Many desulfator products use an old technology inductor design to generate the pulse to desulfate a battery. This old technology creates a harsh inductor peak that can be damaging to the battery plates.

NEW CYCLIC PULSING FUNCTION

In a similar manner to a Pulse battery charger (charge rest charge rest etc) a cyclic desulfating pulse function (pulse rest pulse rest etc) optimizes a batteries recovery process. This method of desulfation has been implemented in the new Auto Pulse Desulfator

AUTO PULSE DESULFATOR BENEFITS:

1 Increases Battery Power

2 Extends Battery Life

3 Battery Charge Faster

4 Longer Discharge

5 Prevents Sulfate Build-up

6 Reduces Evaporation

COMPETITIVE ADVANTAGES

1. Fully Automatic voltage selection. 12V 24V 36V and 48V

2 New Cyclic pulse generation method for improved capacity recovery

3 Soft Peak Pulsing

4 Auto cutoff function to prevent over discharge of battery

5. User Configurable override for manual voltage selection:

CUTOFF VOLTAGE

Display. Cutoff voltage

12V battery C12. 11.0V

24V battery. C24. 22.0V

36V battery. C36. 33.0V

48V battery. C48. 44.0V

Muhendis wrote:

A better way is to use the cold water as it naturally is from your underground source. It would need some plumbing skills and a lot of enthusiasm.

This was my simple idea in another subject. If one think logic,why not using what nature offers. @jingjoe gave also valueable tips but @naam seems to be septical about this.

Underground is colder and undeground water is cool(er). Must be a way to cool a space above the ground, not like what an aircon can offer but few degrees cooler and then using fans is and feels cooler.

If can reach 25-26 inside when its very hot at noon, im very happy. Now already the case that during the day its cooler than outside but stil not enough. I even can sprinkle my roof.

Thanks for the tips. I will try to work out something soon.

Excellent replies about cooling,wow.

Just curieus, @jingjoe,are you the same person whom i had talked about solar power somewhere else few years ago when i was running businesses in Udon? If so, if remember well you also recently have build a house in thailand. What kind of cooling strategies did you use for that house. Is it what you described above??

Some picts that ive found and they called dessert passive cooling. Do you think that undergrounds pipes really help to cool a house? And how about if i also use fans to blow the air in thr pipe under the ground which ends above the ground. In combination with exhaust fans should in theory cools a room a little bit.. ?????

Here is an example.

https://m.youtube.com/watch?v=vvz3752M60s

Yeah...sorry.... Bormachine=electric drill. The above is a very handy tool if its difficult to buy/find a dc pump. So, if you have a electric drill this can perhaps also be a backup in case your pump goes kaput.

Just youtube for examples.

About above example lm2577. I think bat will not chargr anymore at 13.6v.

There is a member from myanmar who asked where one can buy dc water pumps.

Perhaps this is also handy. A tool for a bormachine. Use this with a 12v bormachine if you are offgrid and u have a waterpump

Two in one. You havr bormachine and a waterpump

The lm2577 works also like a dc-dc inverter. Even when the panel gives 4-5 volt output is constant at "up to you" , e.g. 14v.

I connected between the panel and chargrcontroller (simple pmw), so automatic cut off when fully charge. Different is when you for example use a lm2577 with small panel upto 15wp. No chargecontroller needed cause if you install it with output e.g.13.8 volt, no more charging when the battery reach 13.8

Cause the panel is small it will do no harm to the bat,perhaps getting a little bit warm. Handy if you daily have loads. No need chargecontroller. For example outside lamps with day/night sensor.

Then i continue with my rechargeable fan with also dc input and exhaust fans with buildin solarpanel as add-ons to my passive cooling.

About passive i was inspired by this info: https://m.youtube.com/watch?v=IvCI3Q_5A8Y

Some picts of my current situation:

Hahahaha....understand.