Water pump, inverter?
- Thread starter Jeppe
- Start date
Yorky
Fullritis Member
OK, that's the same as my system. I really don't know that much about inverter pumps (didn't have them when I was a lad) but I understand that they are electronically controlled thereby conserving electricity and also the integrity of the unit. I believe that there are others on here who may be able to advise you. What is the difference in cost for similar output units?
Jeppe
Surin Legend
I was just at Thai Watsadu and looking for a pump with 200-250W. There they only had a Hitachi 400W inverter pump for 14000 thb. I guess a Hitachi 400W on/off pump will cost around 10 000. So they are some more expensive. I will go to Home Pro and check there tomorrow.
Yorky
Fullritis Member
I bought my Hitachi from IQ Moderntrade but it was many years ago. 19mm inlet/outlet for about Bht 6,000.00. It's been "serviced" once which entailed removing a termite's nest.
nomad97
Resident Geek
I am using a Hitachi GX 250 series (shallow well) and very happy with it. Having read Hitachi's brochures perhaps the XS series would have been more appropriate. The XS series is designed for the top diagram:
My GX 250 runs very well (5 years old) and provides more than enough pressure for the house, washing machine, showers and garden.
The equivalent XS 250 series (same shape and size as my GS 250) is advertised by HomePro and sells for 7,100 baht.
or
In fact, looking at the HomePro website they only sell the XS version of the pump. https://www.homepro.co.th/category/12174
P.S.. My model design is the circular version on the left.
My GX 250 runs very well (5 years old) and provides more than enough pressure for the house, washing machine, showers and garden.
The equivalent XS 250 series (same shape and size as my GS 250) is advertised by HomePro and sells for 7,100 baht.
In fact, looking at the HomePro website they only sell the XS version of the pump. https://www.homepro.co.th/category/12174
P.S.. My model design is the circular version on the left.
Last edited:
gotlost
Kap Chong R Us Member
Your correct on that 10k as we have a unit 9.5k from Home Pro. FWIW Give Global House a look as they normally beat Home Pro and its amazing what GH has that GH doesn't. Also as Yorky pointed out take a look at IQ they also can have some good kit.
nomad97
Resident Geek
I think the GS 250 series is more than powerful enough for your home and only 7,100 baht. If you would like to see mine come on round.
Rice
Resident Smart Arse
You guys are missing the question of, and the and point of the OP. Here it is, wait no longer.
Pros of an inverter.
Less power usage, No brushes on the motor to wear out, regulates speed in regard to maintain constant pressure. They are quiet as they use a DC motor.
Cons.
The electronics that it relies on may blow up in the first lightning strike. They are more expensive then the conventional ones. You can make this up with power savings though.
Pros of an inverter.
Less power usage, No brushes on the motor to wear out, regulates speed in regard to maintain constant pressure. They are quiet as they use a DC motor.
Cons.
The electronics that it relies on may blow up in the first lightning strike. They are more expensive then the conventional ones. You can make this up with power savings though.
gotlost
Kap Chong R Us Member
You are correct on great one.
The question being does the OP want to spend an extra 5K. As I said look about because HP is not the cheapest place about.
Yorky
Fullritis Member
I only am aware of what I have read about inverters. But I think what needed to be established first is where the pump is going to be installed in the system and for what precise purpose. After establishing those facts, I pass it over to those more knowledgeable.
Yorky
Fullritis Member
I have the system described in the top diagram together with a XS series pump (the square one).
nomad97
Resident Geek
I hear what you say Oh Great One but I ducked the question because I didn't know the answer. I do question your last point about cost savings. Yes, I know they are cheaper to run but how long would it take to amortize costs? A 7,000 baht differential may take several years to recoup the extra cost. By which time it may well have blown circuits and need replacing due to the frequency of lightning strikes in this area during the summer months.
Yorky
Fullritis Member
Reminds me of Kevin (bless him) who bought a petrol engined Fortuna thereby saving c. Bht 100,000.00 over the diesel model. Given that he was covering an average of 600 - 700 km/week I don't think that he had given it much thought. Anyway, he probably died before it amortised costs (correct spelling).
Yorky
Fullritis Member
A question @Rice :
My neighbour did not heed my advice and decided to pump from the mains to a high level storage tank. I explained that there was insufficient pressure/flow in the mains to feed a pump during daytime but he was adamant and went his own way. From my limited experience of centrifugal pumps in this situation they could cavitate and possibly destroy the impeller.
Could these "inverter" pumps be potentially liable to the same fate?
Deerculler
Surin relic
I am using a Hitachi GX 250 series (shallow well) and very happy with it. Having read Hitachi's brochures perhaps the XS series would have been more appropriate. The XS series is designed for the top diagram:
View attachment 20193
My GX 250 runs very well (5 years old) and provides more than enough pressure for the house, washing machine, showers and garden.
The equivalent XS 250 series (same shape and size as my GS 250) is advertised by HomePro and sells for 7,100 baht.
or
In fact, looking at the HomePro website they only sell the XS version of the pump. https://www.homepro.co.th/category/12174
P.S.. My model design is the circular version on the left.
Rice
Resident Smart Arse
My thoughts exactly. Should of said you may make up the price in savings. They do state that there can be up to a 40% power saving on a conventional unit. So if that was true, Fork nose how long it would take to amortise the price differential. I will leave it to the budgeting guru Yorky to figure it out.
On your question Yorky the inverter is running the power for the impeller that where it ends, a pump is still a pump and can suffer from cavitation. So your neighbor was trying to suck water out of the thin mains pipe faster then it would normally arrive. Now that is a recipe for cavitation as it would set up a severe turbulence trying to create a vacuum force, so in a word you are correct in your thinking.
Yorky
Fullritis Member
In order to assess any overall saving or loss one would need to know the volume of water being pumped during a specific period, i.e. for how long the pumps are operating. Whatever, it will not be an easy straightforward calculation.
Rice
Resident Smart Arse
Make a basket of assumptions and see what you get.