Hi, I installed Venus 3.50-18 today and got my first glimpse of GUI-v2 and like to give some feedback:
The battery doesn’t show the Watts but prominently the percentage and an Amps value which isn’t directly comparable to the other parts (DC-Power, PV Charger). I need to see the Watts to know if the state is optimal or if I eg can add some load to use more of the available sunlight or otherwise reduce the load to save battery life.
Some text has a gray foreground which may be appealing for the designer but is an obstacle for readability, esp. if you need glasses to read. If you want to keep this default, please provide something like a high contrast theme where every text is white or even black on a white background.
Hi @Off_Grid Welcome.
Please familiarise yourself with the “how to post” topic in beta, as well as the changelog request to not update the log. This makes it easier to deal with issues.
Kindly first check the changelog and existing posts, as these issues may already be known.
I have moved this to a new topic, please update the title as needed, also indicating the version. Thanks
But I think this is not what he wants to do. This only changes the unis at overview page. I think he wants to have Watt for battery at brief page.
In my opinion he os absolutly right with this because brief view for me is something which even lay people should understand. And everyone knows W but only experts understand V and A in context to a battery.
Hi, yes, that’s the point. I started the GUI-v2 from the VRM-app menu and didn’t see anything but the brief page, esp. no way to change any settings.
WRT lay people I think they may feel more familiar with Amps with batteries but it’s a false friend. Many don’t even know there’s a difference between A and Ah and even professionals tend to forget the current in Amps does not properly reflect the power drawn from or going into the battery, you need the voltage too. If you put 1 A at 12.0 V into the battery it’s 12 W but 1 A @ 13.2 V is 10% more, 13.2 W. Thus showing the power, in Watts, should be preferred INHO.
I think people have different meaning about. I would still prefere to see voltage and amps as this will be the most important values for batteries. But I also understand your points. If I compare brief with overview, so why not to show both: 1rst line like now with voltage and ampere and a new 2nd line with power in W. Same like in overview section but only devided in 2 rows. In my eyes there is quite enough space for it.
I think there is a difference depending on the application.
Users of campers are familiar with amps because the capacity is given in Ah and charger power and solar is displayed in A mostly.
But at house systems like ESS everything is displayed in W, kW and Capacity in kWh.
Exactly this. It would be wonderful if it could be configured. The nice thing about watts, is that a 1600 watt hair dryer used 1600 watts of AC, and if inverting from DC, it uses 1600 watts of DC.
Sorry but the most important value with batteries is Watts, just as with solar panels and everything else, because that is the power going into or out of the device. I even would prefer the power shown as the primary value instead of the percentage, just like anywhere else, because when the percentage has dropped significantly it generally is too late to react. On the contrary, when the power drawn is much larger than the input from the panels you can see instantly your battery will be emptied rather soon and reduce load or take ither action.
Ampere is not a unit of power but of electric current. It is related to the power just like the speed of your car is related to the power your engine excerts. To get the power you have to multiply the Amps with the voltage and the speed with the force your wheels put on the ground, respectively. And the power ultimately determines how long it takes to charge or empty your battery, Amps is just a approximation and using it to state the battery power is nothing but a bad habit At times you have to cut off old braids as the German says. Modern lead acid batteries already state the capacity in Wh too, not only in Ah.
Amps are definitely a useful piece of info to have, especially for those running mostly off of a battery. First off, the math for “I have 600Ah available and right now I’m burning at 100A, so I have about 6 hours left” is way easier than “I have 8280Wh available and right now I’m burning at 1380W so let me pull out a calculator to figure out how long I have left”. Also, you’re unlikely to find a BMS manufacturer that rates their max and preferred input and output rates in anything other than amps.
@Off_Grid : I didn´t get your point. Also wth capacity in kWh: if the capacity significantly has dropped (doesn´t matter if percantage or kWh), its too late to react. I can understand if you want charge and discharge power in W instead of current (A) and voltages (V). But SoC in percentages is a common and accepted value everywhere.
I never objected to showing Amps as a secondary figure or having it configurable but tge primary choice should be sound and Amps isn’t.
1.4 kW times 6 is 8.4 kW. You need a calculator for that? And what if your battery states 95 Ah and the current drawn is 37.6 A? Do you need a calculator?
The calculation in Watts is more accurate than your guesswork in Amps because, as I already stated, 1 A @ 12 V is different from 1 A @ 13 V. If you put 1 A into your battery at 13.8 V and take out 1 A at 12.9 V you have put in more energy you have taken out.
I didn’t say I wished to have the capacity (kWh) as the prinary value but the power (W) going in or out. That value shows how much the battery charge changes, the percentage shows the current state and I can directly compare Watts in or out of the battery with Watts from the panels, generators, loads etc. Thus I see it as the most important figure and even would like to have it configurable as the primary value. But that’s different with Amps vs Watts because showing Watts is accurate while Amps is nothing more than an approximation of the power and it’s battery only. You can’t compare it to the other parts of your system. You may of course show it additionally for those who want it.
