Recent content by SolarRat

Leaving them on, shutting them off, and a combination of the two. On one battery, I tried the bench power supply I from 200ma to 3 amps . On the other battery I just let the 10amp charge controller do its thing. After a while with 10amps the bms would just trip and stay tripped. Unplugging...

An amp hour test won't really tell us much, because we still don't know how many amps the cylindrical cells are. For all we know they could be grade B 6amp cells * 20 = 120ah, but with such poor balancing they sell as a 100ah battery (lifespan will be very short if this is the case). Some of...

That reviewer is an idiot. A three stage charger has absolutely nothing to do with boost mode or de-sulfate mode. That charger IS way overpriced, but that is a different topic.

No, no it doesn't. At all. It has nothing to do with PWM's, just that particular PWM. There are plenty of good PWM's out there, and many pieces of junk also. You are blaming an obvious BMS issue on PWM? There are many cases where a PWM will outperform an MPPT. Use the right tool for the...

Has anyone got these boards to do a damn thing? I wasted enough time with these crap batteries. I just deleted a long rant post, but I gotta tell ya, I'm pissed.

It sounds to me like your BMS is disconnecting the battery terminals, so the charge controller is going to open circuit voltage. Usually when this happens it bounces back and forth between high and low volts while all your loads freak out. Switching to a MPPT in this scenario won't help...

That is your charge controller switching from constant current to constant voltage, not the bms.

Are the batteries cutting off, or is the inverter cutting off? Either way, why run them that low?

Wild's explanation makes sense. Another reason might have to do with the way lithium cells behave when nearing full. On a lead battery, the higher its voltage goes the harder it is to increase it further. On a lithium cell, once it reaches a certain voltage it will quickly increase in voltage...

Exactly! But many people seem to not be aware that this is not normal, and the lifespan of their CC and load will probably suffer. The onboard meter is wired straight to the pack? If so, it should read higher than my Flukes on the terminals, but it reads lower on both. Regardless, those...

The onboard meter is very inaccurate. The battery posts are after the BMS also. If you disconnect the balance leads from the BMS, the battery output goes dead. Now, with this balancer board installed, instead of 1 connector there are 4. If any one fails the battery goes dead (my boat is...

This is the main problem, and very damaging to the entire system. The battery is disconnecting from the charge source and the load. Neither like when that happens. Yet many here seem to think it is normal.

Right, but that is what scares me. If ALL cells above 3.45 get shunted to ground then any charge above 13.8 is creating a tiny powerful heater inside the battery. If someone charges to 14.6v, that poor little balancer will cook away for weeks. There must be some parameters that must be met...

I wonder what happens when a fully balanced battery reaches 3.45 per cell. I guess there must be a certain voltage differential between cells for it drain a cell...well, I'd hope! I wonder what that differential is? 100mV? Yikes. Yes, I'm using a bench supply and feeding .25-.5a. It doesn't...

Agree. I planned on only charging these to about 13.8v max but that probably won't trigger the balance. 14v it will be. I guess it does make sense, so a low battery is not wasting energy balancing...but 3.45 is a fully charged cell. Maybe an adjustable "equalization" charge setting some LA...