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Messages - veggie

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1
Hi All,

I'm looking for a Changfa style R175 or R180 engine. (new or used is ok)
Preferably in Canada, but USA would work also.

Veggie

2
Everything else / Re: Current limiting device
« on: May 13, 2024, 09:06:50 PM »

Thanks for the comments guys
After seeing your comments, I appears that trying the throttle the output to the inverter would waste considerable energy as heat and reduce a lot of the gains I'm trying to get with the grid tie inverter. I think I will simply leave the inverter connected to the 800 watt PV array and keep things simple.  :)
Driving these cheap Asian grid tie inverters from a battery bank generally ends up with a bunch of burned MOSFETS.

3
Everything else / Re: Current limiting device
« on: May 11, 2024, 03:02:04 PM »

CS6_owner,
This inverter has no settings. It's a small 1000 watt unit.
Just plug-and-play.
I want to limit the power going to it at 800 watts.

4
Everything else / Current limiting device
« on: May 11, 2024, 03:37:22 AM »
Can anyone help me with a recommendation for a device that can limit DC current from a battery bank to a device?
In this case the 24 volt battery bank is connected to a 1000 watt grid tie inverter.
When connected, the inverter immediately draws the full 1000 rated watts and runs at it's maximum capacity (and heat) with no restrictions for longer life or safety.
My goal is to restrict the supply current to 800 watts (33.3 amps) by installing some device between the battery and the inverter.
For low wattage circuits a light bulb can sometimes suffice, but for 800 watts, I have no idea what would work.

If a big resistor is a possible solution, I need some help sizing it.

Any recommendations or instruction ?

thanks

5
Everything else / Current limiting device
« on: May 11, 2024, 03:35:41 AM »
Oooops !

*** Duplicate ***

Deleted

6
Listeroid Engines / Re: Vibration Sensor prevents Flywheel launch
« on: May 01, 2024, 04:18:50 PM »

Hi Bruce,

450 ft. of CAT5 cable for control signals?
Is that 3.3 volt or 5 volt ?
I am surprised that there is any signal remaining at the end of that distance.
Are you boosting in any way ?

Veggie

7
Generators / Re: ST Generator Efficiency ?
« on: January 17, 2024, 07:01:10 PM »
cujet

Thanks for the numbers. All the research I have done regarding DC alternators states that the average efficiency is around 55%.
So it would seem that the ST generator is far more efficient at making power.
A difference of 30%  (85 compared to 55) is considerable.
In other words, my engine with an alternator would have to work 30% harder to make the same power as an ST head.

8
Listeroid Engines / Re: Whete to find non detergent oil in canada
« on: January 09, 2024, 07:36:33 PM »

You could just use the regular "Diesel Engine Oil" sold at Canadian Tire.
SAE 15-40 weight, or straight SAE40.
I have used them in my Lister(oid) and Changfa engines.

9
Listeroid Engines / Re: Lubrication port beside the decompression lever.
« on: December 26, 2023, 03:22:47 PM »
I have never opened my Cam oil port. If the bearing is tucked away in an upper corner of the crankcase, I wonder were it gets oil from?
The idea to divert some lubrication to this point seems like a good one. Currently, I'm fitting a pump and oil filter to the sump, so branching
 the return line and running a tube to that port would not be hard to do.

10
Listeroid Engines / Lubrication port beside the decompression lever.
« on: December 25, 2023, 04:40:40 PM »
Question regarding the little oil plug right beside the decompression lever on Lister and Listeroid engines.
Is it an access port or a lubrication port?
When are we supposed to drip oil into that plug hole ?

It looks like it would lubricate the cam bushing, but isn't that bearing splash lubricated ?

The manual says nothing bout this port  ???

11
Generators / Re: ST3 Noise and vibration
« on: December 07, 2023, 06:46:04 PM »
Veggie,  I'm surely not smart enough to help you with electrics but wanted to say I'm sure glad to see Bruce posting.
My ST15 doesnt care how the 110 loads are split but an ST-5 I have paired with a 6/1 will protest loudly if the 110  loads get nore than a little bit imbalanced

Nothing like a good electrical question to pull Bruce out of hiding  ;)
Greetings to you both, 38AC and BruceM

12
Generators / Re: ST3 Noise and vibration
« on: December 07, 2023, 03:58:55 AM »

Hi BruceM

Yes, you confirmed my understanding of neutral bonding.
ONLY one point in the system can have the neutral/ground connection.
In my case the greenhouse is off grid.

veggie

13
Generators / Re: ST3 Noise and vibration
« on: December 07, 2023, 12:35:19 AM »
@BruceM,

You nailed it ! Thanks.
I rewired to 120 volts and all noise and vibration disappeared.
If you look at the pictures above, the 4-prong 240 volt receptacle in the orange box now has two 20A, 120 volt receptacles.
Full load and still quiet. No vibration.

My house transfer switch requires split phase 240, so this generator will be mostly useless as a backup house generator.
Fortunately it powers the greenhouse 120vac electrical + heat loads, so it still has a job. ;D
Hmmmm.... time for another generator build for the house ?  ::)

Now, here's a question for you (and anyone else).
The listeroid/ST-3 will be powering a greenhouse that is not grid connected.
It's electric outlets are not connected to the house, so they are not wired to a source that has ground and neutral bonded.
The ST-3 head has a floating neutral (not bonded to ground)
When powering the greenhouse, the whole system is a floating neutral.

When using the ST heads for home service the floating neutral is desired, but for powering anything other than a house, do we bond the ground with neutral?  or not?
As a test, I made a plug which connects ground to neutral, and plugged it into the generator outlet while running. No observable change.
However, the safety aspect changed. For the better? or for the worse? I don't know.

Here's another (but similar) example:
A listeroid with ST head powering a 120 volt 75 amp (24 volt)  battery charger for a large battery bank (1900 watts). No grid connection at all.
The charger is plugged directly in to a 120 outlet on the 120VAC ST head using standard 20A 120 volt plug with L1, Neutral, and Ground prongs.
Should the ground be connected to the neutral somewhere at the origin of the power ?

cheers



14
Generators / Re: ST3 Noise and vibration
« on: December 06, 2023, 06:51:29 PM »
Thanks BruceM,

Based on your comments I will reconfigure to 120 volt as most of my loads are that voltage.
That growling/vibration is really terrible !
Wiring for 120vac should allow me to pull the full load without issue.

cheers

15
Generators / ST3 Noise and vibration
« on: December 06, 2023, 02:44:50 AM »
I spoke too soon when I installed my new ST3 head.
When I test ran the unit (unloaded) it was quiet and smooth.
Then I tested it with a balanced 240 volt ac load. Again smooth and quiet.
So I thought all was good.

Well ... today I tested it with a 1200 watt resistive space heater on one leg and only a 75 watt light on the other leg.
The growling and vibration was so bad that I thought something had broken in my system !
Terrible vibration every time I unbalanced the two legs, but just fine when the power is balanced.
A] Is this normal for an ST3 (do they need a balanced load all time) ?
B] Can it be fixed ??

Veggie

Here's some pictures.
The unit is wired for 230 volt and I am loading one leg more than the other when the vibrations and noise occurs.

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