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Home » Reader question » Reader question: Solar powered swimming pool pump in Thailand
Reader question: Solar powered swimming pool pump in Thailand
Dear readers,
Who uses a solar powered pool pump? I'm thinking of buying something like this and found something on the internet from Lorentz, a German product. This is also for sale in Thailand.
But does that also work well because these pumps are quite expensive? Because the energy in Thailand is not exactly cheap, you will earn back the pump, I thought.
I would like to know your experience with such a pump.
thanks in advance
Jac
Dear Jack,
Nice project to start using solar energy to reduce your electricity bill.
Regarding the investment in solar panels and a new swimming pool pump, that seems expensive to me. Why not just invest in solar panels?
My advice is to visit a solar panel company to find out what it costs you to generate energy equal to your average monthly consumption. You then already have a good basis to see whether a Lorentz solar pump installation is worth the investment. You will also gain insight into the energy supply by the solar panels during all months/seasons of the year.
Your consumption will be fairly constant because the pool pump runs for 6-8 hours every day, 365 days a year I assume. Depending on your current swimming pool installation, it is good to also look at the power (kW) of your pump. Also take this information to the solar panel company!
A (small) advantage of the Lorentz installation seems to me that the DC from the solar panels directly feeds the DC pump, so you don't need an inverter for this. However, the surplus of the solar panels that is not used does go back to the electricity grid via an inverter, according to info sheet Lorentz.
Incidentally, does anyone know if the electricity meter in Thailand with a rotary dial reverses the counter if solar panels supply more than you use at that moment?
By the way, do not expect that netting will take place in Thailand? Or do you?
Mrsgr, Frank.
We have had solar panels for about 3 years now. 16 panels a 340wp.
We were promised / told that we would save 3 to 4.000 baht every month on our electricity bill. Well unfortunately, it averages over a year 2500baht pm. I'm not going to write anything about decreasing meters, that's illegal. You can enter into a contract with PEA and then you will receive 1,68 baht back and you simply pay 4,3 or more per kWh. A solar-powered pump might be more efficient, I don't know.
Did they deliver 340 Wp panels?
Are you using more than you thought?
Is the angular position optimized?
Are there panels in the shade, are they dirty, affects the operation of the panels.
Do they all have their own operation controller? In that case, shadow or dirt is compensated for the overall effect.
Are all cables correctly and tightly connected?
Do you have a meter(s) to see how much is being generated? You can place a kWh meter after your inverter.
Are they mono or poly crystal panels, thought poly was better in warm areas.
After all, the operation of the panels decreases when it gets warmer, which can make a big difference.
Just look on Youtube, how many people try to cool things with self-built sprinklers.
Should ever read an article about a Dutchman in the Phil, he had made a pump on the Sterling Moss principle. The pump started working on heat from the sun. It's been a while and with the great Google and Windows 10 happening, you can't find anything anymore. Everything is hidden or ignored and you only get commercials of what you never asked for. Zum Kotzen.
He would develop it further and possibly go on the market. He pumped water from a well to his house. That saved a lot of running. Never heard from again, sorry. It's not too bad that I remember, I'm not the youngest anymore.555.
That's right what Jack said. A normal turntable kWh meter turns back in case of overproduction. If you do it without a contract with EPA/PEA, you must ensure that your meter does not roll back when the meter reading is taken. If it does, you will have major problems, especially if you do not have a contract with EPA/PEA.
Also remember that if you have a grid-tied inverter, you will not produce anything at all if the grid fails.
I have had PV modules for over ten years, with my own battery pack. In principle, I set it up as a "whole house UPS" If the grid fails, I switch to my own factory. When the batteries are full, and charging stops, I also switch to my own factory. When the batteries are discharged to the point where I have about 10 hours of electricity left, I go back to the grid. It's quite a complicated, so expensive system, but it works well.
Shortly after installation, and the resulting decrease in our electricity consumption, the PEA did not trust it, and they wanted to come and have a look. The moment I start running on my own electricity production, I disconnect our house from the grid. So nothing against the EPA rules, you can just turn off your main switch. And if you then walk around with flashlights, or provide electricity production in some other way, PEA has nothing to do with that.
Incidentally, the “infeed rate” as used by the PEA is simply very realistic. And the fact that much more is reimbursed in the Netherlands is a subsidy from the government. Of course, it makes no sense that you fill your house with solar cells, and then act as a supplier, and buy it back in the evening at the same rate that you sell for. The infrastructure you use then simply has to be paid for.
If you do it officially, so with permission from PEA, or EPA, you can only choose from a limited number of inverters, and your installation must be installed by a certified company. DIY is therefore not allowed.
So you have the option to do it yourself, and legally by means of a battery pack, which makes your system expensive. You can then provide electricity to a certain part of your house, such as your swimming pool. Depending on whether you also want to feed that if your own production stops for a while, you have to think about a safe "switch over".
Amorn sells solar pumps that work on DC. You can connect them directly to the PV modules. They just start spinning when the sun comes out. I don't know if they can replace a pool pump. I don't know much about swimming pools, but you could perhaps put such a pump in parallel with your regular pump, and if your solar pump starts producing, the regular pump will be switched off. Then you only need a relay, and an NRV with your regular pump.
Where do you get the idea that energy is expensive in Thailand? I live in a normal size house with living room, kitchen with electric fires, living room, 3 bedrooms and 2 bathrooms and pay around 1000 baht per month. I find that more cheap than expensive.
Then you probably don't have air conditioning. Because then you really won't make it with 1000 baht
I also live in a normal large house, with a swimming pool, have 4 refrigerators and 6 solar panels for 16 years. turn, I now pay 1.100 baht per month! Because during the day the PEE takes back my excess power for nothing and at night the meter runs on the refrigerators, TV, air conditioning and the light.
If you had set it up officially, you would at least have received the infeed rate back. You're lucky they didn't cut you off….
You can consider temporarily shutting down your current installation, then obtain the infeed rate according to the rules (i.e. have it done, with the installation that EPA/PEA prescribes). Once you have that, no one will look at the size of your installation anymore. Perhaps you can agree with the supplier of your installation that your current panels can be used. That saves a lot of extra work.
Good luck!, this of course hurts!
Arjen.