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Messages - veggie

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1
Everything else / Re: Easy PV water heating
« on: Today at 02:54:00 PM »


I see some DIY installers using Insulated Gate Bipolar Transistor or IGBT Transistor relays.
Are these inherently better for switching higher amperage DC (say 50 amps) ?

2
Everything else / Re: Easy PV water heating
« on: Today at 02:39:35 PM »
In his book "Take back the power", the author puts forth a case for switching to a full DC grid.
Partly as a solution for to coming social issues and energy scarcity, but also as a solution for off-grid and personal grids.
One interesting project he describes (along with circuit diagrams for self-builders) is a unit which takes direct PV power and converts it to high frequency pulsed DC.
When DC is pulsed at frequencies above 120 hz, the sparking at contact points is virtually eliminated. (Less than AC at 60 hz).
He points out that this allows the direct connection of PV panels to a water tank heating element while keeping the original water tank temperature switches in the circuit.
He wires his panels in series to get ~120 volts, then passes the power through his PWM DC unit, then on to the hot water heater. (120 volt heating element)

3
Everything else / Re: Easy PV water heating
« on: May 24, 2022, 12:04:34 AM »

Bruce,

I have several of those DC-DC relays ranging from 25 to 100 amps.
I have been reluctant to use them in any critical service because they only cost $12  ???
What do you think about grossly over sizing them?
For example, if there is a solar panel supply which max's out at 25 amps, then use the 100 amp SSR for switching the element load off when target temperature is achieved.
Do you think this would give the inexpensive SSR a fighting chance at staying alive more than a few months.
(I would also recommend to everyone to use the appropriate heat sink)

4
General Discussion / Re: Forum Reorganisation - your assistance needed please!
« on: May 20, 2022, 06:38:42 PM »
 Given the current conditions regarding world energy, the Alternative Fuels section may become a bit busier soon.
So I suggest wee keep it  ;)

5
Lister Market Place (things for Sale) / Re: ST-5 5KW Generator Head FOR SALE
« on: May 19, 2022, 12:27:17 AM »
Quote from: wirenutrob on May 18, 2022, 10:55:50 PM
Do you still have that frame that you were using for your 6-1 and ST-5?
Robert

No, it sold with the engine

cheers

6
Everything else / Re: What engine?
« on: May 17, 2022, 11:36:23 PM »
Is that Chinese symbols of the valve cover ?
See if you can scrub away the rust.

7
Lister Based Generators / Re: 6/1 driving ST clone 260 VAC
« on: May 17, 2022, 11:33:15 PM »

If you want to run the lister at 650 rpm (and the ST at 1800 rpm), you need a 2.77:1 ratio belt drive.
That would give you the correct voltage.
So if you have 23" flywheels, your generator should have an 8.3" pulley.
(Assuming you are driving the generator using a belt around the flywheel)

8
Listeroid Engines / Re: My fix for Listeroid light flicker
« on: May 15, 2022, 01:10:00 AM »

Interesting Bruce,

$1000 for a 100 AMP 24 volt LFP ( or $2000 for 200 amps comparable to my current setup)

To replace my four 225 amp lead acid deep cycles, the total cost would be $800.

A huge price difference for 200 amp batteries.

Granted, a proper analysis would also include expected cycles over the life of both packs.

veggie

9
Listeroid Engines / Re: My fix for Listeroid light flicker
« on: May 14, 2022, 03:20:33 PM »
Thanks Cujet,

The weak point at the moment is the batteries. They are 9 years old.
They hold a charge and perform well (about 85% of their original performance), but their days are numbered.
I considered switching to IiFePo but I'm not sure if an alternator can charge them.
Perhaps the BMS takes care of that problem. I will need to do more research as the time gets closer.

cheers

10
Generators / Re: Solid State AVR on an ST-3 Head - Any need for it ?
« on: May 11, 2022, 03:42:36 AM »

BruceM

Excellent tips !

Thanks again,
Veggie

11
Generators / Re: Solid State AVR on an ST-3 Head - Any need for it ?
« on: May 09, 2022, 06:18:57 PM »
"The best ones have acceptable waveform and voltage regulation by the stock harmonic system, though I expect THD is still about 15%."

Thanks BruceM,
Just to be clear, do you suggest not adding and AVR until the unit is installed and the output is evaluated?
If I was lucky enough to win the lottery and get a "good one" then no mods may be required ?
(Other than the usual bearings, Junction Box, and tidying of the wiring)

Veggie

12
Generators / Solid State AVR on an ST-3 Head - Any need for it ?
« on: May 08, 2022, 11:34:00 PM »
These voltage regulators are available all over EBay and Amazon for anywhere between $10 and $30.
Are they any good?
Are they even necessary?
I would think that sine wave conditioning would be a better product to push for the ST heads.
In any case, If any users found a benefit from installing a solid state AVR on an ST heat, please pipe in.
I have an ST-3 and I'm wondering if I should add an AVR ?

By the way ... what currenty controls the voltage on my ST head ? just the engine rpm?

GB160 AVR Automatic Voltage Regulator for Brush Single Phase ST Alternator
Product description
=================================
Features:
100% brand new and high quality.
GB-160 AVR(Automatic voltage regulator) is applicable to harmonic excitation, 1 phase brush generator.
It is suitable for ST series single phase110/220VACgenerator.
Made with flame retardant and heat resisting material, stable and reliable to use.
High precision, long service life.
Specification:
Voltage regulation rate:;±1.0%
Exciting voltage: 20-100VDC
Shunt current: 10A
Package weight: 274g (approx.)
Package List:
1 * Automatic Voltage Regulator

13
Engines / Re: Oil Filtration video results
« on: May 04, 2022, 04:00:37 AM »

Thanks for filming that Powdermonkey.
Amazing what floats around in the oil of a "NEW" listeroid.
It would seem that any filter is better than nothing. Regardless of the type.

veggie

14
Listeroid Engines / Re: My fix for Listeroid light flicker
« on: May 03, 2022, 02:37:01 PM »

mikenash,

Engine/Generator --> Battery Charger --> Battery Bank --> Inverter --> Clean Power

Should work.

15
General Discussion / Re: Microcogen Site Login Difficulties
« on: April 30, 2022, 03:42:37 PM »
32coupe,

Humble suggestion.....

Your bookmark may still be directed to the old URL address.

Manually type      https://microcogen.info/        and try it.

If that works, bookmark the working page and delete the old bookmark.


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