Search found 2678 matches

by weber
Wed, 29 Jan 2020, 11:24
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 72
Views: 30806

Re: Weber & Coulomb's LyteFyba BMS

LyteFyba can be modified to work with LTO cells without any artwork changes, only component and firmware changes. The 1N4004 reverse protection diode can be replaced with an ultra-low forward voltage Schottky (although this may only have 20 V to 60 V reverse withstand). The voltage regulator should ...
by weber
Wed, 29 Jan 2020, 11:05
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 72
Views: 30806

Re: Weber & Coulomb's LyteFyba BMS

Your use of a low cost optical fibre is interesting. Adds about $30 to total cost? no problem with that. What is the main incentive to use this, the high volt isolation - then noise immunity? You got it. High voltage isolation and noise immunity. The additional cost depends on how many fibre hops y...
by weber
Tue, 28 Jan 2020, 13:07
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 72
Views: 30806

Re: Weber & Coulomb's LyteFyba BMS

Are they going to have a second life as house bank? Yes. Regarding Brisbane weather and 5C discharge.    • What's you thoughts on battery cooling? Great idea. One theory says you can double the calendar life of pretty much any battery chemistry by lowering the temperature 10 °C. It's usually just t...
by weber
Tue, 28 Jan 2020, 12:30
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58741

Re: Low cost BMS

The induction balancers we use switch off once the cells are within 10mV and don't switch back on until the differential is greater than 100mV. Ah yes. That was the other reason I told my customer/friend that these balancers are useless for LFP. One cell could be at 80% SoC and 3.33 V and its neigh...
by weber
Tue, 28 Jan 2020, 10:51
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 72
Views: 30806

Re: Weber & Coulomb's LyteFyba BMS

Very nice guys, how did you go the PCB material compressing and loosening connections? Not an issue? That's right. Not an issue. We're currently about half way through replacing all the cells in the MX-5 (but reusing the CMUs). The 218 cells have been bolted up for 7 years now, and travelled 23.5 M...
by weber
Mon, 27 Jan 2020, 18:48
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58741

Re: Low cost BMS

Alternatively, the master can tell the CMUs what the average cell voltage is, and they can all bypass at that voltage, provided that voltage is above the rested 98% SoC value. Ah, now that is interesting. And something that I could implement... In my case the master tells each CMU when and how much...
by weber
Mon, 27 Jan 2020, 17:28
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58741

Re: Low cost BMS

The cheap inductive balancers I saw, always worked over the whole voltage range. There was no way to tell them to only work above a certain voltage. If there was a sufficient voltage difference, they shuffled charge. But yes, if you were designing them into your own CMUs you could make them work for...
by weber
Mon, 27 Jan 2020, 13:04
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58741

Re: Low cost BMS

Good point about these inductive charge-shuffling types of balancers, which seem to have become available recently at low cost. Somebody asked me about them recently. I pointed out that they would be worse than useless with LFP cells, for the reason you gave. But they might work OK with NMC cells (o...
by weber
Mon, 27 Jan 2020, 10:10
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58741

Re: Low cost BMS

Coulomb and I have packets with CRCs in our system too -- containing various commands and their responses. But every module still forwards every byte the instant it receives it. So the latency is only ever one byte-time per module. When the packet is complete, if the CRC doesn't match, the packet is...
by weber
Sun, 26 Jan 2020, 14:31
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2546
Views: 518905

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

That's what we like to hear. :) Thanks @daimyo.
by weber
Sun, 26 Jan 2020, 14:29
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58741

Re: Low cost BMS

Hi Andrew. What do you mean when you say Coulomb and I break it up into smaller groups? Our BMS is strictly daisy chain, like 4Springs'. The only reason we have two strings of 109 CMUs in the MX-5 is that we have a separate charger for each half-pack. We have a 15 Hz update rate. The rate is not aff...
by weber
Wed, 22 Jan 2020, 22:35
Forum: Renewable Energy and Storage (Non-EV)
Topic: Nickel Iron Batteries real data
Replies: 27
Views: 1676

Re: Nickel Iron Batteries real data

Yes, the iron and nickel hydroxides will turn to carbonates after they have been exposed to air for long enough, same as the potassium hydroxide.
2OH⁻ + CO₂ → CO₃⁻ + H₂O
by weber
Wed, 22 Jan 2020, 14:39
Forum: Renewable Energy and Storage (Non-EV)
Topic: Nickel Iron Batteries real data
Replies: 27
Views: 1676

Re: Nickel Iron Batteries real data

That mud is most likely a mixture of iron hydroxide and nickel hydroxide. Potassium carbonate is highly soluble in water. It won't be precipitating out.
by weber
Tue, 21 Jan 2020, 07:45
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048MK inverter
Replies: 186
Views: 16989

Re: PIP-5048MK inverter

Do you know if there is a command which will reply with the generated energy (as available on the display)? No, there are no such commands in the versions of the MK/King firmware that we have seen so far. Suorama's post with an infini protocol manual suggests that the commands, if they are ever imp...
by weber
Wed, 15 Jan 2020, 12:22
Forum: Renewable Energy and Storage (Non-EV)
Topic: Axpert mks vm2 error code 51
Replies: 6
Views: 897

Re: Axpert mks vm2 error code 51

eng.bajes wrote:
Wed, 15 Jan 2020, 03:03
i have a problem with my axpert vm2 5kva device , it shows error code 51 and then turning off .
what the electronic component can cause this failure ?
I suggest using the forum search to search on "error 51" without the quotes. There many posts about this in other topics.
by weber
Wed, 15 Jan 2020, 12:13
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 187
Views: 17729

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

LiFePO4, was, possibly, a better option. :roll: I though they may not last as long as NiFe. Who knew? Even good quality LiFePO₄ will definitely not last as long as good quality NiFe. I have a fair amount of manuals for NiFes. :lol: Of course. That was for others who might be reading along. To show ...
by weber
Wed, 15 Jan 2020, 10:26
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 187
Views: 17729

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

Hi dRdoS7 , Yes, NiFe is an unusual case, due to the huge hysteresis between charge and discharge. I see recommended absorb and float voltages of 1.65 V and 1.45 V per cell, so yes, I think 38 cells would be a better choice than 40 cells. You should still be able to get most of the charge out of the...
by weber
Tue, 14 Jan 2020, 11:11
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2546
Views: 518905

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

I have tempered my earlier conclusion that the 64 V variants of these inverters are an abomination. See this post in a different thread.
by weber
Tue, 14 Jan 2020, 10:57
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-5048GE, PIP-5048GK and PIP-5048MG inverters (with unsafe SCC)
Replies: 187
Views: 17729

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

I'd like to retract, or at least modify, what I wrote here . When I wrote that the 64 V variants are an abomination, I was thinking as an electronics designer. I would never design something like that — a 48 V sine-wave inverter that clips below 48 V. But hey, we're not buying these inverters becaus...
by weber
Tue, 14 Jan 2020, 09:37
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 23016

Re: PIP inverter repairs and hardware modifications

I suggest replacing the DC-side bypass capacitors with longer life units. Thank you coulomb. How can we identify a longer life capacitor? What are specification? Please explan with detail. I agree with what Coulomb says, but would like to add a few things. I prefer to call them the "battery-side DC...
by weber
Sun, 12 Jan 2020, 09:54
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58741

Re: Low cost BMS

Coulomb and I have had good success with Electrolube HPA conformal coating on our cell-top management units. It doesn't add much to the cost.
https://au.element14.com/electrolube/hp ... %20coating
by weber
Sun, 12 Jan 2020, 09:42
Forum: Admin Notices
Topic: Online membership form
Replies: 4
Views: 223

Re: Online membership form

Chris, I believe Dylan is referring to the AEVA web site, not the forum. Only Rob can deal with that.
by weber
Mon, 06 Jan 2020, 21:21
Forum: Batteries, charging, management and monitoring
Topic: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale
Replies: 382
Views: 57297

Re: Arvio 3.5kWh drop-in-battery-replacement supercapacitor on sale

Hi gyrovague . I know of no other threads on this topic, in any other forums, apart from the few already linked above: Whirlpool, South African Power Forum and DIY Electric Car. I know of no further evidence. But I also don't think any is required. The voltage versus charge curve, and the overheatin...
by weber
Sat, 28 Dec 2019, 10:20
Forum: Renewable Energy and Storage (Non-EV)
Topic: Interworking a Sunny Island with a Redflow Flow battery
Replies: 10
Views: 412

Re: Interworking a Sunny Island with a Redflow Flow battery

hyphenated Welcome to the forum. Can you explain why you say, "I find the use of Lithium chemistry for a daily charge and deep discharge absolutely idiotic, and am prepared to pay a premium to get something with at least ten years of functionality." There are 5 or so different lithium chemistries r...
by weber
Mon, 23 Dec 2019, 11:22
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 30
Views: 2667

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

Wow. Thanks for that, Patrick. They could hardly have got it any wronger. If you're an RACV member, it would be good to email them about it. I'm sure they don't want to be wrong any longer than they have to. At least they got megajoules right. :)