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Re: Has anyone hacked or examined schematics for Inverter/Generator?

Discussion Board - Wed, 01/18/2017 - 20:55
Not quite on topic but associated with switching high voltage DC, I'm planning on regulating my AC coupled grid tie outputs by switching the solar panel inputs on/off in 2.5kw increments.

This may not at first sight look to be a good idea!! but I have...

Re: Has anyone hacked or examined schematics for Inverter/Generator?

Discussion Board - Wed, 01/18/2017 - 19:32
I've worked with 800VDC & unlimited amperage. Umnn, letsee... never speak of HVDC in the wild as you would in a laboratory setting.

The converted inverter generator would not be in a clean room fire proof room, it'd be around people, children, animals...

Re: Has anyone hacked or examined schematics for Inverter/Generator?

Discussion Board - Wed, 01/18/2017 - 16:03
There are two main things to worry about with high voltage dc.
The greatly  increased lethality,  and huge dc arcs generated by the opening of switch or relay contacts.

My system uses two dc bus voltages +230v dc and -230v dc that run either side of m...

Re: Low Cost Power Point Controller, Linear Current Booster

Discussion Board - Wed, 01/18/2017 - 15:47
Not sure of your question.  This is one of the few small buck converters I can recommend as sturdy enough for battery charging.  At $4, two could be used in parallel with a little modification for higher current.   These do have current limiting but th...

Re: Low Cost Power Point Controller, Linear Current Booster

Discussion Board - Wed, 01/18/2017 - 15:40
It can in theory be added to just about any type of  battery controller, but with the proviso that any negative feedback around a control loop must be slow enough to be made stable.
A typical battery charger controller has two separate feedback loops.

...

Re: Has anyone hacked or examined schematics for Inverter/Generator?

Discussion Board - Wed, 01/18/2017 - 15:02
400 volts is not bad at all and not to hard to deal with. The wire insulation will handle it if you use 600 volt rated wire and you don't need any special potting etc. I have built 2,500 volt 1 amp power supplies and never used any special potting. Des...

Re: Low Cost Power Point Controller, Linear Current Booster

Discussion Board - Wed, 01/18/2017 - 14:13
Thanks for sharing this.
Could this controller work for a simple battery charge controller, I was thinking NO but possibly would at one fixed voltage. If not, what type of charge controller would be needed?

Re: Has anyone hacked or examined schematics for Inverter/Generator?

Discussion Board - Wed, 01/18/2017 - 11:39
Way back I glommed onto a Eu3000 shop manual with the point to point troubleshooting procedures just for the curiosity of  investigating multi-purpose inverter built in/around a Honda inverter generator...

360-400V DC is not something to be casual wit...

Re: Low Cost Power Point Controller, Linear Current Booster

Discussion Board - Wed, 01/18/2017 - 10:05
If you need more logic options, controlling this buck converter can be done with a UNO.
I used the PWM output of pin #5 because it is at a higher frequency of 960Hz which makes
it easier to filter. This pin feeds a 750 ohm resistor to a 220uF cap which...

Re: Has anyone hacked or examined schematics for Inverter/Generator?

Discussion Board - Wed, 01/18/2017 - 01:33
I've been looking for one of these inverter generators for a while with a defective inverter.  I just imagine they use some hybrid parts that make them uneconomical to repair after they are out of warranty. I would then just use the  DC power and feed ...

Re: DIY Air resistive loads?

Discussion Board - Wed, 01/18/2017 - 00:42
Don't forget about aluminium clad resistors, available from e-bay.
The Chinese ones are not now that expensive, and available rated to several hundred watts.
Main advantage is you can get pretty close to any resistance value you need, or can get even c...

Re: DIY Air resistive loads?

Discussion Board - Tue, 01/17/2017 - 23:35
i actually used them as resistors once.

a 22mOhm mosfet is cheaper than a 22mOhm resistor in the same TO-220 heatsinkable package. the application i needed did not care about thermal coefficient, which as you know for silicon varies by an order of mag...

Re: DIY Air resistive loads?

Discussion Board - Tue, 01/17/2017 - 22:35
I know this is not exactly what the topic requested, but why not use MOSFET's as the Dump Load Resistors.  They are cheaper.  You can get a couple of 300W MOSFETs for around $5.  They would need to be mounted on heat sinks.  The bigger the heat sink, t...

Re: Cabin tour video

Discussion Board - Tue, 01/17/2017 - 18:21
Nice location! Bet the hunting is awesome. Propane is a pain below -20f. I rented a farmhouse with a propane furnace and several times I had to heat the regulator with a hair dryer to get things flowing when it dropped to -27 that winter. Only rented t...

Re: Has anyone hacked or examined schematics for Inverter/Generator?

Discussion Board - Tue, 01/17/2017 - 17:04
I have never seen this anywhere else either, but its an excellent idea.

Doing it all at high dc voltage and low current means the efficiency will be very high.

I am doing something similar with a mains transformer rectifier, to generate a high dc volta...

Re: Low Cost Power Point Controller, Linear Current Booster

Discussion Board - Tue, 01/17/2017 - 16:45
This is an excellent idea, and a great writeup by Opera House.
A great deal of thought has obviously gone into developing this circuit.

I have been using a similar method of control in my own home built solar controller, although my own circuit is very...

Re: Cabin tour video

Discussion Board - Tue, 01/17/2017 - 16:42
i had full intentions of recording a bunch of videos on how all the different systems  functioned at the cabin last weekend.  But it was the first night with the new propane stove in the addition. The regulator froze up.  And killed my motivation.  Lol...

Re: Solar Panel give away

Discussion Board - Tue, 01/17/2017 - 14:24
My son had a pallet load ( 130 panels )shipped from Miami to Idaho, turned out to be $6 ea. There is a minimum $2.50 ea shipping to get them from wherever to Miami for distribution. Only saw one with broken glass, a little dinged up and scuffed from be...

Re: Cabin tour video

Discussion Board - Tue, 01/17/2017 - 13:11
Waiting to see the energy side.  Best fire starter ever is shredded paper (those one inch crinkled types) mixed in a tub of melted candle wax. Long slow burn that starts even damp wood.

Low Cost Power Point Controller, Linear Current Booster

Discussion Board - Tue, 01/17/2017 - 11:19
   Low Cost Power Point Controller, Linear Current Booster

This is an update on the simple Power Point controller proposed a few years ago. Using this
300W 40V 8A ebay buck converter, a decent 5A charge controller can be built suitable for small
appli...
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