Search found 2727 matches

by weber
Fri, 09 Oct 2020, 12:33
Forum: Mitsubishi
Topic: Aftermarket iMiEV battery upgrade project
Replies: 405
Views: 47948

Re: Aftermarket iMiEV battery upgrade project

That's great news. Am I correct in saying that you've shown you can access 80% of the capacity of the new battery? What was the lowest cell voltage it got down to? Do you have any hypotheses as to why you don't need (a) current unspoofing or (b) cell voltage spoofing? Surely that horrendous circuit ...
by weber
Wed, 07 Oct 2020, 09:55
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2741
Views: 673663

Re: PIP-4048MS and PIP-5048MS inverters

Thanks Coulomb. No need to apologise. Instead you are to be praised for discovering this and informing the rest of us. I note that there is a whole post on the POPV command here: https://forums.aeva.asn.au/viewtopic.php?p=66646#p66646 But the PSAVE command sounds like it would be a lot more convenie...
by weber
Tue, 06 Oct 2020, 06:55
Forum: Electric motors and controllers
Topic: Changing an induction motor voltage
Replies: 436
Views: 125230

Re: Changing an induction motor voltage

I don't know about the slip, but the V/Hz should be 1/4 of what it was.
by weber
Tue, 29 Sep 2020, 06:20
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 386
Views: 47390

Re: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)

... 5048GK ... I didn't found the accumulated values that are available in the display. Do you know if that information is available though a Q command ? Hi glococo , I moved your post from the MS topic to this GE/GK/MG topic. I assume the GK is the same as the MK in that regard, in which case the ...
by weber
Mon, 28 Sep 2020, 18:51
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 42
Views: 5957

Re: How to tell a kilowatt hour from a kelvin week henry

This may also be of interest: Battery capacity is called C . This is in italics because it is a quantity symbol, not a unit symbol. Its units are amp-hours (Ah). In the case of lithium-ion batteries, we are concerned with the maximum rate (i.e. maximum current) at which they are allowed to be charge...
by weber
Mon, 28 Sep 2020, 18:27
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 42
Views: 5957

Re: How to tell a kilowatt hour from a kelvin week henry

Here's something I wrote for a battery course for Electricians, about the relationship between amps and amp hours. It could easily be reworded to refer to watts and watt hours. Battery Capacity The capacity of a battery (quantity symbol C ) is how much electric charge it can store. We could measure ...
by weber
Sun, 27 Sep 2020, 09:51
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 42
Views: 5957

Re: How to tell a kilowatt hour from a kelvin week henry

Hi Chuq,

I'm afraid I'm too busy with other things at the moment to contribute in any way. But feel free to use anything from my post.
by weber
Thu, 03 Sep 2020, 12:18
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 528
Views: 69266

Re: PIP inverter repairs and hardware modifications

Not necessarily across the 15 V or 12 V supply, but at least involved in producing those supplies. Possibly the electrolytic across the supply pins of the PWM chip involved in making those supplies.
by weber
Wed, 26 Aug 2020, 07:01
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 443
Views: 72895

Re: Low cost BMS

That sounds good 4Springs. Although I've never felt the need to use explicit PWM, because when you just turn bypass on or off at the threshold (e.g. your lowest + 10 mV, no hysteresis), they will balance as quickly as possible, and when they get close to balanced they naturally enter into a sort of ...
by weber
Fri, 21 Aug 2020, 14:58
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 366
Views: 45073

Re: PIP-5048MK inverter

And most importantly, the protection device closest to the battery must have a kA rating (interrupting capacity) that is greater than the maximum short circuit current of the battery. Otherwise, in the event of a short circuit, it will not go open circuit but will continue to arc over and will not p...
by weber
Tue, 18 Aug 2020, 10:17
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2741
Views: 673663

Re: PIP-4048MS and PIP-5048MS inverters

I'm interested in what KettleComp is actually compensating for, the science of it, why does adding 2KW of load to my big battery lower the voltage by 0.5V, does this voltage drop happen on a Victron BMV? Hi Richard. It is compensating for the internal resistance of the battery. An ideal battery wou...
by weber
Wed, 05 Aug 2020, 19:40
Forum: Renewable Energy and Storage (Non-EV)
Topic: Solar panels in series / parallel
Replies: 22
Views: 1352

Re: Solar panels in series / parallel

The damage looks like it was from arcing.
by weber
Thu, 30 Jul 2020, 18:54
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2741
Views: 673663

Re: PIP-4048MS and PIP-5048MS inverters

We have just bumped patched firmware 74.40e from beta to release. This is firmware for some 5 kW / 5 kVA / PF1 models without the 64 V option. The only change was the first letter of the version number (from B to L). This was after 5 months and 107 downloads of the LFP version and 82 downloads of th...
by weber
Mon, 13 Jul 2020, 06:04
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 528
Views: 69266

Re: PIP inverter repairs and hardware modifications

manio wrote: Sun, 12 Jul 2020, 23:36 I only want to let you know that it seems that I've successfully repaired my inverter thanks to you guys!
Congratulations, Manio! That's great to hear. :) And thanks for the writeup.
by weber
Wed, 08 Jul 2020, 13:43
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 386
Views: 47390

Re: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)

Well, the icons from the user manuals do seem to indicate "grid-interactive" for GK double-conversion for MK But how much can we trust these to be accurate depictions of what happens under the hood? I can confirm that this is what happens with my 3024GK Thanks for confirming that. OK. Well that is ...
by weber
Tue, 30 Jun 2020, 14:10
Forum: Renewable Energy and Storage (Non-EV)
Topic: Solar panels in series / parallel
Replies: 22
Views: 1352

Re: Solar panels in series / parallel

If the 190 W panels have 72 cells and the 250 W panels have 60 cells, as is usually the case, that's a 6:5 ratio. That means you will only be able to match voltages if you have a string of 5 x 190 W panels in parallel with a string of 6 x 250 W panels. Or a string of 10 x 190 W with 12 x 250 W. If y...
by weber
Fri, 26 Jun 2020, 22:13
Forum: Renewable Energy and Storage (Non-EV)
Topic: Solar panels in series / parallel
Replies: 22
Views: 1352

Re: Solar panels in series / parallel

So that means: 1 string - no fuse. 2 strings in parallel - no fuse. 3 strings in parallel - fuses on all strings. Correct. Because in the case of three strings in parallel, if one string had a failed diode in a panel, the other two strings would have enough potential to push current back through th...
by weber
Fri, 26 Jun 2020, 17:07
Forum: Renewable Energy and Storage (Non-EV)
Topic: Solar panels in series / parallel
Replies: 22
Views: 1352

Re: Solar panels in series / parallel

As to the inputs of those MPPTs, generally there's no problem with putting two separate arrays of equal voltage in parallel, but any more than three strings in parallel will need fuses on each string. I think that's right @weber ? No. Any more than 2 strings in parallel requires a fuse in each stri...
by weber
Tue, 16 Jun 2020, 15:20
Forum: Members Machines
Topic: Francisco's Electric Pajero
Replies: 185
Views: 24573

Re: Francisco's Electric Pajero

That's awesome. Good on you for having a go. :clap:
by weber
Thu, 11 Jun 2020, 07:16
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 528
Views: 69266

Re: PIP inverter repairs and hardware modifications

The left one is 10 ohms, but the right one is only 200 ohms. The marking "2000" means 200 × 10⁰ ohms. I don't know why they don't mark them "200R" to avoid this confusion.

You can find the MOSFET driver schematic linked from the index post (first post) of this thread.
by weber
Thu, 28 May 2020, 11:20
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2741
Views: 673663

Re: PIP-4048MS and PIP-5048MS inverters

I assume that the KettleKomp™ voltage is tested against PBCV and raw battery voltage against PSDV. Am I right? No. All comparisons related to either low cutoff voltage (PBCV) or back-to-utility voltage (PSDV) use the compensated battery voltage. That includes the low battery warning that appears be...
by weber
Tue, 12 May 2020, 07:23
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2741
Views: 673663

Re: PIP-4048MS and PIP-5048MS inverters

Is there a command (in the patched firmware) that switches the inverter back to battery before the "back to battery voltage" [variabel 13] is reached? And if yes, is there a command to switch to grid before "back to AC" voltage [12] or "battery cut off" voltage [29] is reached? No. But in both patc...
by weber
Thu, 07 May 2020, 10:39
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 386
Views: 47390

Re: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)

I concede defeat on one aspect at least. Clearly coulomb was right that all 3 high-voltage-SCC models can do solar+utility->loads. It's still not entirely clear how they do it. Or why some of them can only do it when there is no battery. I note that merely blending solar+utility is not what's at iss...
by weber
Wed, 06 May 2020, 16:41
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 386
Views: 47390

Re: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)

The Watchpower image here https://www.solar-shop.co.za/content/11-axpert-voltronics-power-use certainly shows an inverter doing solar+utility->loads, with no battery. It claims to be of an MG/MKS II (PIP/Axpert). Is there anything in the image itself that confirms it is that model? e.g. the serial n...
by weber
Wed, 06 May 2020, 10:43
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 42
Views: 5957

Re: How to tell a kilowatt hour from a kelvin week henry

I received the following reply: Hi Dave, Thanks for your e-mail. You raise some interesting points. The choice of symbols is an interesting one. There are very few un-used symbols! I discounted ‘x’ mainly because it is used as the multiplication symbol. I preferred symbols not already used in the SI...