Search found 2626 matches

by weber
Tue, 27 Aug 2019, 13:40
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 1412

Re: HELP PLEASE I think I killed my cells

Iamsam wrote:
Mon, 26 Aug 2019, 18:45
I was just originally hoping to find one that could put out high voltages, but I can only find massive pro ones for squillions of dollars
Yes. Sorry. I should have told you that in response to your original post.
by weber
Tue, 27 Aug 2019, 13:38
Forum: Nissan
Topic: Home charging
Replies: 24
Views: 1095

Re: Home charging

Part of the issue for me is that they DON'T provide a wall to vehicle EVSE only a type 2 to type 2. I wouldn't be having this discussion except i have to choose between a $500-600 dollar cable or a $900 plus installation wall charger. So the gap is reduced by Nissans choice of cable they supply. ma...
by weber
Tue, 27 Aug 2019, 12:43
Forum: Nissan
Topic: Home charging
Replies: 24
Views: 1095

Re: Home charging

Bryce, can you point me to where, in the Nissan Leaf Owner's Manual, it says the supplied EVSE is only for emergency charging? Here's what I find in the printed manual that came with my wife's 2012 Nissan Leaf, page CH-6: "Normal charging is performed using an 110-240 volt dedicated electrical outle...
by weber
Tue, 27 Aug 2019, 12:27
Forum: Nissan
Topic: Home charging
Replies: 24
Views: 1095

Re: Home charging

Bryce, what do those photos have to do with a portable EVSE plugged directly into a 15 A IP63 outlet (or better)? All I see is a DIY plug, and an extension lead left out in the weather. Coulomb, the term "granny charger" is what people call a portable EVSE to make themselves feel better after they r...
by weber
Sun, 25 Aug 2019, 15:59
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 1412

Re: HELP PLEASE I think I killed my cells

What about a lab power supply. Cheap enough Yeah. I expected to find a cheap one at Jaycar, and gave up when I didn't. But you're right. Here's a cheapie. https://www.catch.com.au/product/yescom-30v-5a-dc-power-supply-adjustable-dual-digital-variable-precision-lab-grade-2811628/?offer_id=15371148&g...
by weber
Sun, 25 Aug 2019, 06:08
Forum: Technical and conversion discussion
Topic: Prelude conversion project - some questions
Replies: 529
Views: 37774

Re: Prelude conversion project - some questions

Petie wrote:
Sat, 24 Aug 2019, 21:57
Hi friendws!
Before I joint the forum, I could view the drawings etc. attached to this blog now they are gone, I wonder why?
It says: You don't have the required permissions...
Welcome, Petie. Thanks for letting us know about this problem. It should be fixed now.
by weber
Sat, 24 Aug 2019, 15:35
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 1412

Re: HELP PLEASE I think I killed my cells

Scratch that. It has hiccup-mode overcurrent protection. It doesn't simply current-limit.
Unfortunately the constant current version is way more expensive.
https://www.jaycar.com.au/40w-24v-1-67a ... y/p/MP3375
by weber
Sat, 24 Aug 2019, 15:28
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 1412

Re: HELP PLEASE I think I killed my cells

If the charger was designed for lead-acid it will probably have a float stage, and therefore work fine with the floodlight trick. But if it was designed for lithium-ion, that trick probably won't work, because they typically just stop charging when they think the battery is full. Another reason the ...
by weber
Fri, 23 Aug 2019, 18:47
Forum: Batteries, charging, management and monitoring
Topic: HELP PLEASE I think I killed my cells
Replies: 27
Views: 1412

Re: HELP PLEASE I think I killed my cells

Sam, I think you are wise to want to charge it at only 0.5 A. I assume you've heard about the dangers of "copper dendrites". When a lithium ion battery has been sitting at less than 2.0 volts, the copper current-collectors start to dissolve in the electrolyte. If you recharge after that, the copper ...
by weber
Tue, 20 Aug 2019, 09:15
Forum: Nissan
Topic: Climate control mod to turn off heater
Replies: 4
Views: 409

Re: Climate control mod to turn off heater

Top marks for actually posting about it, Coulomb. But man! That's ugly. :) And I don't understand why you think you need the extra two resistors. I've been sitting on the photo below for the 6 weeks since you watched me do it (for my wife's Leaf), and I gave you the parts to do yours. It works just ...
by weber
Thu, 08 Aug 2019, 08:06
Forum: Renewable Energy and Storage (Non-EV)
Topic: Nickel Iron Batteries real data
Replies: 20
Views: 1119

Re: Nickel Iron Batteries real data

The lithium ion is smaller, and presumably more mobile than potassium ions, but if that's the case, why then not use entirely LiOH? Cost perhaps? Diminishing returns? I believe the reason is diminishing returns, not cost. Yes the bare lithium ion is smaller, but a funny thing happens in solution. T...
by weber
Wed, 07 Aug 2019, 14:44
Forum: Renewable Energy and Storage (Non-EV)
Topic: Nickel Iron Batteries real data
Replies: 20
Views: 1119

Re: Nickel Iron Batteries real data

Yeah the LiOH is only an additive. Edison's patents mention 2% by weight. Here's a modern recipe: http://nickelcells.com/pdf/manuf/Taihang%20operation%20and%20maintenance%20NiFe%20battery.pdf It's 20 g of LiOH and either 333 g or 313 g (it's hard to tell which) of KOH per litre (998 g) of distilled ...
by weber
Wed, 07 Aug 2019, 11:27
Forum: Admin Notices
Topic: Forum search fixed
Replies: 0
Views: 579

Forum search fixed

If you've given up on using the AEVA forum's search facility, because you've been told waaay too many times: The following words in your search query were ignored because they are too common words: or Each word must consist of at least 3 characters and must not contain more than 14 characters exclud...
by weber
Mon, 05 Aug 2019, 09:03
Forum: Renewable Energy and Storage (Non-EV)
Topic: Nickel Iron Batteries real data
Replies: 20
Views: 1119

Re: Nickel Iron Batteries real data

Thanks paulvk. I look forward to your data.

Reading this thread so far, was like stepping back in time. Not because you're talking about NiFe cells, but because you're only comparing them to lead-acid. :)
by weber
Mon, 29 Jul 2019, 13:17
Forum: Batteries, charging, management and monitoring
Topic: LFP SOC vs Pack Voltage
Replies: 12
Views: 755

Re: LFP SOC vs Pack Voltage

I had a question by email asking "What's special about 30% SoC?" which I choose to answer instead as "What's special about 3.25 V rested?" The answer is analogous to what I wrote about 3.45 V (100%) above. 3.25 V (when the last thing it did was gently discharge) is a good choice because it's about a...
by weber
Sat, 27 Jul 2019, 08:27
Forum: Batteries, charging, management and monitoring
Topic: LFP SOC vs Pack Voltage
Replies: 12
Views: 755

Re: LFP SOC vs Pack Voltage

Terry, Although I disagree that there any such thing as a true 100% rested voltage, I agree that 3.45 V (when the last thing it did was gently charge) is an excellent choice. It must be, since it's what Coulomb and I use. :D And I agree that this corresponds to about 3.40 V when the last thing it di...
by weber
Thu, 25 Jul 2019, 14:46
Forum: Batteries, charging, management and monitoring
Topic: LFP SOC vs Pack Voltage
Replies: 12
Views: 755

Re: LFP SOC vs Pack Voltage

Unfortunately the graphs vary the most at exactly the SOC and OCV values that concern me the most. The various graphs seem to have OCV "falling off a cliff" as jonescg said at very differing OCV's. I suspect you mean "at very differing SoCs". Well spotted. The reason is that it is somewhat arbitrar...
by weber
Tue, 23 Jul 2019, 10:13
Forum: Batteries, charging, management and monitoring
Topic: LFP SOC vs Pack Voltage
Replies: 12
Views: 755

Re: LFP SOC vs Pack Voltage

Hi Paul9, I note that what you say about the difficulty of estimating SoC from OCV does not apply to all lithium-ion chemistries. It's only LFP that has this problem. And it's not because it's non-linear, it's because it's flat. Here are the graphs you want: See figure 2 on page 3 of: http://www-per...
by weber
Sat, 20 Jul 2019, 09:26
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 161
Views: 12027

Re: PIP-5048MK inverter

Thanks for correcting me about QP2GSn. I was not aware of it. But I still don't understand why it exists, since I can't find any Voltronic/MPP-Solar model that has multiple MPPTs and is parallelable.
by weber
Fri, 19 Jul 2019, 18:47
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 161
Views: 12027

Re: PIP-5048MK inverter

Yes only way to read power of PV is QPIGS. That show (MMMMM) same value than PV power (W) on inverter panel. I know about QPIGS and QPGSn (not QPSGn as you have sometimes written). But I'm not talking about power (W), I'm talking about energy (Wh). The King/PIP-MK logs the energy per day, per month...
by weber
Fri, 19 Jul 2019, 07:15
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 161
Views: 12027

Re: PIP-5048MK inverter

Command manual... Thanks for that. But sadly, it does not show any command for querying the PV and Load energy. The fact that the command to reset this log is RTEY, may be a hint that the command to read it may be QEY. Or there may be no such command. Can you read this info using WatchPower? It doe...
by weber
Fri, 19 Jul 2019, 05:55
Forum: Renewable Energy and Storage (Non-EV)
Topic: Inverter solar charger 2 kVA SCC problem
Replies: 2
Views: 318

Re: Inverter solar charger 2 kVA SCC problem

I've seen this with two otherwise-identical PIP-4048MS. One will do it and one won't. I don't know what causes it, but I imagine there must be some unintended leakage path from battery to input, whose resistance varies between units, and in some cases it subceeds a threshold, such that it's enough t...
by weber
Thu, 11 Jul 2019, 06:45
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 161
Views: 12027

Re: PIP-5048MK inverter

Yes, my galaxy s7 works "fine". Well, I need to be about close as 2m and it's still disconnect now and then. But yes, I can use BT with my inverters. And I think BT is on by default. I do not need activate it before using. Walls and other thing between android and PIP, cause lots of signal loss... ...
by weber
Tue, 09 Jul 2019, 09:43
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 161
Views: 12027

Re: PIP-5048MK inverter

anyone know of a protocol manual? i would like to see if i can read out the daily, monthly and yearly production/usage. With help from Coulomb, it looks like the command could be "QLD" which might stand for Query Logged Data. It returns 10 numbers. I'm guessing the last 8 might be: daily PV kWh dai...
by weber
Tue, 09 Jul 2019, 08:58
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 161
Views: 12027

Re: PIP-5048MK inverter

affer wrote:
Tue, 09 Jul 2019, 03:21
anyone know of a protocol manual? i would like to see if i can read out the daily, monthly and yearly production/usage.
Please ask MPP Solar for the PIP-5048MK Communications Protocol Manual, then post it here for the benefit of all. They had no problem with supplying it for the PIP-4048MS.