Solar power setup for your home in Thailand

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buksida
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Re: Solar power setup for your home in Thailand

Post by buksida » Tue Oct 31, 2017 8:37 am

Cheers, will drop them an email and see what they suggest.

I've tried those cheapo Chinese ones on Lazada and they're useless (broken within a month) unless you're willing to spend tens of thousands ...
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Re: Solar power setup for your home in Thailand

Post by StevePIraq » Tue Oct 31, 2017 4:16 pm

RCer wrote:
Mon Sep 11, 2017 5:30 pm
Solar is a perfect idea for Thailand. Only question in my mind, will the roof on the average village home support it?
Really, when electricity is so cheap here. Car battieries last a few years tops so how long with battery packs last.
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Re: Solar power setup for your home in Thailand

Post by buksida » Sat Nov 11, 2017 9:57 am

Not a lot of response from that company, probably because I'm not spending a fortune. :roll:

So can any of you solar/electrics gurus knock up a spec and round cost for panels to power a 90w pump that shifts 4000 liters per hour? Obviously I'd have to buy a DC pump as it would be cheaper than the inverter. It would run during the day and stop at night so no batteries required.
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Re: Solar power setup for your home in Thailand

Post by Nereus » Sat Nov 11, 2017 12:53 pm

It is not really practical to run anything, pump or otherwise, direct from a solar panel. The output varies too much with varying levels of sunlight, so a battery is necessary to provide a stable supply.

Not sure how you arrived at the pump requirement? Although it is just a simple pond that you want to use it on, the wattage required to drive a pump depends on several variable factors. The usual way is to work out both the suction and discharge "head" to arrive at the required flow, and hence the power required. If it is a submersible pump, then it is mostly the discharge head, which accumulates higher depending on pipe size, filter restriction, etc.

Your 90 watts at 12 Volts, disregarding losses', equates to 7.5 amps, but that is at full load, so it may well be less.
A common misconception with centrifugal type pumps is that the load will be less if the discharge has no restriction,
i.e.: it is open ended. In fact, if the flow rate is reduced, then the "work" required is less, so the pump will draw less amps. To reduce the amps draw it would need a small valve on the discharge side to throttle in the flow.

Solar panels are like everything else: you get what you pay for. Lazada has 50 watt panels for around 2,000 Baht, where the commercial suppliers are asking between 5,000 / 6,000 Baht per panel.

The supply of a 12 volt pump may also prove to be a problem. There are marine bilge pumps available that are good quality, but be aware that most of them are not rated for continuous use, even if it is just 12 hours a day.

All this adds up to why the al cheapo pond pumps from Lazada do not last very long. If you want a reliable system then there is no way around paying more.

You have posted previously complaining about the unreliable and iffy mains supply where you are. In the long term it may be a better option to pay a bit more and set up a system that you can also at least use for your computers and other electronic systems, and then run a small 240 volt pump from that. Some of the higher rated(2 / 3,000 watt) Chinese inverters have come down in price, but be aware that you will have to buy some good deep cycle batteries. If you go for 24 Volts it makes it a lot more attractive, as only 2 batteries are needed. Also halves the wire size requirement on the primary side. Have not bought any but I have seen them advertised for around 4/5,000 Baht each. Looked after they will last many years.
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Re: Solar power setup for your home in Thailand

Post by Nereus » Sat Nov 11, 2017 1:39 pm

The following may be of use. They have been in the electronics business for a long time.

http://www.amornsolar.com/en/index.php
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Re: Solar power setup for your home in Thailand

Post by buksida » Sat Nov 11, 2017 1:49 pm

Thanks for that, yes a lot of info there - the pump calculation was done for the volume of water and Koi carp that like it clean, there was a certain flow rate through the filter that it needed. The a/c pump cost 1,600 and does the job fine - just thought an eco-solution would be better.

You're not wrong on the power problems, the local transformer explodes twice a week, the last one a few days ago blew our shower heater up. Fortunately I did some tests and found it was the earth leakage breaker so 500 baht to change that instead of 6,500 on a new unit. Shit fries on a weekly basis where we live.
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Re: Solar power setup for your home in Thailand

Post by Nereus » Thu Jun 07, 2018 10:38 am

It has to be asked just how long it will take the "authorities" and their connections to make some pocket money out of this. If they would only take their face saving attitude and hide it away, all of the research, technical requirements, pitfalls, equipment etc., are freely available from other countries. But as usual, the first thought will be how much money can be siphoned off, rather than all the advantages to be had. :cuss:
…………………………………………………………………………………………………………………………………………………...
Private solar power buying gets go-ahead

https://www.bangkokpost.com/business/ne ... recent_box

Energy policymakers gave the green light to start buying solar power generated from private buildings and households once again after postponing the programme for more than four years.

Private buildings and households that are accepted by the programme will sell surplus solar power to the state's utilities.

Energy Minister Siri Jirapongphan said the Department of Alternative Energy Development and Efficiency is carrying out studies to outline the investment conditions, which are expected to be concluded this year.
He said there is no solid time frame yet because details such as business model, investment budget, power tariff, net metering system, supporting region and capacity from each building are still under development.

The tightened condition is the power tariff to sell back should be up to 2.44 baht per kilowatt-hour.

Mr Siri said policymakers are confident that the cost to develop rooftop solar photovoltaic panels has declined.
The programme will allow for households to sell power either under a business-to-business model or to sell surplus electricity wholesale to the state.

"We are working to support households to participate in the power generation from their own rooftops and to receive revenue from selling the surplus electricity," Mr Siri said.

This programme is aimed at achieving policymakers' goal to have all types of renewable energy make up 30% of the country's total power generation by 2036 from 10% at present.

The policymaker expects to see a decline in heavy dependence on fossil-based power in the long run. Fossil fuels make up 85% of national power.

Mr Siri said the programme may be accelerated to increase the proportion of renewable energy and meet the target sooner than projected.

Biomass and biogas are becoming mainstream energy sources, with combined capacity of more than 3,000 megawatts.
The rooftop programme was launched for the first time in 2013 with a total quota of 200MW.

Bangkok, Nonthaburi and Samut Prakan were allocated 80MW of the total, equally distributed between private buildings and households.

At the time, the power tariff was set at 6.10-6.96 baht per kilowatt-hour, higher than for the upcoming programme.
Since then, the programme has faced political conflicts and has not been promoted, leaving huge solar power projects of 2,000MW pending during 2014-16.

Somruedee Chaimongkol, director of Banpu Infinergy Co, a solar energy provider, said the company welcomes the programme and is ready to comply once the investment conditions have been made clearer.

She said the company is confident the current power tariff is competitive and fair, relative to its business partnerships with smart energy service providers.

The company provides a combined capacity of 12MW and has another 100MW in its backlog.

Banpu Infinergy is also set to achieve 300MW of capacity from solar energy to serve future demand in accordance with the Energy Ministry's Alternative Energy Development Plan

Solar rooftop owners operate as independent power suppliers (IPSs). The Energy Regulatory Commission reported that registered IPSs have a combined capacity of 2,600MW and more new IPSs are being launched each month with an average capacity of 4-5MW.

IPS capacity accounts for 6.5% of the total power generation system.
May you be in heaven half an hour before the devil know`s you`re dead!

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