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Author Topic: Grid Hopping  (Read 87473 times)
Robl
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« Reply #15 on: July 14, 2015, 07:11:34 PM »



One shot drain cleaner from b&q is 91% sulphuric.  Add acid to water to dilute, and I always wear safety glasses and gloves.  I used it for anodising a home made bike light some time back, worked well, bike now nicked though😩
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Tinbum
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« Reply #16 on: July 14, 2015, 08:58:13 PM »

I got mine from here;

http://www.trinity-research.co.uk/index.php?cPath=21_96_23_106_35&osCsid=1qkakl6ju2820h84h33oi0vgn7
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biff
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« Reply #17 on: August 07, 2015, 10:06:50 AM »

That is one neat job Scruff,
                         I did similar with the flat copper pipe but not half as neat as that and yours is safe and by the book.
             In fact, You have shown me how to do it properly. Thank you. I have the bits and bobs so I will get cracking on a pair before long
                                                           Biff
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todthedog
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« Reply #18 on: September 08, 2015, 08:09:50 PM »

I've put on a hat so I can doff it in your direction!
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Kidwelly South Wales
biff
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« Reply #19 on: September 08, 2015, 09:51:40 PM »

Good pics Scruff,
                  I am just getting my head around them. I gather that the mosfet on the bottom right of the last pic is the blown one, ?
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jonesy
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« Reply #20 on: September 09, 2015, 11:25:48 AM »

Manufacturers will sometimes invert the rs232 (at TTL) so a normal usb/ttl won't work.  With a DVM check the TX line.  Should be +5 at idle.
The other thing to check is the board logic level.  If the chips a 3v3, avoid a 5v converter as this can toast the board.
I got my SMA converter schematic from hi-res pictures that showed all the chip numbers and both sides of the board.
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skyewright
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« Reply #21 on: September 09, 2015, 02:16:47 PM »

What's a 3v3?
Another way of writing 3.3V, I believe.
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David
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Mostie
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« Reply #22 on: September 09, 2015, 05:49:18 PM »

Mr Scruff, not sure if this helps but here's a ttl for 3.3 or 5v
http://picprojects.org.uk/projects/simpleSIO/ssio.htm

then there was the Navi Soladin interface
https://www.navitron.org.uk/forum/index.php/topic,3529.0.html

if the drawings gone, i may have it saved somewhere.
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jonesy
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« Reply #23 on: September 09, 2015, 08:53:32 PM »

877a - that's quite an old pic.  Usually used at 5v but is specified for use at 3.3v or 3v3 (as skyewright says) if the voltage on pin 1 is 5v then it's running at 5v - it's the reset pin, but it's easier to access than the 5v supply.
If the max232 is running hot you are really abusing it, but maxim stuff is usually bullet proof. You can easily test the maxim by opening a real term serial session on the laptop and looping back the rx rx pins on the max232. Ensure local echo is off and check for typed characters on the screen.
You sure you're not on the in circuit programming pins (1, 39, 40)
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Nickel2
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« Reply #24 on: September 10, 2015, 12:01:41 AM »

Just had a look at the schematic for the MAX 232. I'm not familiar with the animal, but it does give a bit of an idea of the function.

https://www.google.co.uk/search?q=max+232&biw=1280&bih=896&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMIxp-d_ILrxwIV5GrbCh2jOQyy#imgrc=xRhYXcxZzeed-M%3A

N2
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EpEver 4210A at 24v
New (Old) 8S7P LiFe battery, 105Ah @ 26.4V
EpEver STI1000-24-230 pure sine inverter
Of course it'll work. (It hasn't caught fire yet).
jonesy
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« Reply #25 on: September 11, 2015, 10:04:16 PM »

If you are connecting to pins 1 and 40, the connector is for in circuit programming with a dedicated programmer and not rs232. The 877 is Rx on 26, tx on 25.
I think we are on cross purposes with the word inverted.  I mean logical inversion, so a 1 is made into a 0.
The max 232 has a voltage doubler onboard, so you will find around -10 and +10 ish. Ignore the internal goings on inside the chip.  There is a logical inversion, but that is normal for rs232.
Try tracing pins 25 & 26.
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camillitech
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« Reply #26 on: September 12, 2015, 07:01:45 AM »

Brand spankin' shiney new, RRP extrahappy
How could I resist!


Can I AC couple this without frequency shifting? GTI into genset input, inverter in gen. support mode and dump loads on the battery?




Morning Scruff,

excellent stuff but sadly most of it is over my head, though I am learning, regarding the 'AC coupling' but bear in mind I'm no sparky.

So long as it's not transformerless and your input does not exceed the charger capacity then you should be OK. You will however need to make sure your Tri Stars and dumps can cope with whatever you're adding. Don't think the genset input is the way to go though (most GTI's require to see a 'grid' ) unless you are using just solar, normal practice would be the AC bus.

Chances are if you contact Mastervolt they'll say no, I did it with a Trace years ago and they said a big NO, went ahead and did it anyway and all was peachy.

https://lifeattheendoftheroad.wordpress.com/2012/05/15/commissioning-the-powerspout/

Good luck, Paul
« Last Edit: September 12, 2015, 07:57:49 AM by camillitech » Logged

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'Off grid' since 1985,  Proven 2.5kW, Proven 6kW direct heating, SMA SI6.OH, 800ah Rolls, 9kW PV ,4xTS45, Lister HR2 12kW, , Powerspout pelton, Stream Engine turgo, 60 x Navitron toobs and a 1500lt store. Outback VFX3048 and 950ah forklifts for backup,
jonesy
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« Reply #27 on: September 12, 2015, 03:12:35 PM »

Something that occurred to me overnight.  There is a method to program a pic through the serial port - it's called serial bootloading.  It is technically possible on the '877a; the person that wrote the code would have needed to put a special extra bit in.  IIRC Microchip have provided bootloader add-ons.  You would need to know the protocol of the bootloader, so maybe some more googling required.  Do you have the windows programme and software update file you could link me too.  I might be able to work out how to put the updated code in.
However, you'd still need to identify pins that a programmer/bootloader could connect to.
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jonesy
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« Reply #28 on: September 13, 2015, 10:15:42 PM »

2500kVA eh?  Might get one myself at that price Grin
The neutral earthing through a relay is interesting - boat specific? I've no experience there. I like their 'local rules may apply' get out of jail free card.
Isnt the neutral/earth relay a point of failure as there is no way of knowing that it has made the link, or burnt out - it isn't fail safe.
The pin numbers I gave for the 877 are the DIL version.  Is yours surface mount?
Not so long ago I came across a mass produced British made product that used a mini USB socket.  If you connected it to your laptop, it blew out the USB, as it was actually rs232 levels.  Is the 9D rs232?
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camillitech
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« Reply #29 on: September 13, 2015, 11:03:04 PM »


The neutral earthing through a relay is interesting - boat specific? I've no experience there. I like their 'local rules may apply' get out of jail free card.
Isnt the neutral/earth relay a point of failure as there is no way of knowing that it has made the link, or burnt out - it isn't fail safe.


Aye Jonesy, this is common and accepted practice regarding connecting boats to a shore supply. Like you rightly point out 'it isn't fail safe' on most small craft but an alarm will activate on larger vessels.
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http://lifeattheendoftheroad.wordpress.com/

'Off grid' since 1985,  Proven 2.5kW, Proven 6kW direct heating, SMA SI6.OH, 800ah Rolls, 9kW PV ,4xTS45, Lister HR2 12kW, , Powerspout pelton, Stream Engine turgo, 60 x Navitron toobs and a 1500lt store. Outback VFX3048 and 950ah forklifts for backup,
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