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Forum Index : Electronics : 150V 45A MPPT - roll your own

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Warpspeed
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Joined: 09/08/2007
Location: Australia
Posts: 4253
Posted: 01:20am 11 Oct 2021
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How's the back Peter ?
Cheers,  Tony.
 
poida

Guru

Joined: 02/02/2017
Location: Australia
Posts: 1035
Posted: 02:49am 11 Oct 2021
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Better each day. I need to be able to work tomorrow. And fold in 1/2 to get in the
MX5 to drive to work. I don't think it was a disk, I think only muscle strain.
wronger than a phone book full of wrong phone numbers
 
Warpspeed
Guru

Joined: 09/08/2007
Location: Australia
Posts: 4253
Posted: 02:54am 11 Oct 2021
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A soak in really hot bath usually works for me for those types of problems.
What MX5 do you drive ?
I have a a white 99' NB1
Cheers,  Tony.
 
poida

Guru

Joined: 02/02/2017
Location: Australia
Posts: 1035
Posted: 10:11am 11 Oct 2021
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Warp:
A 99 NB with 310,000km on it, broken everything but it runs. And leaks a bit of
oil out of all ends. Busted bodywork but that suits me nicely.
I get free fuel from work and I have had the car since 2005 so it costs me
not much more than $1K per year.
I am now thinking of a KTM RC390 motorbike. Already I have
a 900 Superlight Ducati but the KTM seems a good fit for getting to work.

Anyway, back to the subject at hand..

The damage to the screwdriver:






All in the name of science. (as Photinicinduction would say)

Code changes now look for a short and modify the PID loop
whilst shorted. This prevents voltage overshoot when the short is removed.
This is a great start for a home brew big current, big voltage power supply
for the bench and ebike charger.
I want well over 60V and 20 Amps and for it to be indestructible.
wronger than a phone book full of wrong phone numbers
 
noneyabussiness
Guru

Joined: 31/07/2017
Location: Australia
Posts: 371
Posted: 09:42pm 13 Oct 2021
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reminds me of the time I dropped a screwdriver on a 48v bus bar before the fuses... literally made the section between contact points disappear,  never found it..

and it was a big screwdriver...

lesson learned,  moved + and - much further apart..
I think it works !!
 
poida

Guru

Joined: 02/02/2017
Location: Australia
Posts: 1035
Posted: 06:33am 14 Oct 2021
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Noneya, big current can be impressive.
And when it's DC, it is even a better show.
My only, so far, mistake was to let a nice 13mm ring spanner
short a + and - on a 4 x 200AH SLA bank at 24V. It only just chewed
a little off the side of the handle.

During testing of the above, I had the firmware not looking for short circuit
and just trying to attain the voltage setpoint, while the FET/current sensor thing
was doing it's thing.
I could set the OC protection to about 35 Amps and let the screwdriver graze
a conductor and nearly maintain an arc. 35 Amps at less than 0.5V is not impressive
but it still bites a hole in the metal.

All this and not blowing up 2x nice MOSFETs.
Maybe I could adapt this to be a TIG welder..probably not.
wronger than a phone book full of wrong phone numbers
 
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