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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