Guru
Joined: 02/02/2017
Location: AustraliaPosts: 1461
| Posted: 12:16am 11 Apr 2021 |
I think the combination of the 3kW with external windings is a good
way to go for moderate power builds.
You save a huge amount of time and effort.
The toroid is not 6kW for all day capable.
It's more 1kW all day with peaks to 6kW when starting motors.
My home inverter (seen above) provides for the house.
It supplies the 2.5kW heater in the dishwasher and the pool pump
(1kW) easily.
Here are the other two spare inverters. Both working.
First is the one that powered the house for a year while I built
a Madness powerboard based unit.
It uses 4 x 3 HY4008 FETS, without on-board totem pole gate drives.
(i.e. a board from Aliexpress.)
This means the IR2110 gate drive chips have their output stages exposed to
what I think are damaging voltage transients from EMI and capacitive coupling
of the FET gates. It works fine. But it's not close to how robust
the Mad board/nanoverter combo is.
next is the test victim inverter. It has 4 x 3 HY4008 FETs on a Madness 6kW
totem pole gate drive powerboard, driven by a nanoverter. This time a 2kW toroid is used.
I have had this driving a 2.5kW hot water urn and then started the 1hp compressor.
This is a solid inverter.
But it has weaknesses that have taught me a bit about builds.
e.g. the air flow is poor when I put it face UP and run it. It gets too hot too quickly. But sit it as shown and the ventilation hole is now at the top, taking warm air from the toroid away. It needs 1/2 the time running the fan when upright.
This inverter is used to try things such as one fan for both heatsink and toroid
cooling, a proper current sensor on the AC output, the serial data LCD,
how small a toroid is possible, and detail changes to nanoverter code.