Recent content by Sverige

It’s not often we in Europe get better pricing than the US. Those guys at 18650 seem to be making the most of end users not having fully caught up with how much the producer prices have dropped, and must have jacked up their margins compared to last year.

MB31 314Ah cells showed up on Nkon.nl today on preorder for delivery end of June. €92 each plus shipping which is €8 more than I recently paid the same vendor for LF304K cells. https://eu.nkon.nl/rechargeable/lifepo4/prismatisch/eve-mb31-prismatic-314ah-lifepo4-3-2v-a-grade.html

According to the second line in the chart of my Google lens translation of this slide from the 2023 “Senior Engineer Lithium Battery Conference” in Guangdong China, (Oct ‘23), down to 0.35-0.38 yuan per Wh ($48-$52.5/kWh) by the end of this year and a modest drop to 0.34-0.36 yuan per Wh ($47...

Very easily and cheaply done with any type of smart home power switching socket adapter. I would use the Tuya range such as this https://expo.tuya.com/mobile/product/1075057 Together with a Tuya lux sensor can be programmed via Smart Life app to switch on only when full sun hits your solar...

Yeah I completely agree and I have no qualms about paralleled cells discharging at slightly different rates then catching up later in the discharge curve, but with potentially a 4X IR mismatch I am thinking the imbalance in this case might be more than just “slightly” different and hence giving...

For batteries of the same or similar IR, it’s considered best practice to diagonally connect load tap offs as shown in option A diagram below, but what is the best approach to manage paralleling of batteries with significantly different IR? I have Lishen 272Ah cells with a spec sheet IR of...

Great work!

It’s watt hours which count, and here in the winter when bulbs can be on 18 hours a day, efficiency improvements really help. But different things are important to different people!

The “best” LED bulb I want is the one isn’t one which looks like an old fashioned bulb, it’s one which will be most efficient. I keep replacing my bulbs at home, each time ikea LED lamps evolve into a more efficient variety. 1.8W for 250 lumens ikea “solhetta” is about the best right now but one...

I just pressed the button on 8x LF304 from Nkon.nl, since they’ve dropped their price on preorders even further during the past month since I last checked. Now down to €84.95 per cell on 8 cell quantity with busbars, only a couple of euro more than the LF280k v3. I went with the bank transfer...

Yes it’s an option. I could reconfigure my main battery bank to 8S, but then I have to replace my 12V inverters or I could use a suitably sized Buck boost module to just raise the transmission line voltage then convert down again, local to my loads, but all these converters have a quiescent...

It’s a nominal 12V (4S LiFePO4) system.

Reading the spec sheets for each tells you this. The 280Ah cell is rated for a longer life at a lower charge and discharge rate and is therefore the best pick for home energy storage imho

Those spam guys really helped us out!! 😁

I also think that after this year’s price dip, the longer term factors will drive prices back upwards. Timing a purchase decision correctly will be a good trick to pull off.