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As it stands now, I think I will have 4x 24v (2p8s) batteries in parallel. I need one relay for starting a generator and 2 more relays for activating SOC operated devices.

I did look at this but it only has one relay. I guess I could get three if I could use a single shunt but I don't see how to do that in the documentation.

You are right that bluetooth and user friendly apps are needed but I can not control relays with those apps. I was thinking of making a device that could read a CAN buss or some other serial output that would give me access to SOC and close an appropriate relay but that would require a lot of...

Right now I have about 1700A/hr of FLA batteries and this will get me through maybe 2 cloudy days if I'm conservative. Currently I would need 2 SOC controlled relays plus one dedicated for the generator. Using voltage set points does not work well with lithium batteries because of their...

Thanks for the link, 8p is too much. As for going to 48 volts, I know that would be better but the 24 volt system I have runs more than just 2 inverters. I also have a pressure pump and other devices connected to it. I do like the 2p8s approach but I would need more than 1 output for gen start...

I don't want to replace my inverters and very expensive lightning protection to handle the higher panel voltage. I did think of that though.

Hello all, I am considering making a large (2200 A/hr) 24v lifepo4 bank but I am having a problem finding compatible BMS monitoring to connect to my existing system. What I have now is 2 outback inverters and 3 charge controllers with a large FLA battery bank that will need to be replaced in...

Inverter? Diodes? I was planning of switching in a resistive load across the panels to soak up power when the output power on the SCC was at max. The Outback charge controllers are slow at limiting output power when presented with an edge-of-cloud event and could surge to problematic levels...

As I said before, my system is set and not able to add a second SCC. I found the over-paneling guide you mentioned and it does not name my Outback FM80 SCC. I understand if the FM80 fails and I exceeded the 2000 watt max input, I void my warranty. This is why I am asking. I know 10% is not that...

The Outback FLEXmax 80 is rated at 2000w max solar input for a 24v output at 80 amps. I am running 2220 watts into the FX80 which is 220 watts over max. I have read that this is bad for the SCC. This system is configured as is and can not be modified for another SCC and you are correct about the...

Hi all, I may have a problem with my setup. What I have is an 800 a/hr 24 volt fla battery with a FLEXmax 80 charge controller and 6 370 watt (REC N-peak 2 black series) panels totaling 2220 watts (STC) solar input. I have read about over-paneling and I was wondering if I need to take some...

I am going to use an Orion Jr2 BMS on a 36v golf cart and need some help with the settings. System info: 36v battery bank made of 24 Fortune 60 amp cells in a 2p12s configuration, Dakota Lithium 18 amp charger @43.2 volts. What I want: 90% maximum battery charge and 20% minimum charge with...

This is where I got those numbers. I would probably use something like 90 to 95-20 or so

Got it, thanks.

Great. I am slowly figuring out these batteries. One more thing, if I use the 20-80 parameters, would I do a top balance at 80% or the whole 100%?

OK Ampster, I get it. Drift would be used when you don't fully charge the battery on a regular basis. A SOC meter will do the same thing, right?

I do not need the data logging feature but the "fuel gauge" type display would be useful. My use usually would be drive the cart around for a day then charge it. With the FLA batteries I have now I never go to the 50% SOC point anyway. Which gauge are you referring to that will display amp-hours?

The Orion has an add-on indicator that will show SOC but it seems that there are a few variables to set to make it accurate. Some of the settings I do not understand are "Derate CCL for temperature" and "State of charge drift points". I would assume that these adjustments are there for accuracy...

Ampster, my existing charger will do 42.5v absorb but after a time the charger goes into an automatic EQ cycle and goes to almost 50 volts. I am not sure I can adjust this charger for a fixed voltage without the EQ cycle. Question, can the Orion BMS let me know if a cell high voltage limit has...

Ampster, I think I meant charge to 3.6 volts per cell and yes, I'm planning a 2p12s configuration. I will be looking for a LiFePO4 charger when all is said and done. Actually I just unboxed my new Fortune 60ah cells and measured the voltage, each cell is 3.289v except 1 and that was 3.288v...

I was worried about the Daly voltage setpoints too. I cancelled the order for the Daly and am now looking at an Orion Jr 2 BMS. Thanks for the tip.

Thank you both very much for this information, I have been using FLA forever and I am used to their charge characteristics but Lithium is new to me.

So you are saying this is ok for me to charge to 3.6v. I can live with that. The Daly bms I have will cut out at 3.75 volts so I guess that would never be reached with the charger I have. Just for fun, would 3.75v damage the battery if occasionally charged to the level?

Hello, I'm new to LiFePO4 battery charging and have a question. I am converting a 36 volt golf cart to Lithium and have decided on the Fortune cells. They say that the max charge voltage per cell is 3.65v but my charger will only get to 3.6 volts. What effect with this have on the battery as SOC...