Please you people should leave such topics for Engineers and scientists. A transformer cannot convert dc to AC and for your information they all have transformers
In addition, without an iron core, copper wound output isolation transformer in a high frequency, transformerless inverter, if the AC output monitoring circuit were to fail and a MOSFET in the H-Bridge circuit were to short to ground, a low cost high frequency inverter can send dangerous high voltage, high amperage DC current to your AC appliances which can not only damage your appliances, but can also set those appliances on fire.
to counter this one, before and after inverters you should have protections, surge protectors and some over current breakers, dont spread fear mongers here.
Low frequency inverter has more power over high frequency inverter, it has high surge power to start higher appliances like, compresser, air conditioning. Any appliances that has motor works perfectly.
LF inverter is less efficient for a same size of HF inverter. Victron has a way of dealing with that though but their inverters are way expensive. Let us consider 8kw inverter for instance, Sunsynk/Deye costs around R35000 with 5year warranty. For a similar sized Victron inverter you will need a 10kva which is about R60000.00. For Victron, you will then have to buy MPPT charger for about R15 000.00. R75 000.00 total. That is more than double for what? 10 years on Sunsynk or 15 years on Victron?
For inductive loads, you just need to size your HF inverter correctly. My inverter hardly runs at 50% load so the inverter will certainly last long. I would get a LF inverter if i was running big power tools nonstop. I would then use it only when using the tools not permanently connected.
Sorry, thats technically incorrect! There are no 'transformer less' converters. The transformers can be smaller in high-frequency inverters - but they can't be omitted. And the conversion from DC to AC is not done by any transformer - this is simply not possible! A transformer does transform the voltage of AC only - its a short on DC! Thats why you need semiconductors (Mosfets, IGBTs e.g.) for the switching in both topologies! But the difference is the frequency of switching!
There is typically only about a 2% to 3% difference in efficiency. If you are using a properly sized battery bank and solar array, this difference in efficiency should not make much of a difference.
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Great explanation Werner!
Please you people should leave such topics for Engineers and scientists. A transformer cannot convert dc to AC and for your information they all have transformers
In addition, without an iron core, copper wound output isolation transformer in a high frequency, transformerless inverter, if the AC output monitoring circuit were to fail and a MOSFET in the H-Bridge circuit were to short to ground, a low cost high frequency inverter can send dangerous high voltage, high amperage DC current to your AC appliances which can not only
damage your appliances, but can also set those appliances on fire.
to counter this one, before and after inverters you should have protections, surge protectors and some over current breakers, dont spread fear mongers here.
what the difference between low frequency square iron transformer inverter and vocation high frequency toroidal transformer?
Low frequency inverter has more power over high frequency inverter, it has high surge power to start higher appliances like, compresser, air conditioning. Any appliances that has motor works perfectly.
LF inverter is less efficient for a same size of HF inverter. Victron has a way of dealing with that though but their inverters are way expensive. Let us consider 8kw inverter for instance, Sunsynk/Deye costs around R35000 with 5year warranty. For a similar sized Victron inverter you will need a 10kva which is about R60000.00. For Victron, you will then have to buy MPPT charger for about R15 000.00. R75 000.00 total. That is more than double for what? 10 years on Sunsynk or 15 years on Victron?
For inductive loads, you just need to size your HF inverter correctly. My inverter hardly runs at 50% load so the inverter will certainly last long. I would get a LF inverter if i was running big power tools nonstop. I would then use it only when using the tools not permanently connected.
Very true indeed
Sorry, thats technically incorrect! There are no 'transformer less' converters. The transformers can be smaller in high-frequency inverters - but they can't be omitted. And the conversion from DC to AC is not done by any transformer - this is simply not possible! A transformer does transform the voltage of AC only - its a short on DC! Thats why you need semiconductors (Mosfets, IGBTs e.g.) for the switching in both topologies! But the difference is the frequency of switching!
What about efficiency...?
There is typically only about a 2% to 3% difference in efficiency. If you are using a properly sized battery bank and solar array, this difference in efficiency should not make much of a difference.