Weima 3200 Generator (GenSet)

In an earlier post http://myphilippinelife.com/wiring-in-a-240v-backup-generator-in-a-swer-area/ we discussed our purchase of a Weima 3200 gasoline backup generator for our home in the rural Philippines.  The generator is made in China by Chongqing Weima Power Machine Co., Ltd.

In figuring out how to use the generator we partially disassembled it.  We share some photos below.  Now that we have used our generator intermittently for almost two years, we can say that we are happy with it.  We have had eight hour long power outages and the Weima ran with no problems.  It seems well made.  It always starts on the first pull as long as you remember to open the fuel petcock and close the choke.  The Weima seems identical to other generators sold under various name brands.

Weima WM 3200 Gasoline Generator

 

Weima WM3200 control panel open

Weima 3200 generator - end cap off

Weima 3200 generator – end cap off

This photo shows that the Weima seems well-built.  The quality of the wiring seems good and the main bearing seems of good quality.

The price was P13,000.  We bought it at New OK across from Robinson’s in Iloilo City.  I have had very good luck with New OK, but the generator has not needed any service, so far.

Comments (27) Write a comment

  1. i live in philppines built a new house were still working on it but getting there i was just looking at gen and come across your site im looking for gen for the house looks like you found the one that is right price if it go bad it can be replaced cheap lol i work on gen engine as im retired so well be going to the new ok store real soon thanks

    Reply

  2. Hi GOIloilo.
    your info. abt. the generator set up is interesting.
    May i ask how many liters of gasoline in a week are you consuming? is it noisy?
    Your generator is 3,200 watts and it runs everything in the house. Is it like the usual set up of appliances under “Meralco”
    How much would it cost if i buy the same generator you have?
    Regards

    Reply

  3. Q: What criteria did you use when deciding on an emergency backup generator?

    A: We went to our trusted supplier with the idea of buying a Honda. The dealer said don’t waste your money, buy the Weima. Weima parts cost a fraction of the cost of Honda parts. We took his advice. Now approaching two years, the Weima has been good. No repair parts needed.

    Regarding the size of the generator, we bought the biggest that we though we could reasonably lift into the back of our Innova to take to Iloilo for repairs. We are surprised that our 3,200 watt unit runs everything in the house including a 1.5HP split air con unit.

    Reply

  4. Hi all..great info..I have a question about 120/240..I have an inverter that has L1, L2 and Neutral wires coming out of it..If I put the L1 and L2 together it will equal 240 volts which is what I need in the Phils..My house only has 2 wires–a hot and a ground..so how do I transition from the 3 wires of inverter to the wire in my house–2 wires only..thks for your help Larry

    Reply

    • First of all, I am far from being expert in such issues. Are you sure it’s an inverter and not a step-down transformer? We have several such transformers. Ours have two prong USA style input and outputs. They are bought in Iloilo City which has supplies 120v to each prong for a total of 240v input. The output is 120v to two prongs. At our house the two prongs would connect to a hot wire and a ground delivering 240v. Your inverter would probably work fine in a place like Iloilo City but I don’t see how you could use it in a SWER area. I easily could be wrong. Maybe someone else will chime in.

      Reply

      • Hi..Yes it is an inverter..magnum 4448, 120/240 VAC inverter..It has three wires coming out of it..L1, L2, and Neutral..If you connect L1 and L2 you have 240 volts..If you connect L1 or L2 and neutral you have 120 volts..My place in Phils has one hot wire–240 volts and 1 ground? wire..so How do I hook the inverter up to my house system thru the sub panel box..thks larry

        Reply

  5. Pingback: Building our Philippine House – Index | My Philippine Life

  6. Bob, thanks I checked out Wiema’s website and the sickle mower might do the trick.
    Ken

    Reply

  7. Hello Bob. I’ve been a long time reader of your blog at goILOILO.com because my wife is a Filipina and we have a house and some land in Banate, Iloilo. We remodeled a guest house recently and we’re planning to remodel her parents house soon and your building blog has been a wealth of information. We’ve used a lot of your information as we’ve shopped around Iloilo for materials and ideas.
    On a slightly different topic. You do a lot of researching and hunting for places to buy hardware and machinery in Iloilo. I am looking for a Hand Tractor and a pull behind lawnmower “48inch 10 hp or more” because we have a couple of hectares to keep the grass cut and we’re getting tired of hiring local labor to cut it by hand. Do you know places in Iloilo (new or used) where I could look?
    Alternatively I can buy a pull behind mower in the states and ship it, but I’m guessing that is very expensive. Do you have information the best way to ship a 300 lb mower?
    Thanks
    Ken and Rose Jenson, (Sacramento and Banate)

    Reply

    • Ken, before we moved here we had a 150 acre farm in the US. I had a lovely Ford 4000 pulling a 5′ Bush Hog to keep some of my fields open. I do not recall seeing the Bush Hog type of mower here. Weima makes walk behind sickle mowers and there are lots of walk behind diesel tractors. There are many dealers in Iloilo City, including one right beside New OK on Ledesma across from Robinson’s. I’d check with the owner of New OK first. Seems like a good guy. The only way I could thing of shipping which would be affordable would be in a container along with your household goods. There are big tractor dealers in Iloilo. They may be able to get you a Bush Hog type mower.

      Good luck.

      Bob

      Reply

  8. hi bob ..i have been reading your blog with interest over the last couple of years…really from the time you purchased the land to build in tigbauan…..i have taken note of your machinery purchases you have made while building ……….i am married to a filipina and we plan to settle in the philippines in a couple of years time ……..as i am a contractor here in australia i have been toying with the idea of taking some of my building equipment to the philippines and starting a hire business …im sure there must be a demand …….i would appreciate your opinion .many thanks and good luck in your new home ….geoff pollock

    Reply

  9. This is a small single genset. It doesn’t have a permanent magnet. It uses DC as source for exitation, controlled by (AVR) automatic voltage regulator through “slip rings”. This exitation current produces magnet that rotates with shaft, called rotating magnet. Just like primary windings of a transformer. this magnet cut through the secondary(transformer) or the generator windings which produces the out AC volts.

    AVR regulates this DC inversely proportional with the output voltage, thus maintaining its design output voltage. It has more features like gain and sensitivity. It corrects surging and respond with varying load.

    Reply

  10. Bob,
    Generators always produce higher voltage and frequency without load, that’s normal. To make a good and acceptable adjustments, you will need between a minumum 30 % load, a 100 % is even better, a calibrated voltmeter and frequency meter. With load, adjust the frequency to 60.5 Hz then adjust the voltage to 235-240 VAC. Let it run for 10 minutes. Then remove the load. Frequency should rise up to 63 HZ and voltage might go up a bit to 244 VAC. let the engine cooldown for 5 minutes. Stop the engine. You may check it again if you like.

    Measuring Insulation resistance: 1Megohm is the minimum between load legs to the ground. Try 200K, 2M & 20M range. Should read infinity on 200K.
    Humidity will be the enemy of your generator windings. That’s in US, we recommend to our customer to exercise it weekly with load to keep the moist out. It also free up the moving parts and coat bearing with grease.

    Reply

    • Edgardo,

      Thanks for this great information. I’ll check the insulation resistance and let you know what I find. My old Metex multimeter does not have a frequency setting. Should I get a Fluke 117 which does? The manual does not give any information about setting voltage and frequency but I know they are adjustable. I’ll have to research how to change the settings. Weima tells me that the generator can be reset from 220v to 230v.

      Humidity is such a problem here. The heat and humidity make ten year old buildings look like historic monuments.

      Bob

      Reply

  11. Bob,
    Frequency has to be adjusted with 30 -75 % load. If adjusted without load it should be higher between 61-63 HZ. Even the voltage has to be higher, there’s a drop on voltage and frequency when loaded.
    Utility transmission uses transformers between substations to deal with loss or drop.

    For generator insulation, start @ 200k range, it should read infinity then go 2M range, should read 1M or higher.

    Reply

  12. Bob,
    You dont need a neutral (center tap)connected or bonded to ground. You only need it for 120 VAC.
    But if you want to check insulation resistance of your genset windings, I think I’d e-mail you how check continuity between load legs, neutral and ground. You just need to know if your looking at Ohm, kiloOhm or MegaOhm.
    a good insulation readings between ground and one of the load legs should be no less than 1 MegaOhm. Continuity Between 2 load legs between 1-20 ohms, between neutral and load leg L1 Plus neutral and load leg L2 should sum up to L1 & L2.
    But you shouldn’t have to do. You need to disconnect quite a few leads to isolate some circuitry so it won’t back to loops and gives you a false reading.
    I’m more concern with frequency or Hertz. The model specs said 50/60 HZ, that kinda bothers me. Do you have a Freq or HZ function on your meter? I remember when I was in Scotland
    They have 240 VAC 50 HZ, just like Japan. I shipped my household from US, including an American washing machine and Dryer. 240 to 120 VAC step down transformer wasn’t enough,
    because of the cycle/frequency/hertz.

    Reply

    • Edgardo,

      My multimeter ohm measurement settings are 200, 2K, 20K, 200K, 2M and 20M. I don’t have a frequency meter but the dealer checked and adjusted the frequency to 60HZ as part of the setup. Weima says that all of the generators shipped to the Philippines are 220v/60HZ. They also said the AVR could be adjusted to produce 230v rather than 220v. That would be good as our utility seems to provide 235v or more.

      Bob

      Reply

  13. HI Bob.

    Its a alternating generator isnt it. ?? (AC)
    So if the 2 coils is in series and in phase it will produce 164 + 56 volt, no matter the ground connection in the middle of the coil.

    So run it and measure the voltage between the 2 live terminals. if its 220 to 240 volt, then the coils are in phase.

    If the ground connection is grounded internal, that is a problem of its own, as then the whole generator has a potential to its own frame and the ground you may establish
    on one the terminals of the net.

    If not, then next thing is, does the generator data say anything about the insulation resistance from coil to frame. If it is up to normal standard its 1500 volt from the live coil to ground, and then a higher voltage to ground as 164 volt wont be a problem.

    So please check these things, and let me know the result.

    John Thede

    Reply

    • John,

      Good to have you in this discussion. Did you see the earlier post about the generator at http:///wiring-in-a-240v-backup-generator-in-a-swer-area/

      Yes, it’s an AC generator. The output measured using the load and neutral is 220v. There does not seem to be any bond between ground and neutral at the generator. The ground wire just connects the generator case to the ground terminal on the control panel. I have the unit well grounded to the rebar in my garage. When the transfer switch is in the “Utility” position the ground and neutral are connected in the panel box but when the transfer switch is in the “Generator” position there is no neutral to ground bond at either the panel box or the generator. I guess that’s because in the “Generator”position the neutral is carrying part of the load from the generator to the house wiring. All this is a bit over my head.

      I don’t know how to check the insulation resistance.

      I can just add that the set-up developed by Andrew Archibald seems in practice to work well. The only thing I noticed is the ceiling fans turned more slowly and the microwave oven was dimmer but maybe that’s just because the generator is providing 220v whereas the utility provides 235 to 240v. All else seems to run fine on the generator; water pump,lighting and refrigerator. Those are the things we really want to generator to power.

      Regards,

      Bob

      Reply

      • From John Thede:

        HI Bob.

        The remarks about the AC was just to state fact, as that was essential to understand the next coming infoes. A generator is 1 or 3 set of coil, and a rotating magnet. 3 coils and you have 3 lines, where the ends of the coils is connected together, and the center point is then grounded.

        Your generator could principiel have 2 set of coils, not placed in the same physical position, and the voltage from each coild would then not be in phase, as the magnet pass the individual coil with time difference. But as you can measure 220 volt, they are on the same pole, and in phase. Its not unusual, that generator manufacturers make on major coil, and a number of smaller coils on the same pole, so that its possible to correct the voltage output, by connecting to a suitable output point on the coils.

        So next, 110 Volt is from the fact, that 45 mA through the heart is deadly. And its considerer to be equal to 65 Volt across the heart, or said in other words, between left arm and right arm. This lead to 2 x 65 volt, where the middle point is then grounded. This way no live line will have more that 65 volt to ground, and is therefor considered to be a safe voltage to use. 2 x 65 = 110 volt. But its far too low to be used in many Aplications, as the current goes up when ever voltage goes down, so 220 – 240 Volt is better, and then the deadly current must then be dealt with in another way. The High efficient current fault relay, that cuts out when it measures a leak on 30 mA.

        In Europe, all electric equipment from 0 to 1000 volt is covered by one regulativ. All equipment that comes here must deal with this regulative, and say a Chineese generator like this must then be CE marked, and a conformaty declaration done. 1 part of this is the test voltage the generator must be able to take without damage. It means that the electric insulation on the vindings must be able to take a high voltage without burning through, or a faulty spark from live wire to ground. That is why I asked if there was a test result with the maschine or testvoltage was written on the generator label.

        The magnification of the generator can be done by permanent magnets, or by coils, which you then can adjust the generating voltage on, meaning, if you adjust the magnifying up, then the voltage goes up on the live wires.

        Do you know if your generator is with permanent magnets, or electric magnification??

        Yaa, about the voltage drop, especially on glow bulbs, its visible if the voltage goes low, but flourescent lamps isnt that way, as they have a coil in series that adjust the burning voltage.

        The ground connection is for safety person only, and never for leading current. The purpose is only to remove dangerous voltage from a maschine surface, and secure fault current is lead to ground and back to the suplier.

        I hope I got most of it here, but else, just ask.

        Regards from John

        Reply

  14. Buying a Genset from US and shipping it to PHILS is not a bad idea, until it needs repair and parts. It is true that most gensets look identical due to copy cat Mfrs, parts are
    not the same and interchageable. I was in the military for 24 years and been a field service tech for cummins for over 13 years. I’ve seen a lot of generators. US companies did or still do, assemble engines, generators, regulators and controls and sell it as one unit. Generac, coleman to name a few. I’m presently troubleshooting a DMT genset under a bridge. It has a cummins engine, a stamford generator and DMT configured control. DMT no longer exist, getting info on this unit is a challenge. I was going to bring an H3 (Hummer) or Jeep wrangler to PHILS but changed my mind. I’ll get one locally.
    Bob got it right.

    The reason I drew a ground symbol on center tap of figure 1 & L2 on figure 2 above, is due Reference requirement that if a genset supplies a building, neutral has to be bonded to ground.

    Reply

    • We really felt that it was key to have good repair and parts availability. We had had such good luck with New OK Marketing in Iloilo on our previous purchases (cement mixer, concrete vibrator, water pump) that we went to them and asked for their advice. New OK sells lots and lots of generators. I asked about a Honda and they said don’t waste your money. The equivalent Honda was almost P40,000 while the Weima was P13,000. He said he had sold 450 Weimas, that they were easy to fix and that parts were cheap and available. As I recall it he said an AVR module for Honda was about P3,000 whereas for the Weima was P700.

      We followed the same philosophy when we bought our basic Toyota Innova in 2008. It’s the best selling vehicle in the Philippines and the Iloilo Toyota dealer seems to be a class act.

      Reply

  15. Most generator sets bought here in the states are made in China. I bought a McCulloch FG5700AK and guess where it was built. Most equipment is made by 2 or3 companys now days and everyone buys from the manufacture and puts their names on them. This is why you look at a few brand name equipment and they look the same but have different bells and whistles. I bought mine for $ 350.00 and getting ready to ship door to door.

    Reply

  16. Why not just buy a troy bilt, or another usa brand and have it shipped over by shipper umac??? i bought a 5500 and plan to have it shipped just prior to us moving to phil.. just a thot… if you need assistance, we can help with having a box taken to umac….

    Reply

    • Kenneth,

      Thank you for the offer. I just don’t see how an American brand 240/120 generator would help. Our problem is not so much the generator, but rather the type of electrical service we have. Actually the Weima seems pretty well made. I suspect that they make gensets which are sold under other brands. I was looking at Cummins models and the similarity to our Weima is too close to be accidental.

      Bob

      Reply

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