Recent content by mrevesz

Yes I got my prismatic LiFePo4 cells about a month ago. I assembled them with a BMS and have them installed now. I can't really vouch for the capacity of the cells. I feel like it may be quite a bit lower than advertised, but I'm not sure because I am using conservative cutoff values to stop...

You may be looking at an RJ9 connector as at least mine uses this non-registered connector rather than the RJ12. So you will find it does not plug into regular RJ12 female jacks.

The idea that if SHTF you can make your own lye and replace the electrolyte.... while technically true... I would say you could just buy a big box of lye for $20 and sit that next to the battery and you'd have your electrolyte for the next 100 years. They are an interesting battery...

How much power is copious power? 1000w, 2000w, 5000w? more? Do you require load dumping(for heating or anything else)? If so don't go with Victron Energy because they only offer that in the very expensive models or you probably have to buy some expensive add on thing to get that feature.

Yea my inverter has a pretty weird switch. Turns out this may be the hardest part of the arduino setup I'm doing is figuring out how to get the arduino to properly communicate with the inverter.

That looks pretty sweet. Was that from AliExpress?

Yea I would be wary of that. For it to offer both charge and discharge at 100A it will need twice as many MOSFETs as a similar rated common port BMS. I would compare the price between the common port version and the separate port version. If it really has double the amount of MOSFETs, then...

Hello. I am trying to design an arduino circuit using one of these BMS from aliexpress. I plan to not pass current through the MOSFETs but use them as a signal to tell my arduino when they are open or closed. I intend to send 5volts to the positive and read the negative on a digital pin of...

Yes I can do that. I will be checking the voltage of each cell as well. Hopefully they included bolts nuts and bus bars for the terminals.

Opening up the box? I'm getting raw cells. So the only way to open them up would be to start taking the cells apart.... which I certainly will not be doing lol

Yea I will let you know. To be honest I don't plan on doing an amp hour test or anything like that. I'm new to this stuff and taking it one step at a time. But I will let you know if I get dinged on customs charges, and if I'm impressed with the overall packaging, and appearance of the...

I'm going to be implementing arduino into the off-grid system I am building. The arduino is needed in my case for a few reasons: 1. I want to be able to use the BMS as a switch to turn off the inverter, but my inverter requires a pulse signal to turn on and off so I cannot use the mosfet...

You did some funny math there... You calculated the watt hours of a 12.5ah cell. The cells are 200ah. The specs are for a single cell, and the ad is for a lot of 16 cells. I went with the same product but only 8 cells. So 5.12 kWh for $1074 That's $209.77 per kWh. Not too bad. It seems a...

hmmm. Well Aliexpress was dragging their feet on verifying my purchase... So i started shopping around. DHgate actually called me yesterday and I was able to confirm with them my purchase. Big price difference between the two offerings, so I guess I can expect to have to make up for that in...

I imagine if you crack one of these MPPTs open you've got a transformer with half a dozen or so leads sticking out of it. The controller decides which lead to pull the current from depending on voltage etc. and open and closes mosfets to allow that to happen. So long as you don't exceed the...