Hey trendsetters.. I’m running the victron mppt 150/45.. I’m generally used to getting full telemetry feedback from my previous unnamed competitor controller. previous also had a low voltage cut off protection as it had an output/load port on this one N/A. . . I am trying to get my light off grid system as hassle free and use a friendly as possible.. firstly that would start by having a voltage meter within the caravan which I purchased on its a victron display . Pile of expensive junk. does absolutely nothing. Has a technology and display of a 30 year old wrist watch yet set me back $70 with the cord.. I realise there’ there’s another display Victron offers. So keep in mind this system is for the conservative sensibly budget domestic user. . I’m considering just getting a cheap Chinese Android tablet approx 7” display connecting it via Bluetooth to the controller and just having it mounted on the wall . With the option in the app keeping the display on 24/7. It seems light years in front of the last one. Any other suggestions?? I’ve also gone from AGM to lithium. . To be more precise I have 300 amp hours of storage utilising Renogy 12v cells qty 3 connected in parallel. have a rating of 100 amp . Burst of 300amp . So potentially though un likely to be required 900 amps draw available. . So where I’m going with this… is I need to be able to monitor these cells and have a low voltage cut off or even an alarm in place.. I realise the BMS internally in renogy 12v battery does cutoff. I feel these these numbers are more in the range of parameters implemented to avoid failure due to overcharging or over depletion. And not so much longevity friendly..can’t monitor the output /telemetry through the Victorian since it’s got no output…I’m missing half the data essentially. So obviously I need a shunt I had a victron 500 amp on my shopping list but then I noticed that renogy sells a shunt with a wireless display once again light years ahead of victron though now at a trade off . As I’m not going to have full compatibility/=telemetry data if I take this option.. also my reasoning for being probably more obsessive than others with the shunt and voltages is I live in a 24/7 fully off-grid van 24/7 . And hope to get longevity out of my cells as I only charge them to about 80-90%. And don’t really tax anywhere past 30% if I don’t have to.. what are my options?? Excuse the rant but I’m a little bit disappointed.. also just as a last note I haven’t completed my research I don’t think that that renogy display/shunt has a cut off either and still need another device same goes as the Victron shunt it’s only for monitoring The negative terminal. Wow. If I had a voice in a company like victron.I’d make a few changes.. starting with a few sensibly priced user-friendly devices/displays/cutoffs/smart options to the range . Eventually do the same thing we try to do every day. TAKE OVER THE WORLD. . L
This will work. Loads of guys do similar things on the forum and with live BT data it will be as it is on your phone.
Be careful of this. Cell balancing is important and it usually only happens near full voltage on the drop in batteries.
And cycling is cycling not matter where in the range you are doing it, so really its beither here nor there.
Balancing on the other hand does matter as (total battery) low cut off becomes much higher if there is a cell that is weaker than others causing bms to shut down earlier.
Obviously the only thing that can do individual cell monitoring and report it is its own bms. Unless it has can and you could use a GX. Maybe your tablet could just have the two apps on it.
If you are running dc only loads there is the smart battery protect.
It can either be programmed itself and or used with a shunt aystem and use the relay on the shunt to switch it off and on (sp load control) based on soc.
But a shunt as well can lose proper soc trackong if the battery is not fully charged regularly and how often depends on the type of use
There are mppts with load outputs, you just didn’t buy a model that has one.
Hello thankyou for the quick reply.. as for my amp draw on my 12 volt system.. I guess you could say the whole system is in a state of evolution at the moment swapping over the DC fridges etc… ..few months is no more than about 6amp maybe 10 burst for some appliance at some times total…. . anything hungry on power that I have generally comes off my 3000 Watt pure Sign inverter. . For example. Grinders and saw.. reasonably hungry devices…. Was looking at the 500amp shunt. Is that why I run up to upgrade in unforeseen future . . I never considered the going through a certain balancing routine at a voltage within a defined margin I thought it would start as soon as possible as the deviation can sometimes be great and hard to catch up with.. I appreciate that heads up.. local contact the Battery company and exactly what goes on there… . .. the main things have an away at monitoring the voltage is you’d know we’ve lifepo4. The voltage is and it extremely flat power curve and without monitoring milliamps in and out there’s no way you can guess within a margin of accuracy just by looking at the voltage level unlike flooded cell when you can range from example 10.8 to 14.6. . . The resolution of that scales a lot different I’m sure you understand…
Yes. As i have been using lifepo4 for many years now. I do.
So a shunt whose settings have been tuned right for state of charge is important to have. Or as you say a way of displaying the renogy apl information.