John Frum
Tell me your problems
- Joined
- Nov 30, 2019
- Messages
- 15,233
Interestin
Interesting, on the Klein website you can compare and they had a PDF that compares them and the 390 does not have the inrush option.
Interestin
Interesting, on the Klein website you can compare and they had a PDF that compares them and the 390 does not have the inrush option.
I mean instead of buying another 4 cells to make 200 ah now I have to use them to make a 24 v 100 ah battery.
You only need the in-rush feature for the ac side.
400 amps dc wouldn't begin to cover the dc in-rush of a 4000 watt inverter .
To measure the in-rush of a fridge 50 amps is probably plenty.OK, that helps, how many amps would work?
To measure the in-rush of a fridge 50 amps is probably plenty.
For the ac side you the in-rush of your inverter is not practical to measure.
If you were to make the 12 volt system you've been planning on the largest dc clamp I'm aware of 400 amps so that is just barely big enough.
My Klein cl390 does 400 amps, but I've not really used the in-rush measurement on the dc side.
That should work fine.Another question, if I put a 1500 watt inverter on a 12 V system but don't draw the full 1500 watts (probably more like 800 or less) from basic electronics like router, modem, laptops, and monitors, will that be too much? I figured a little under 600 watts in my home office for the stuff I use every day. There are other things in the office, but they aren't used every day or I know they are just too much for at such a small system.
I ask because I already have a Samlex 1500 Watt Inverter, a Midnight Solar KID Solar Charge Controller, and 5 315 Watt panels (not setup yet).
Holding any lithium cell at it's maximum voltage for a long time will slowly reduce the cell capacity. A few days is no problem, a few weeks, might do a little, a month or more is getting bad. They are best stored close to 50% state of charge. Almost no degradation, and also very little self discharge. They can stay at 50% charge for several months without a problem. Maybe cycle them a bit every few months to make sure they stay balanced and end up close to 50% again. If you have a power failure, you have that 50% left to run on until you have the sun on the panels to charge it up again. My home backup battery is cycled every day, only holding at my full charge (about 88%) for an hour or so before the system starts feeding power to my house. It then rests at close to 50% all night (up to 9 hours) until it charges again after the sun is up.
NoAh, cool, good to know. So is your BMS set to cutoff at 50%?
No
BMS is set for 10V low voltage disconnect as a last line of defense against over discharging your battery.
Use another method of charging to 50%
I think some of that data is old but could still be valid. Anyways we will find out because I am floating my EVE cells at apx. 3.390 volts. I do plan to cycle them at least monthly.Holding any lithium cell at it's maximum voltage for a long time will slowly reduce the cell capacity.
The sellers who actually test use test jigs capable of testing many cells at a time. I don't know which sellers have them. Cells are supposed to be stored and shipped with a 50% or less SOC. From what I have seen most here have received their cells with a 40% to 50% SOC, as did I.I wonder how the cell sellers store and or charge the cells...
I think some of that data is old but could still be valid. Anyways we will find out because I am floating my EVE cells at apx. 3.390 volts. I do plan to cycle them at least monthly.
My application is tied to a UPS and I can't adjust the float voltage. I read somewhere on another forum of someone basically doing the same thing and is floating his cells at 3.4 volts. He said he didn't have any appreciable loss in capacity or something like that.
The sellers who actually test use test jigs capable of testing many cells at a time. I don't know which sellers have them. Cells are supposed to be stored and shipped with a 50% or less SOC. From what I have seen most here have received their cells with a 40% to 50% SOC, as did I.