Search found 2676 matches

by weber
Sat, 08 Feb 2020, 15:32
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2544
Views: 518060

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

Moderator note:
Moved a repair-related discussion of SCCs to the repair topic:
viewtopic.php?p=77504#p77504
Please continue that discussion in the new topic.
by weber
Fri, 07 Feb 2020, 06:50
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 22779

Re: PIP inverter repairs and hardware modifications

Sir the two 1000uf capacitors are connected in parallel with 4200uf capacitors. Here is a datasheet that shows the original 1000 µF 35 V in Lelon's RGA series. They are not a low impedance type, and only have 2000 hour endurance. But since they are across the DC bus of the battery side of the DC-DC...
by weber
Thu, 06 Feb 2020, 05:41
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 22779

Re: PIP inverter repairs and hardware modifications

Most inverter comes with original mosfes K100 and some comes with csd19505.this one was with csd19505. I'm guessing the "K100" are Toshiba TK100E08N which are 3.4 mΩ 80 V. The Texas Instruments CSD19505KCS are 3.8 mΩ 80 V. Those MOSFETs should be fine. There is no need to upgrade to a higher voltag...
by weber
Thu, 06 Feb 2020, 05:05
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 22779

Re: PIP inverter repairs and hardware modifications

@Roman khan, This is my suggestion to replace the 4 x 4200 µF capacitors: https://www.digikey.com/product-detail/en/united-chemi-con/EKZN500ELL332MM40S/565-4081-ND/4843891 Thanks for your kind help once again. Sir these capacitors are 35v 3300uf on my inverter and you have recomended 4200uf 50v, Wi...
by weber
Wed, 05 Feb 2020, 06:44
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 22779

Re: PIP inverter repairs and hardware modifications

[Assuming the King is like the Axpert MKS 5K] If it is a Raspberry Pi A+ or Rasperry Pi Zero with the HDMI turned off, and any other unneeded hardware turned off, so that the average current is less than 170 mA, then you might just barely be able to power it. In that case, the best interface might b...
by weber
Tue, 04 Feb 2020, 13:03
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

As a matter of interest, what voltage is required for the current to increase to an amount that would be regarded a charging current, say above 1 amp or more? Once this threshold has been reached, if the voltage is again dialled back to 3.8v, is the current still only 1.5mA? Sorry Terry, but I've a...
by weber
Tue, 04 Feb 2020, 12:24
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

Yes. As I tried to explain earlier: Both high voltage and high temperature accelerate the ageing processes, one of which is an increase in the thickness of the otherwise beneficial SEI layer, which causes an increase in internal resistance. High voltage alone doesn't cause heating. Current causes he...
by weber
Mon, 03 Feb 2020, 20:15
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP5048MG: 3Phase Configuration: Fault 08 and anomalies.
Replies: 24
Views: 484

Re: PIP5048MG: 3Phase Configuration: Fault 08 and anomalies.

That's great information Revlac . TitchRSA , You could try swapping inverters between phases, to see if the problem stays with the same phase or the same inverter. Others have experienced this problem with PIP-5048MGs (also called Axpert MKS IIs). For example, this post . Unfortunately, the original...
by weber
Mon, 03 Feb 2020, 16:19
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

Interesting, no gassing or cell swelling? Thanks for reminding me. I was interested in this question myself. I deliberately chose a cell that was not already noticeably swollen. I measured its thickness with dial calipers last night before topping it up, as close to the middle of its broad faces as...
by weber
Mon, 03 Feb 2020, 14:52
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 22779

Re: PIP inverter repairs and hardware modifications

Roman khan , This is my suggestion to replace the 4 x 4200 µF capacitors: https://www.digikey.com/product-detail/en/united-chemi-con/EKZN500ELL332MM40S/565-4081-ND/4843891 I understand now, why these capacitors were not where I expected them to be. It's because the battery side of the DC-DC convert...
by weber
Mon, 03 Feb 2020, 12:16
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

T1 Terry , It's possible that some old models of the EV Power CMUs started bypassing at a higher voltage, but the present-day specification clearly states that it starts bypassing at 3.5 V. But I agree that the present-day EV Power spec of not turning on the alarm until 4.0 V leaves much to be desi...
by weber
Sat, 01 Feb 2020, 14:04
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

T1 Terry , Why are you wasting your time telling us not to do things that no one in this thread is proposing to do? No one in this thread is proposing to bypass LFP cells at a voltage above 3.6 V. And no one in this thread is proposing to use the cell as a heatsink for the bypass resistors. I'll be...
by weber
Sat, 01 Feb 2020, 12:59
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

T1 Terry You still haven't told me what to do voltage-wise, to demonstrate internal heating of a cell at minimal current. I note that I am not willing to hold any LFP cell at a voltage of more than 3.65 V, because I know this will accelerate the rate of loss of capacity. Our LyteFyba BMS will not a...
by weber
Fri, 31 Jan 2020, 07:37
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2544
Views: 518060

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

mojo Please post photos of the labels on the sides of the two inverters. Block out the rightmost 6 digits of the serial numbers if you wish. What is the maximum value of setting 26 (when setting 5 is USE) on each inverter? If one is 58.4 and the other is 64.0, then you will not be able to parallel ...
by weber
Thu, 30 Jan 2020, 15:13
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 22779

Re: PIP inverter repairs and hardware modifications

Roman khan Good photos. The capacitors for the battery-voltage DC bus are certainly not where I expected them to be. Can you post a photo of the tracks on the underside of the board. And also post the text on the 35 V 1000 µF capacitors. It's likely that all six of these 35 V caps are across the ba...
by weber
Thu, 30 Jan 2020, 14:54
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

Terry, You sound like you're making excuses as to why you haven't done this experiment yourself. ;) I note that your proposed cell opening, to insert a temperature sensor, would not only require a low temperature, but also zero humidity and no oxygen, if you don't want to damage the cell. But measur...
by weber
Thu, 30 Jan 2020, 14:21
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 72
Views: 30752

Re: Weber & Coulomb's LyteFyba BMS

Would these use optic fibre links or wire links? They can use either optic fibre or wire links. They can also use line-of-sight free-space infrared comms (like a TV remote control, but deliberately reduced in power to work only over typical inter-cell distances). Since the fibre and IR require addi...
by weber
Thu, 30 Jan 2020, 13:19
Forum: General EV Discussion
Topic: How to tell a kilowatt hour from a kelvin week henry
Replies: 30
Views: 2654

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

Here's another fine point of symbol usage that relates specifically to batteries. The relative rate of charge or discharge of a battery is often described as a multiple of its capacity, by using the letter "C". For example a "2C" charge or discharge of a battery with a capacity of 100 amp hours, cor...
by weber
Thu, 30 Jan 2020, 08:29
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

Terry, I'd be happy to test your theory, that voltage, without current, can cause internal heating of an LFP cell. Can you describe a simple experiment I can do, involving say a single (possibly sacrificial) cell, a thermometer, some thermal insulation, a power supply and some multimeters? What volt...
by weber
Thu, 30 Jan 2020, 07:06
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP-4048MS and PIP-5048MS inverters
Replies: 2544
Views: 518060

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

The website https://solarmonitor.enapter.com/ describes a DIN-rail mounted device, currently available for pre-order at €70, that connects to a PIP serial port, and to Wi-Fi, and gives a dashboard over the net, as an alternative to Watchpower. No endorsement is implied.
by weber
Wed, 29 Jan 2020, 21:58
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

Ummm..... the whole purpose of a BMS is to extend the cycle life and retain usable capacity isn't it? No. That's only part of its purpose. Another part is to stop your house burning down. Another part is to extend the calendar life and retain low internal resistance. But a BMS can't control everyth...
by weber
Wed, 29 Jan 2020, 14:28
Forum: Renewable Energy and Storage (Non-EV)
Topic: PIP inverter repairs and hardware modifications
Replies: 438
Views: 22779

Re: PIP inverter repairs and hardware modifications

Yes i mean battery side mosfets,they works for some days and blowing up.i replace them with csd19505 and make all drivers and replace 4427 ic ,but the same result. Mosfet along with driver transistors and resistors blow up. You need to replace the DC bus capacitors that are associated with the MOSF...
by weber
Wed, 29 Jan 2020, 12:06
Forum: Batteries, charging, management and monitoring
Topic: Low cost BMS
Replies: 434
Views: 58662

Re: Low cost BMS

No Terry. Even if my batteries die tomorrow, it won't prove anything about our respective BMSs because there are way too many other variables. I never said there was anything harmful about having 5 amp balancing currents, or the idea of inductive charge shuffling. I just wanted to make sure that oth...
by weber
Wed, 29 Jan 2020, 11:24
Forum: Batteries, charging, management and monitoring
Topic: Weber & Coulomb's LyteFyba BMS
Replies: 72
Views: 30752

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: 30752

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...