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Electrodacus - Active BMS - opinions?
#1
Hi, guys,

does anybody has experience with this active BMS?

http://electrodacus.com

What other active BMS would you recommend and would it be even suitable for our DIY projects?

Any input is welcome :-)
There is an urgent need to stop subsidizing the fossil fuel industry, dramatically reduce wasted energy, and significantly shift our power supplies from oil, coal, and natural gas to wind, solar, geothermal, and other renewable energy sources. 

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#2
It looks like it will only do parallel arrays, the max pv input is 45 volts. This is for large pv systems where all the panels are in parallel. For 1 or 2 panels you can find cheaper controllers. In the manual I notice that the balancing current is only 200ma, just a little better then the balancing done by many of the BMS built in balancers. So this electrodacus controller will not work to well with a battery that might have balancing issues, it will charge it but once a cell reaches a high point it will stop fast charging.

What I found out, if you use "active balancers" , all you need is the controller to control everything, the overvoltage relay and battery BMS can be the last line of defense in case something fails. Its how I been charging my 110ah 4s DIY battery for the past 6 months. It works so good I no longer worry about the lithium battery getting overcharged. The active balancers can balance at up to 10 amps each, on a 4s system there are 4 balancers. They work great on a battery that might have balancing issues. You can hit the battery with maximun amps almost until it reaches 100 percent. My 4s active balancer cost me 90 dollars, worth every penny. They sell them for larger series batteries also, and they work with either li-ion or lifepo4, electricarpartscompany has them. If you can keep your pack in perfect balance any controller will work. Overvoltage relay and BMS are just insurance in case the balancers fail.


The overvoltage relay you can adjust it so it disconnects the panel when the battery voltage reaches 14.4 volts (4s lifepo4 max voltage 14.6). The overvoltage relay only works good if the battery is in perfect balance. And in my system the overvoltage relay is used as a backup, it hasn't activated in months, just adjusting the controller to switch to float at a certain voltage will work everytime. My 240 watt solar panel can max out at 14 amps output and the active balancers will easily keep the battery in balance.

As much as possible you need to avoid for the Battery BMS to activate and stop the charging, this will cause voltage surges that will destroy anything connected to the battery. Thats another good reason for the overvoltage relay.

active balancers,  without the balancers one of the cells would be reading 3.60 volts which will activate the BMS everytime and keep the battery from getting a full charge especially when charging at high amps.


how I got my system setup, thats the controller I use ecoworthy 20 amp mppt, its 5 years old and I used it to charge lead acid, now doing lithium, the beauty of those 100 dollar controllers is all parameters are adjustable from the 4 buttons on unit itself. With active balancers no need to get a "lithium" ready controller.
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