That power switch is actually 20A DIN rail circuit breaker. That transformer is autotransformer which has only primary, and thats why there is no isolation between the outputs.
I have a similar transformer. Mine runs all inputs through the auto transformer. I have run it on an inverter before to run my little welder and my house in a pinch. It actually takes the two 65v ac legs of input and makes a single leg 110v. It also makes 220v with two inverse legs and creates a functional neutral.
holy shit your drawing really help me understand how those transformer works. in theory I can take a 30amp 120v input and convert it to 240v split phase by taking that neutral and get 2 120v feeds which will give me 240v split phase. this way I can back feed the whole house at the panel
Hi, My question is if you used the 220v in switch is the output coming off a secondary winding? If it is, couldn't you disconnect the center tap. Then disconnect the output ground from the chassis and neutral of the receptacle to achieve an I.T? Regards, Jack
Hi Howard. Yes i think it would make a great inverter transformer. Here in NZ we have 220 standard. The 110 tap could be ignored and wind your own LV secondry. Its a inexpensive way to get a toroidal transformer esp a 5KVA. Id think wou would need to derate the transformer to 50% as they tend to over rate. Im keeping my eye out for a second hand one and will give it a go.
It definitely works for me. I've bought a 240VAC single phase 5kW inverter from MPP Solar about 3 year ago. The specific model was PIP-5048MG... But in the US we use a split phase 240 VAC extensively with a bonded Neutral at the Mains panel.. So I removed the 5KVA toroidal autotransformer from a step up/down that I bought for about $90 and installed it in my circuit breaker box to obtain the split phase output I needed. This DIY procedure saved me a lot of money as I could have paid $1400 !!! for such US split phase output inverter. But I paid only $650 and It's been working fine for the past 3 years without issues. The only problem I had was with the inverter grounding. It was bonded to the chassis inside the inverter with the Neutral of the single phase 240VAC output. Moreover this is a hybrid inverter that also can take the single phase grid input, being 120VAC or 240VAC. Here also the ground, the chassis and the neutral are bonded together. To prevent short circuiting in my breaker box because of the grounding issue, I decided to go totally OFF grid and carry power to my outlets without ground... I know it's unsafe, but actually this is how domestic wiring is configured all throughout Japan. However, I do plan to resolve this issue, by opening the MPP inverter and disconnecting the ground from the neutrals. Then only can I bond the ground and neutral in my breaker box. I recently bought a newer inverter that doesn't have the chassis ground and Neutral bonded inside its chassis. So it will be simpler to implement my split phase output, and this time its going to be properly grounded. Since it's another hybrid 10.2kW inverter, this time from PowMr, I bought 2 of those 5kVA step up/down transformers which I'll connect in parallel to handle twice their power. Once it's done and the system is operative, then I'll fix the MPP grounding issue. Otherwise I'll be left without power in the whole house.
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That power switch is actually 20A DIN rail circuit breaker.
That transformer is autotransformer which has only primary, and thats why there is no isolation between the outputs.
I have a similar transformer. Mine runs all inputs through the auto transformer. I have run it on an inverter before to run my little welder and my house in a pinch. It actually takes the two 65v ac legs of input and makes a single leg 110v. It also makes 220v with two inverse legs and creates a functional neutral.
holy shit your drawing really help me understand how those transformer works.
in theory I can take a 30amp 120v input and convert it to 240v split phase by taking that neutral and get 2 120v feeds which will give me 240v split phase. this way I can back feed the whole house at the panel
Why is some transformer outlet connection not correct?
If the transformer power is 2200va, what size wire is used? does it refer to input (110v -> 20A)? or does it refer to the output (220v -> 10A)?
How difficult is it to access the blue wire connection on the coil ? If you cut it there , it should give you separate windings.
Thanks for the suggestion. I'll look into that.
Hi,
My question is if you used the 220v in switch is the output coming off a secondary winding?
If it is, couldn't you disconnect the center tap. Then disconnect the output ground from the chassis and neutral of the receptacle to achieve an I.T?
Regards,
Jack
Can i use this to run my lathe 220v machine off a 120v outlet
Not enough information regarding wattage and amp. However, you can certainly try, it will trip if it doesn't work
my friends do you knows never connected a test lead between a L&B wire to the Earths
Would you recommend this transfer to work with an inverter?
I think that would be fine as long as you stayed within its power rating.
Hi Howard. Yes i think it would make a great inverter transformer. Here in NZ we have 220 standard. The 110 tap could be ignored and wind your own LV secondry. Its a inexpensive way to get a toroidal transformer esp a 5KVA. Id think wou would need to derate the transformer to 50% as they tend to over rate. Im keeping my eye out for a second hand one and will give it a go.
It definitely works for me. I've bought a 240VAC single phase 5kW inverter from MPP Solar about 3 year ago. The specific model was PIP-5048MG... But in the US we use a split phase 240 VAC extensively with a bonded Neutral at the Mains panel.. So I removed the 5KVA toroidal autotransformer from a step up/down that I bought for about $90 and installed it in my circuit breaker box to obtain the split phase output I needed. This DIY procedure saved me a lot of money as I could have paid $1400 !!! for such US split phase output inverter. But I paid only $650 and It's been working fine for the past 3 years without issues. The only problem I had was with the inverter grounding. It was bonded to the chassis inside the inverter with the Neutral of the single phase 240VAC output. Moreover this is a hybrid inverter that also can take the single phase grid input, being 120VAC or 240VAC. Here also the ground, the chassis and the neutral are bonded together. To prevent short circuiting in my breaker box because of the grounding issue, I decided to go totally OFF grid and carry power to my outlets without ground... I know it's unsafe, but actually this is how domestic wiring is configured all throughout Japan. However, I do plan to resolve this issue, by opening the MPP inverter and disconnecting the ground from the neutrals. Then only can I bond the ground and neutral in my breaker box. I recently bought a newer inverter that doesn't have the chassis ground and Neutral bonded inside its chassis. So it will be simpler to implement my split phase output, and this time its going to be properly grounded. Since it's another hybrid 10.2kW inverter, this time from PowMr, I bought 2 of those 5kVA step up/down transformers which I'll connect in parallel to handle twice their power. Once it's done and the system is operative, then I'll fix the MPP grounding issue. Otherwise I'll be left without power in the whole house.
I thought Toroidal transformers are way quieter than regular transformer
I tested this, and there is little to no sound, granted that i was using only half of its rated wattage