Search found 2720 matches

by weber
Thu, 03 Sep 2020, 12:18
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 509
Views: 60628

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: 71139

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: 329
Views: 39036

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: 2710
Views: 648881

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: 824

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: 2710
Views: 648881

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: 509
Views: 60628

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: 345
Views: 40168

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: 824

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: 824

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: 824

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: 176
Views: 23021

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: 509
Views: 60628

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: 2710
Views: 648881

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: 2710
Views: 648881

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: 345
Views: 40168

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: 345
Views: 40168

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: 34
Views: 4657

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...
by weber
Wed, 06 May 2020, 10:26
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 34
Views: 4657

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

I followed it almost immediately with this email: I just noticed an inconsistency in what I wrote. I wrote: "In each of the pairs zetta/zepto and yotta/yocto, the initial consonant and vowel are the same, and I agree we should continue that pattern." But I later recommended renna/rovo, which have di...
by weber
Wed, 06 May 2020, 10:24
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 34
Views: 4657

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

Serious unit nerds (like myself) may be interested to read this email I wrote to SI expert Dr Richard Brown back in September 2019. It's about what comes after yotta = 1000⁸, and so relates to this post earlier in this topic . Dear Dr Brown, I have just read your article, " On the nature of SI prefi...
by weber
Tue, 05 May 2020, 21:17
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 345
Views: 40168

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

OK. Well that is some evidence that the GK does undeclared grid interactivity. Enough not to take the risk, but not enough to find them guilty beyond reasonable doubt. Is there someone out there with a PIP-GK or an Axpert VM III who can tell us whether the output voltage is 230 V, or is the same as ...
by weber
Tue, 05 May 2020, 15:36
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 345
Views: 40168

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

That makes them "even more illegal" for use in Australia and I assume most other countries Thanks, that was my main concern: the "legal" aspect. I'm not allowed to have any grid injection and I don't want to get in trouble. I suspect Coulomb may be mistaken here. :o    I can't find any evidence tha...
by weber
Tue, 05 May 2020, 06:05
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2710
Views: 648881

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

paulvk wrote: Mon, 04 May 2020, 12:15 Have you measured the lowest it goes before distortion ?
Yes. Coulomb and I posted about that back in November. 48.1 V for the 64 V model. 42.1 V for the 58.4 V model.
by weber
Mon, 04 May 2020, 09:08
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2710
Views: 648881

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

The only thing I have to add to Coulomb's excellent post, is that you can't parallel a 64/66 V model with a 58.4/60 V model. The 58.4 V model is preferred, because it can maintain a proper sine wave down to lower battery voltages.
by weber
Mon, 27 Apr 2020, 07:52
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 509
Views: 60628

Re: PIP inverter repairs and hardware modifications

Hey weber, a follow-up question to this, I have opposite occurrence where the load would increase and the fan speed does not increase to compensate and the inverter eventually throws a 02 fault code, meaning a temperature rise of 100 degrees, I removed the two fans and they do work at full throttle...