![]() I wonder if this is a well known scenario …. This makes me wonder if there is a fault with the split charge relay, I don’t fully understand how they work and if they are designed to allow current to pass both ways, if so it seems like a design flaw as with the panel connected the vehicle battery will never drop below the threshold. ![]() To test the theory I turned on the ignition and switches the vehicle lights on until the excess voltage was used and the relay closed the circuit, at which point the shunt and mppt readings match. What seems to be happening is that when the vehicle battery is >16.5v and the split charge relay opens the circuit and the panel is connected the panel is charging the leisure battery and the vehicle battery. The relay opens the circuit if the vehicle battery voltage is >16.5v. ![]() ![]() The vehicle has a voltage sensing split charge relay installed. Your comment did give me an idea though which has led me to understand the cause of the issue which has now led me to a new issue. There is no load reading on the shunt with the panel disconnected. Changing these settings has no impact on the detected current. The settings on both devices are basically factory defaults, I changed the charged voltage on the smart shunt to 13.6 volts and the tail current to 1.5 with an 8 minute detection as the shunt kept setting the SOC to 100% despite the MPPT being in the absorption stage. I have tried changing cables and using a different battery / solar panel but consistently see the numbers are around 30% different between the two. I don't have a clamp meter to check the actual current on the MPPT output cable and I thought before I go an buy one I would post on here. There is no current being drawn from the battery - verified by disconnecting the panel and checking the data on the Shunt. It is difficult to get an exact snapshot due to having to switch between the devices within the app but the output from the MPPT has been consistently the same for around 15 minutes as has the reading on the SmartShunt. I have included a couple of screenshots taken within the same minute using the IOS app showing the difference in data between the two devices. The positive output from the MPPT is connected to the positive post on the battery.Īll of the equipment and battery are stored within the same space and are connected using small cables of the correct rating for the maximum current. The setup I have is a small portable 100w panel from Renogy which is connected to the MPPT the negative output from the MPPT is connected to the load terminal on the SmartShunt, the terminal labelled battery on the SmartShunt is connected to the negative post on the Battery (105 Ah). The reason for the upgrades was to enable me to manage the power usage of my leisure battery while I am away, I love the products I think they are great. Hi, I am relatively new to the use of Victron products and recently upgraded my solar charge controller to a Victron MPPT 75/15 and installed a SmartShunt in my campervan. Now you can use your phone to monitor multiple devices at the same time. 20ft Shielded cable allows you to monitor the battery status from distance.TLDR:Current Output current data from MPPT controller is around 30% higher than SmartShunt current data The Renogy Communication Hub allows you to connect multiple Renogy appliances with an RJ45 port and RS485 communication protocol to just one BT-2 Bluetooth module.Transparent shunt holder makes it easier to mount the shunt.Compatible with various types of battery: Lead Acid(AGM), Lithium Iron Phosphate, Lithium-ion, Nickel-metal hybrid.Universal Battery Monitor- Voltage range 10V-120V and up to 500A.Displays multiple electronic parameters (Voltage, Current, Consumed Power and Battery Capacity). This unit is able to monitor the amperage flowing out of the battery bank and will give an accurate state of charge reading on the LCD screen.Data Storage – Designed to automatically store the last testing data when system shuts off.High and Low Voltage Programmable Alarm – Backlight and voltage value will flash simultaneously.Improve the overall performance and longevity of your battery bank today! This unit is able to monitor the amperage flowing out of the battery bank and will give an accurate state of charge reading on the LCD screen. The Renogy Battery Monitor is an excellent addition to any solar system and will eliminate the guesswork from battery usage.
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