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by T1 Terry
Fri, 17 Apr 2020, 09:02
Forum: For Sale/Wanted
Topic: Ex train super caps maxwell
Replies: 6
Views: 544

Re: Ex train super caps maxwell

Sorry for the dumb questions, but the 48v mentioned as the base block voltage, is that peak or nominal? Do capacitors even have a nominal voltage? I thought capacitors were not intended to be run near their rated voltage so if the rated voltage is 48v per pack, what would a sensible running voltage ...
by T1 Terry
Mon, 13 Apr 2020, 12:27
Forum: For Sale/Wanted
Topic: Ex train super caps maxwell
Replies: 6
Views: 544

Re: Ex train super caps maxwell

Hi Matt, how do you calculate the equivalent Ah capacity or Wh from each of these 48v capacitors?

T1 Terry
by T1 Terry
Sun, 12 Apr 2020, 11:42
Forum: Renewable Energy and Storage (Non-EV)
Topic: noise filtering on PIP inverter
Replies: 6
Views: 329

Re: noise filtering on PIP inverter

We had serious issues with the early PiP 24v PWM controller models and sorted it by looping each cable through a ferrite choke. I note that the Projecta mains chargers do the same thing inside the unit so they must have had issues as well. I wonder what voltage the solar input is, both open circuit ...
by T1 Terry
Tue, 07 Apr 2020, 15:01
Forum: Renewable Energy and Storage (Non-EV)
Topic: Grid Tie inverter / charger with AGM batteries
Replies: 5
Views: 364

Re: Grid Tie inverter / charger with AGM batteries

Do you have grid tie solar at the moment? If you don't, you need to get the tick of approval for your battery system and inverter before they will let you put it on the grid, then you need to jump through the hoops to get the while lot certified. Forget about using anything second hand for a grid ti...
by T1 Terry
Tue, 07 Apr 2020, 10:15
Forum: Members Machines
Topic: 4Springs' Brumby
Replies: 297
Views: 49139

Re: 4Springs' Brumby

I seem to remember a few years back that there was a similar issue on the DIY forum regarding pouch cells, but I never followed the thread so no idea if there was a fix or reason established. I don't think they were NMC pouches either, I think they were LiFeP04 chemistry, but I could be wrong. T1 Te...
by T1 Terry
Tue, 07 Apr 2020, 10:10
Forum: For Sale/Wanted
Topic: Salvage model 3
Replies: 9
Views: 678

Re: Salvage model 3

Current bid is at $33,500 and the auction still has 3 hrs to run, crazy. If Tesla has decided it is an unrepairable write off, then that is what it is, if Tesla has wiped their hands of it then it is only good for parts.

T1 Terry
by T1 Terry
Sat, 04 Apr 2020, 12:48
Forum: Mitsubishi
Topic: Aftermarket iMiEV battery upgrade project
Replies: 279
Views: 31700

Re: Aftermarket iMiEV battery upgrade project

To be honest the concept of an M4 screw into a bit of aluminium is sound - there should be more than enough contact and pressure. The problem is the really bad job they did of tapping threads - clearly done by machine with little care and attention. All the Winston cells we have been getting for th...
by T1 Terry
Fri, 03 Apr 2020, 14:03
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

I think you are missing the fact an MPPT controller needs to see a battery voltage so it can determine the voltage/current that is the optimum output from the input it sees. I assumed that it would just try larger and larger PWM duty cycle until the maximum current flowed. Maybe some would be surpr...
by T1 Terry
Fri, 03 Apr 2020, 13:56
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

The biggest problem with SBMS0 and DMPPT is that your panels got to be wired in a special way, you need a 1 panel string, a 2 panel strings, a 4 panels string ... a 8 panels string.. cause the DMPPT will "connect" those strings according to the resistive elements that are connected .. and that are ...
by T1 Terry
Thu, 02 Apr 2020, 10:11
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

Is there a device able to transform whatever Voltage x Amp (max 140V, max 40 Amp) to a linear Voltage x Amp .. ? In short, a DC to DC convertor with variable input and variable output, output just have to be linear, this line will depend on the resistance of the element. It seems to me that an off-...
by T1 Terry
Wed, 01 Apr 2020, 11:35
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

The method I described is not the most efficient, but it is waste solar anyway so what does it matter? It does work because I've used it on a number houseboats and off grid systems. For the parallel connected 12v PWM controlled set ups, we use a 24v element, not efficient but a high level of over vo...
by T1 Terry
Tue, 31 Mar 2020, 07:57
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

I would more likely use the direct solar feed to the heater element loads. By diverting some of the solar once the end of bulk charging is reached the solar current to the battery is reduced stopping the "bounce" excessive solar can cause because the battery voltage jumps up suddenly rather than a ...
by T1 Terry
Mon, 30 Mar 2020, 12:56
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

I would more likely use the direct solar feed to the heater element loads. By diverting some of the solar once the end of bulk charging is reached the solar current to the battery is reduced stopping the "bounce" excessive solar can cause because the battery voltage jumps up suddenly rather than a s...
by T1 Terry
Sat, 28 Mar 2020, 14:00
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

I would not be running 48v for lighting even with the loss in the inverters 230v led lighting is much more efficient. I have compared 12v led lighting to 230v and I can light a whole room brightly with two 10 watt 230v down lights I could use 40 watts of 12v and not get it that bright I have 48v DC...
by T1 Terry
Sat, 28 Mar 2020, 13:51
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

Victron MultiPlus 48/5000/70-100 230V VE.Bus $2,475.00 Then you have to get an MPPT charger 60amp 48v $700 so $3175 to get one PIP A major downside to the Victron products, they don't handle the Australian heat very well. They de-rate at an internal temp of 40*C and shut down at 60*C. Where we see ...
by T1 Terry
Thu, 26 Mar 2020, 15:46
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 145
Views: 18050

Re: Francisco's Electric Pajero

What voltage is considered 100% capacity? In other words, at what voltage does the cell voltage rise rapidly yet only a small current going into the cell. LFP and LYP cells will voltage balance quickly below fully charged but that has nothing to do with the state of charge being balanced. The only ...
by T1 Terry
Wed, 25 Mar 2020, 11:04
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 145
Views: 18050

Re: Francisco's Electric Pajero

What voltage is considered 100% capacity? In other words, at what voltage does the cell voltage rise rapidly yet only a small current going into the cell. LFP and LYP cells will voltage balance quickly below fully charged but that has nothing to do with the state of charge being balanced. The only p...
by T1 Terry
Thu, 19 Mar 2020, 13:26
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter setting
Replies: 5
Views: 601

Re: PIP inverter setting

If you set menu 29 too high the inverter/s will throw a code 52 when a heavy load is applied, even with lithium batteries. We set Menu 29 to 46v for a 48v pack but we also have a low cell voltage alarm set at 2.8v and cut at 2.6v to allow a bit of voltage sag if a very heavy load is applied for a sh...
by T1 Terry
Thu, 19 Mar 2020, 10:04
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter setting
Replies: 5
Views: 601

Re: PIP inverter setting

Menu 12 and 13 are only important if you have a grid power back up available. If you are using a generator as the back up supply, you are better of setting menu 01 to UTI so as soon as the generator power is sensed and tested to be stable and suitable, it will use the generator output to power the l...
by T1 Terry
Tue, 17 Mar 2020, 12:23
Forum: Members Machines
Topic: Qld Moke
Replies: 12
Views: 1584

Re: Qld Moke

The test with old cars used to be that you would hold a magnet up against the panels and wait for it to fall off. You could cover about 2 m^2 before you found some steel :D The car yard panel shops would put iron filings in the bog to make it appear like metal for the magnet test. I've seen sill ra...
by T1 Terry
Fri, 13 Mar 2020, 15:37
Forum: Batteries, charging, management and monitoring
Topic: OK I'm confused!
Replies: 16
Views: 744

Re: OK I'm confused!

This is one of those strange things I've discovered over the yrs. Inverters and generators that put out a modified sine wave (that often isn't much better than a square wave) seem to work very well with dumb non power factor rectified chargers. Before DC to DC chargers came down in price, we often u...
by T1 Terry
Fri, 13 Mar 2020, 07:39
Forum: The Lounge
Topic: Nuclear power for Australia
Replies: 9
Views: 704

Re: Nuclear power for Australia

And with the current global economic downturn, I reckon the global flow of money will grind to a halt. About the only thing we can hope is that translates into a drop in emissions... That might effect the sales of Corona and slow the spread of the Corona Virus ...... just keeping up the bird eating...
by T1 Terry
Thu, 12 Mar 2020, 13:51
Forum: The Lounge
Topic: Nuclear power for Australia
Replies: 9
Views: 704

Re: Nuclear power for Australia

That is nearly as good as the fellow I heard interviewed on the ABC radio who concluded that he found no dead birds under the wind turbines because the farmer had trained the cows to eat them. Ooooooookaaaaaay... :o Must have been vegetarian duck ... or maybe vegan, then the vegetarian cows can eat...
by T1 Terry
Thu, 12 Mar 2020, 13:36
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverters in parallel to power a house
Replies: 14
Views: 1180

Re: Inverters in parallel to power a house

Out of curiousity what do you use for a circuit breaker between the the inverters and battery bank? Mine is 100amp and dumps out if our 3kw latronics has too bigger draw forced on it! In the second photo and a bit in the third photo, you can see the big red cable coming out of the control box from ...
by T1 Terry
Fri, 28 Feb 2020, 09:55
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter for 48v off grid - PIP xxxxx or something else?
Replies: 67
Views: 2716

Re: Inverter for 48v off grid - PIP xxxxx or something else?

I think I'm pretty settled on the PIP now, the only consideration is you've prompted me to think about whether I should go for a 24v or 48v set up. Other than the peak power it looks like the charging current would also be limited to less than my solar panels can put out (especially if/when I get m...