Fangpusun Inverters

       I discovered Fangpusun and a look at their website and found that they sell blatant copies of well known brands from Outback, Xantrex, Steca et.al.

       In this page, we will have a look at the Fangpusun Prosine 1800i (A ripoff of the old Xantrex Prosine series inverters with the same model number).

       I don't have a 24V supply available at the moment so testing will have to wait. For now, we look at how it is built.

This is the sticker on the outside of the box.

The inverter is well packed with foam spacers all around.

The inverter itself.

Front panel display and control on left, output terminal (behind cover plate) on right.

With the cover plate removed, here is the output terminals. Only the left three are used. The other three on the right are unconnected.

The power switch and LCD display. This is detachable for use as a remote display.

Removing four corner screws and it comes off. It is connected by a 4 pin connector same as used on telephones.

Here is the plug for the umbilical cord.

With the back cover removed.. The TO-220 device appears to be a regulator.

I'm betting the DIP part is a uC of sort.

Taking a peek of the number is too much work as I would have to desolder the LCD display.

The back cover has a patch of silpad taped on it. This is to make thermal contact with the regulator on the back of the PCB.

Back panel with the input terminals, exhaust fan and nameplate.

Battery input terminals.

Do not open? hah.

Popping the top cover off. We see this.

Lots of through hole components and NO SMDs. Very large magnetics too.

The main uC is a PIC16F73

The mode selection jumpers beside the main uC.

Output filtering is massive.

There are lots of large toroidal inductors and film caps.

This forms a complex multipole filter to remove the (from looking at the parts) relatively low carrier frequency.

This vertical board appears to be the PWM control board which modulates the sine wave and controls the output high voltage H-bridge.

Output bulk caps appear to be genuine Nippon Chemi Con capacitors.

The design is serious about output noise filtering.

And more filtering just before the output terminals.

Even the input terminals have a filter sub board.

This thermistor is gunked with silicone grease.

Yes, the non hardening stuff. Made a mess when I accidentally touched it.

This part appears to be an auxiliary supply for the internal circuitry.

More Nippon Chemi Con caps all gunked up with hot melt glue.

125A ANL fuse for input protection.

The inverter is rated at 90A input current draw.

There is access for the ANL fuse screws for replacement.

I found the lugs moving and found out the two screws on the bottom are loose so I tightened them all.

One of the screws for the FET clamping bar was not tightened.

And then, I tightened it.

The smaller caps are all Samyoung branded.

Not the best but not the worst.

Main DC-DC step up transformers use copper tape windings for the primaries.

The standoffs are not all the same height.

This resulted to the PCB bending in some areas.

What do you do when the smaller caps are going to touch the bigger caps?

Keep the lead lengths long and bend them away!

A bypass cap on the negative input to chassis.

The positive side also has one.

But the solder tab is touching the chassis!

This is the unfused end! I can see a huge ball of fire when this shorts out.

Taken out for the pic. It is a 330pF 1kV cap.

This is how it should be installed so it does not turn and touch the chassis when tightened.

       Despite some QC fails, this looks to be a well designed inverter. I just suggest popping the hood and getting the internals a once over when you first get it.

       Testing for waveform, noise, idle current draw, etc to follow.

Page created and copyright R.Quan ©25 Jan 2011.