Recent content by vk2emp

Buy yourself a couple of hobby chargers and a DC electronic loads. The ones that look like a computer heatsink with a PCB will do just fine and arent expensive. I have a pair of ISDT chargers that do 30+ amps into a 3.2v LFP. You can get wall powered ones though, I have a 40Amp DC power supply...

I have an old analog scope, otherwise I'd do the same - its just not great trying to capture something with a scope that so old it has a CRT :P Should invest in a Rigol or similar (one of the hackable ones - I like tinkering as we all do :) )

6kW is a scary amount of power - I'll stay around the 2kW level here - but I'm only powering servers and other stuff, not a sailboat with an electric drive :) Because I have a house based system and live in Australia, I usually have sun (not today - raining) and shore power, so I can always...

Then you divide it - get a 1kW dc electronic load and simply divide the runtime down by 6 to get the average runtime of 6kW. Then subtract 20% to give yourself a saftey margin. I am charging a 150Ah 12V LFP using a 32V power supply simulating a solar panel into a smart solar 150/35. At 20 amps...

The proper way to test batteries to get a true idea of capacity is wirh a dc electronic load - I have a small one which does around 500W, but those batteries Madi has would take days at 500W, possibly even weeks with the "Big Battery" stack. Basically you want to do a constant current, and set...

Fridge inrush current - over many cycles it eventually blew the output fets.

hey Madi! Greeting from the other hemisphere! I haven't been on these forums for a little while - just saw the funny video where you popped one of your buck converters on your "big" battery. So looks like we're even so far - you've exploded a fuse and capacitor, I've popped a few fets in DAlLY's :)

Highlly likely, it'll be wired as a low pass filter to remove harmonics and high frequency noise from the waveform. The parts need to be rated to take the full power of the ups - Assume the ups is rated to 3000VA peak power, the parts will probably be able to take 3500-4000VA before they begin...

The BMS doesn't limit charge current. What you do is place something (such as a raspberry pi) in between the bms and the charger (assuming the charger is a smart one (Victron is an example), which instructs the charger to throttle the current. Now I might be running a Batrium on my house...

The batrium doesnt have one, unless you have the shunt but that is on the DC side. The shunt (500A or 1000A) will tell the batrium if the pack is being over drawn. The beauty of the batrium is, with the right setup, you can program it to say "No little inverter, no, turn off NOW" by using the...

Thats how we learn. I watched Madi (The Digital Mermaid) on youtube short out a 48V 280aH EVE pack, and it made me jump. I'm very cautious around my batteries, and never had a problem. A mate was visiting while I was re-arranging my 260ah 48V LA pack and he came over (having had a few beers, me...

Oh you just brought to my attention something I DID NOT FACTOR, and its something I already know when firing up an inverter. Inrush current. This "pulse" of energy can be magnitudes greater than what the appliance wants. Its not just capacitors that do this, motor stall currents do it as well...

Yeah I'm getting this. Unmarked connectors, "you need to do this coz yours is that model" and the LOUD BANG when they die has put me off them. The "Blue box" one I bought was a chargary, but it was just a monitor, and 7S plus, I didn't see that in its specs, nor its inability to balance. I'm...

I blew up a 100A Daly bms by over drawing it - we're talking a 12V circuit here, so bought a 250A unit. During operation from my CALB pack, the 100 did a fine job of what was expected of it, then I plugged in my fridge. I have a 1200VA Victron inverter that powers my experimental system before I...

Good stuff - I'll start playing with my 2 12V Daly's on a 40A Headway pack and a 180Ah Calb pack :)