Recent content by me3

I have a friend wants to do a ~12v 300ah pack for his van. Whats the simplest to configure ~200A BMS to recommend?

I want to run a high current motor for 5-300 seconds, within the C rating of the cells. Lets say 100AH cells @ 3-5 C, so a 500A spike then maybe 150A continuous, with the odd ounce higher. That means a BMS that can handle 500A. This is easy with a Solenoid, difficult with a FET setup. Who...

Consider them in series with one boosting the other if your loads are controllable. Means you can shut one down, and no complex integration for parallel. When configured in Parallel you cannot run only one. Read the wire sizing docs very carefully, it's how they balance the AC load between them.

Advantage of Winston is you can build a 4s or 8s or 16s pack in the capacity you want, no parallel issues. Most others need parallel.

I bought one. Summary is for 48v it works well. Not silent but much quieter than AIMS junk. Seems to get about 1.2kw on 110v with good voltage profile. Again, much better than AIMS. I was hoping to hold 1.7kw, but it wont do that on US voltage. Gotta be careful with the IEC cord, as cheap one’s...

Very interested in your results. I had the AIMS - it was terrible I have had other good Meanwell stuff

Has anyone tried the MEAN WELL NPB-1700-48 I have some industrial experience with Meanwell and their stuff is bulletproof. https://www.meanwell.com/Upload/PDF/NPB,NPP-E.pdf I had an AIMS 25A 48V charger, and it was terrible. Super noisy cooling, very hot and always pulling back to <50% charge...

Due to space constraints, I'm considering stacking 8 Eve (or similar) cells on their sides and stacking vertically. 2 towers of 8 = 16 cells = 48v system. Has anyone a) Run their cells sideways? b) Stacked 8 high? I figure the stacking is the same as compression. That should be fine...

If it's switch mode (ie. feels light, not heavy), then it will be much weirder than that. They tend to draw weird harmonics from the peak voltages to charge the supply capacitors through the rectifier. Means often the cycle is almost no current for 70% and only drawing current for 30% or less...

It your fan noisy (fast speed)? And sometimes never slow down / shut off when charge finished (stay noisy) At the full charge rate - how much heat comes out? Does the charge rate slow down to about 50% after 30mins due to heat?

36/48 48v system

I have one of those. It's terrible. Noisy, slow to charge and produces as much heat as is does charge. Always heat limiting it's output, with the fan going nuts. It's in the same room I am. Near match for the Victron color scheme. Not much else.

Have BMS / CANBus This is the insurance when that goes wrong.

On alternator disconnect due to BMS opening (or other reason), the inductive voltage spike kills rectifiers, regulator and other things. 48v nominal has no protection devices on market. One solution is hard wired lead acid in parallel, but 4 batteries is heavy. What about a ~100V supercap...

All feedback says it's difficult to get any device that clamps / dumps very rapidly at over 56v and less than damaging (say 80V or so). Doesn't sound hard, but seems to be so. I'm thinking now about putting Ultracapacitor array inline, that would soak up a lot. I just need to find one that has a...