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Forum Index : Electronics : Inverter PF0.8 or PF1.0
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| hary Regular Member  Joined: 15/04/2019 Location: FrancePosts: 89 |
We can sometime find commercial inverter claiming they are PF1.0 or PF0.8. PF stand for Power Factor. We find some LF or HF type. Is there any advantage having a PF1.0 inverter ? I guess maybe yes when running nice complete resistive load ! But who does that, it almost never happen. You always run some inductive load like motor, or at least some switching power supply that are everywhere these days. As I'm not entirely clear with Power factor, can someone see any advantage and maybe explain that "feature" ? Have you an idea of your homemade inverter's power factor ? |
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mackoffgrid Guru  Joined: 13/03/2017 Location: AustraliaPosts: 460 |
Hary, You're right, we regularly run loads with big power factor changes. Just yesterday my ACER Notebook power supply tripped my earth leakage breaker when I turned it on. At the other end of the scale we have water pumps and power tools. Then we have the down-right nasty appliances like hair dryers. Loads That can Effect/upset Inverters I've had a chinese High Frequency inverter take out a water pump, microwave oven, fridge and power outlet in one event (the inverter died as well). Low frequency inverters like OzInverter or Tony's Warpverter are much more capable of delivering power with a wide range of power factor and other nasty traits, to the appliances we plug into them. "But" every build is different and you'll read plenty of stories on this forum. refer to this If you are shopping for inverters, without any other intelligence on particular products, take chinese vendors spec with a large grain of salt, pay more attention to kg. cheers Andrew |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
Could you be more clear please. What do you mean by "pay more attention to kg." So from what was said about HF inverter, How is it possible for HF inverter to have 5s 2x surge current ? |
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| mackoffgrid Guru Joined: 13/03/2017 Location: AustraliaPosts: 460 |
This is a simplification: Without other knowledge, a 50kg inverter is likely to better than a 15kg inverter. It shows it may have bigger transformers, bigger chokes, even more FETs. Sometimes weight is the only reliable specification. Sure HF inverters can have 5s of 2x rated current. Bigger Capacitors etc. But unless its a reputable manufacturer, do you believe it. Even with HF inverters, weight matters. Sure you can trade weight with sophisticated design, but usually weight still matters. cheers Andrew |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
I see. I was thinking to get this one : https://fr.aliexpress.com/item/EASUN-onduleur-solaire-3KVA-24-V-220-V-onduleur-hybride-onde-sinuso-dale-Pure-int-gr/3284 6428850.html?spm=a2g0w.search0104.3.18.79243eb8dszigG&ws_ab_test=searchweb0_0%2Csearchweb201602_6_10065_10068_319_10892_ 317_10696_10084_453_454_10083_10618_10304_10307_10820_10821_537_10302_536_10843_10059_10884_10887_321_322_10103%2Csearch web201603_16%2CppcSwitch_0&algo_pvid=25716e96-f076-45c8-920c-3c584b64aba9&algo_expid=25716e96-f076-45c8-920c-3c584b64aba 9-2 By the time I might be able to built a good heavy LF inverter. I'd like to be able to stick weld if needed, from it. I've seen the EGS002 can do variable frequency motor driver. So understanding how inverters works and dealing withe EGS002 or other control board would be useful for next project like brushless driver motor control board. I even seen in EGS002 datasheet that it could be used for inverter stick welder ! |
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| mackoffgrid Guru Joined: 13/03/2017 Location: AustraliaPosts: 460 |
Without knowing your particulars, are you off-grid, battery size, volts, type of panels and arrangement its hard to make any comment on hybrid inverters. Personally I prefer individual components. So standalone inverter, standalone solar controller, mains - generator charger etc. but thats me. I'd recommend you make contact with Clockmanfr on this forum. He has produced a book which may be instructive and he may give you a more local perspective. cheers Andrew |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Being able to arc weld off grid is certainly a realistic expectation. But I think you would be much better buying a modern (inexpensive Chinese) inverter welder rather than trying to use an ancient buzz box stick welder. It can probably be done, but why stress out your inverter more than necessary. Cheers, Tony. |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Hary, very few people will (I won't) copy and paste long links like you posted above when there is a simple way for you to turn them into a clickable link. Just click on the 4th icon from the left in the reply header and follow instructions. Before hitting the 'post reply' box use the 'preview post' function next to it to see if that was successful. Klaus |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
I'm on 8 LiFeYPO4 WINTSON 160Ah cell, so 24V, 160Ah. I don't have a lot of need, mainly for light and laptop and maybe a small 120W fridge. Every things is running from 24V except the fridge, one of the reason I need an inverter. I've bought this big capacity mainly to be able to run power tools and arc welding, so to be able to drain lot of current for small amount of time (480A@24V for 15 minutes is ok for me, should you see above link provided). It could be maximum of 150A for 1 hour/day in worse case with pause time in between. You weld 5 minutes, then put things together, then weld again, then run the saw 5 minutes and so on .... Concerning welder, yes the inverter welder seems the way to go as they have inrush current limiter compared to the old transformer ones that would trip my 6kVA switch. I've only 500W panel now, but could be expanded to 1500W, but as I said, I don't have that much needs now. I tried to contact Clockmanfr from its website, but I didn't have any response. |
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renewableMark Guru Joined: 09/12/2017 Location: AustraliaPosts: 1678 |
Hary, with all due respect to Clockman, that design is well out of date, much better designs are out now. Oz (who designed those boards Clockman sells) told me himself that the Mad boards were an improvement on his design. Buying a power board (which has totem drivers) from Madness and building a Nano control board (thanks again Poida) would be the best way to go. Cheers Caveman Mark Off grid eastern Melb |
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| hary Regular Member Joined: 15/04/2019 Location: FrancePosts: 89 |
Thanks you for all these information. For now, I've ordered this EGS002 based card, I think that's the same as BernandAmber started with, and I plan to use some small transformer I have from the shelve to catch my first experience. renewableMark, from your shortcuts, I'll dig in the Madness' totem drivers' power board and Poida's nano control board direction. About the subject of this thread, "is PF1.0 inverter better than PF0.8's ? " am I right that there is no advantage having a PF1.0 compared to a PF0.8 ? Or maybe, only if you run electric radiator, but in that case, you don't need a pure sine inverter, so ....what's the point of PF1.0 inverters ? |
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