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Simple voltage shunt circuit to balance LFP cells. R8 and R9 sets shunting threshold to 3.45V and placed away from heat generating parts to reduce voltage drift. Shunting current should be around 0.38A should be enough to keep 100A cells in balance. Single sided PCB no holes or vias, easy to...

So thanks to @Sharing Society I got my hands on couple of fried BMS boards from EG4 Lifepower4 48v batteries. One of the mosfets labeled SVG104R0NS (120A 100V) got so hot it scorched the pcb. I desoldered it and amazingly this mosfet still works! Next I tried to power up the board but I could...

So i was doing annual cleaning on my Midea U 12kbtu window AC and decided to take it apart a bit more to see inverter/controller board and to try running it from DC power. I tried to power it from 120v 100ma benchtop supply and i got it to spin the indoor fan followed by power error displayed on...

Panels arrived. 2 out of 18 damaged. Will do some testing after I clean up the mess. Damage claim reported to Signature Solar.

I came across this Rondo Heat Battery storing heat in bricks at 1500C and it got me thinking. One regular brick weights 2.3Kg, has 1000J/Kg/K specific heat capacity (0.278Wh/Kg/K) and costs $0.50 in bulk. Heated to 1500C one brick stores 0.278*2.3*1500=959Wh of heat. $0.5/0.959=$0.52/kWh(t)...

After looking at the prices for compressor soft starters I wonder how hard would it be to make one yourself. After some research I found this circuit diagram of Triac based soft starter. I know there has to be start winding phase delay capacitor that needs to phase shift it by 90 deg. Does any...

Inspired by this thread I decided to test it myself. I happened to have this big toroidal transformer core sitting on my desk that happens to be an excellent source of 400 Amps AC as high as my clamp meter will go. So I crimped two #4 lugs on 4 AWG welding cable, looped it through the core and...

Which stand alone (not battery integrated) BMS will communicate with Growatt 5000es over CAN or RS-485? Daly does not work. Signature Solar has no idea. Will Seplos 3 BMS work? It kinda looks like those battery integrated BMS in EG4 batts.

System reduced to 6 panels due to winter shade. Making around 230 watts (1.7kWh) on a cloudy day. Victron MPPT is really efficient at low power.

It appears that forum software recompresses already size optimized images into much larger images after forum URL watermark is added. For example I posted this optimized image of 21 kBytes that got turned into an image of 132 kBytes. Original 21 kB image file attached as .txt

https://wsvn.com/news/local/broward/crews-put-out-house-fire-in-davie-no-injuries-reported/

For sale Victron Phoenix 1200VA 24V inverter with original box. Max output power 1000w AC. Bought new and was used indoors for 1 year in air conditioned space. Works fine, can start 5000 btu window AC. Selling because I switched to 48V system. $300 + shipping extra. Pay via Zelle or check or...

I have 6x 2014 Tesla Model S battery modules in 2S3P config for 43.2V 630Ah configuration at roughly 85% state of health. They are charged by Victron MPPT 150/60 controller maxing out at 60A. I had Victron smart shunt logging battery data for 18 days and the result shows 98.9 % charge/discharge...

Hi, am looking at getting Victron smart shunt or this DROK battery monitor www.amazon.com/DROK-Discharge-Coulometer-Percentage-Voltmeter/dp/B0BR51TB9X I like Victron shunt because it has historical record of battery total charge/discharge energy but I want something stand alone with a display...

For sale Victron Smartsolar MPPT 150/60-tr charge controller. Bought new in 2022 and used with 6x 330w panels in parallel charging 6x tesla model s battery modules also in parallel at 23.4v. Now is used with 2 panels on side of the house. I plan to install panels on the roof with microinverters...

A team at Dalhousie University with Jeff Dahn have identified modified NMC Li battery that can last 100 years and beat LiFePO4 in both efficiency, longevity and energy density. Full paper here: Li[Ni0.5Mn0.3Co0.2]O2 as a Superior Alternative to LiFePO4 for Long-Lived Low Voltage Li-Ion Cells...

Hi, I have big and heavy low frequency 27V > 120/240V toroidal transformer from parted out Xantrex 6048 inverter. I would like to make MOSFET H-bridge inverter and PWM controller to drive it. So far I found IPP016N08NF2S 80V 196A 1.6mOhm MOSFETs on mouser that look pretty good for low frequency...

So I stumbled upon this gem. This Sun Fun Kits guy uses electronic load in constant power mode (!) without V-sense leads (!!) and tried to compare LFP cells. I tried arguing for using Vsense and constant current mode but this guy is adamant. No wonder why battery manufacturers do not deal with...