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Murphy's friend Guru Joined: 04/10/2019 Location: AustraliaPosts: 648
Posted: 10:35am 07 Nov 2022
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Why skinny? It's for my caravan and has to fit into a narrow tunnel booth next to the 24V lithium batteries.
The following pictures show the building progress:
The last picture shows the inverter inside the tight confines of that tunnel booth.
Some statistics:
Standby power OFF = 2W Standby power ON = 10W
Running power: 1.2KW all day, 1.5KW with a slight sinewave peak distortion.
Surge power, who knows? It certainly starts and runs the A/C (850W running) and the microwave (1KW running). Both of those did not start with the van's 1.2KW (2.4KW surge) High frequency inverter. Nor did they start with my 1.8KW (2.4KW surge) generator providing AC power.
Size is 180mm W x 495mm L x 350mm H and it weighs a hefty 25Kg.
All my inverters run with two half bridge PCB's and opto isolated totem pole final drivers. I found that using several smaller boards is actually cheaper than two large PCB's. 2oz PCB's are used only for the small mosfet carry boards.
Revlac Guru Joined: 31/12/2016 Location: AustraliaPosts: 1024
Posted: 10:33am 09 Nov 2022
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Looks good Murph, nice low power consumption. Cheers Aaron Off The Grid
Alston Regular Member Joined: 04/04/2021 Location: AustraliaPosts: 63
Posted: 11:29am 09 Nov 2022
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That turned out great! A nice compact design.
analog8484 Senior Member Joined: 11/11/2021 Location: United StatesPosts: 108
Posted: 07:05pm 09 Nov 2022
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Looks great. What's the approximate weight and dimensions?
Murphy's friend Guru Joined: 04/10/2019 Location: AustraliaPosts: 648
Posted: 09:41am 10 Nov 2022
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Thanks, if you read the last lines of my post, your question is answered there.
Murphy's friend Guru Joined: 04/10/2019 Location: AustraliaPosts: 648
Posted: 09:48am 10 Nov 2022
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Thanks Aaron, I followed warpspeeds 1 Tesla (10,000 Gauss)flux toroid winding suggestion. That 2 Watt is mostly consumed by the LED's of the temperature fan controller on top. Another relay that turns that on only when the inverter is running would fix it , thought about that afterwards but will first see how it goes in the caravan.
Murphy's friend Guru Joined: 04/10/2019 Location: AustraliaPosts: 648
Posted: 09:50am 10 Nov 2022
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Thanks Paul, now let's see if you can make your warpverter that small
Alston Regular Member Joined: 04/04/2021 Location: AustraliaPosts: 63
Posted: 11:47am 11 Nov 2022
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Not unless I make a really low wattage one! It's actually going to be slightly (~100mm wider) than yours which is annoying as it means I can't use your idea of the the Aerosharp lids.
How did you find winding the Altronics cable on this transformer?
Murphy's friend Guru Joined: 04/10/2019 Location: AustraliaPosts: 648
Posted: 02:10pm 11 Nov 2022
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If I could use those lids so can you, just stack those transformers differently , it just gets a bit taller instead.
Those black cables wound OK, just the right hole room for one layer of two in hand cable. A lot easier to wind than one fat cable would have been.
analog8484 Senior Member Joined: 11/11/2021 Location: United StatesPosts: 108
Posted: 06:56pm 12 Nov 2022
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Thanks. Somehow I missed that. It's heavier than I would have guessed for a 1200W continuous LF inverter. How much of the weight is the transformer?
Murphy's friend Guru Joined: 04/10/2019 Location: AustraliaPosts: 648
Posted: 08:37am 13 Nov 2022
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Don't know exactly but it's around 3/4 of the total. There's no way around that if one wants grunt with the power. And I mean grunt for more than the 1/2 cycle those HF inverters are capable of.
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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, thought about that afterwards but will first see how it goes in the caravan. 
It's actually going to be slightly (~100mm wider) than yours which is annoying as it means I can't use your idea of the the Aerosharp lids.