Nice to meet you. I have laid out a system but I need clarification on some points. This is my proposed layout................................
Here are the points I need some clarification on. This layout is using two 420AH 12v batteries, smart battery protect, two smart battery sense bluetooth units, a BMV-712 SOC meter, a battery balancer, Mppt control panel and a blue solar 24V 8A mains charger.
1. Am I able to use two bluetooth smart battery sense modules on one solar controller? If so is the software aware that the batteries are in an array and there are two of them. I cannot find anything in the manuals or datasheets that specifies a limit on the 3M or 10M battery sense modules.
2. I have a Bluesmart charger 24V 8A model. If it is part of the bluetooth ve network and always powered (it will not be) will it start charging when a low battery condition detected or will a have to use the relay on the BMV 712. If so and the answer to my first question is no how will I be able to monitor the temperature of the second battery as using the temperature connection on the BMV-712 or battery connect will create problems. My objective is to wire all the alarm or alert contacts in series to a GSM alarm module.
3. There appears to be some ambiguity regarding the four pin VE Bus. If I am correct the ve bus is a proprietary protocol and individual to only some device types. In other words if you have three bluetooth devices paired to a solar charge controller and then use a ve bus cable to link to a pc or colour control gx none of the data from the bluetooth is passed down the physical interface. I would have expected the solar charge controller to behave as a hub and pass on data. I would like to clarify this.
4. In the above setup I have two physical ve bus port equipped devices. The BMV-712 has one as does the solar charge controller. I also have five bluetooth devices. Is it possible to allow the devices to communicate and if so how. If not am I limited to two devices that have the four pin ve bus connection. I have read everything I can find on manuals and white papers about the ve bus and I do not have an answer. I am surprised that by now there is not a common protocol such as RS485 Modbus or keep to a common proprietary protocol such as ve as it would be the most common protocol used, canbus, nmea and others could then be converted with an adaptor.
I would really appreciate some help and advice as to how to arrange communication on this setup. The ideal scenario would be to have two displays. The battery SOC monitor and the MPPT control panel. I have one or two raspberry pi model B+ boards, is there any benefit to setting up the colour gx system on the pi and connecting the components to that. If there is no way to link these devices together all the parts may just as well have 2 clean relay contacts that could be setup as desired. Ideally I would just like the two meters on display. I would rather not have any bluetooth control or monitoring that the customer would have access to.
Any help, advice and ideas would be fantastic and gratefully received. Thank you for taking the time to read this extended post and my apologies if I have confused ve bus and ve direct.