RenogyBattery Shunt 300 with the Built-in Bluetooth, Measure Battery Voltage and Current, Compatible with Lead Acid, LFP, Li-ion and Ni-MH

Great addition to my solar set up in the van/camping. Easy to see at glance the expected wattage/voltage of batteries. Easy set up and good value. Only issue is trying to register on Renogy. The reviews on their app are indicative of the apps value!

Great product does exactly what it says

Very easy to install. Great product.Best feature, is how long until the battery is charged. Very useful

Great product poor instructions

I bought this as an upgrade to a very very cheap one which worked but not that well. This one is quite a reasonable price too compared to other solar specific ones which are more than twice the price. The main improvement with this monitor is that it's much simpler and clearer to read the screen than the last one and seems to keep a reasonably accurate readout of the current battery state of charge in both Ah and % used (I cross checked it against another old AC plug in device I had). Note that I have my monitor in both the charge and discharge loop so it gracefully counts up and down in both modes. The extra long cable between shunt and monitor is a nice touch if you want the monitor remote from the battery bank. There is some small room for improvement in the manual/setup instructions:In the manual it suggests setting the max voltage to about 12.6v, this doesn't work, you need to set it to around 14-14.4 volts, the charging voltage. If you don't do that it refuses to count down from max capacity. I set the min at about 11.6v but my inverter automatically cuts out if the batteries get too low anyway. This may need further adjustment on the monitor if I ever run it low.It's not clear whether you should set the Ah to the battery bank nominal or to the max useable. It's ultimately your choice. I set it to battery bank nominal because my inverter has an emergency 20% cut-off and the battery bank only cycles 2-3 times/year so deep discharges are not going to significantly reduce the lifetime.On my installation the batteries are kept on trickle charge all the time. This trickles a few watts into the battery bank every half hour and kept waking the display up to bright mode, which was annoying. If you read the manual very carefully this can be switched to dark (but not blank) screen all the time. It was a bit tricky to find but obvious when I found it.You may need to cycle the battery bank a couple of times to get a true 'full' value when you set the Ah on this monitor. The first time I set it, discharged to 50% then re-charged it recharged for about another hour past 100% before stopping. Not exactly surprising given the variability of my lead acids.Because this goes up to 500A you'll need smaller bolts for smaller current wire ends on 40-100A setups, luckily I had some to hand. Also I found that for mounting it a 2x 240v AC Blank plate (with square hole cut in) and 30mm deep back box worked well.Pretty good though, would recommend.

Put in Motorhome, great for monitoring use now I’ve upgraded to lithium batteries

Bit pricey but does the jobRunning 6 life-o 100 amp batteries

As good as the top brand ones at half the price. Very easy to fit and set up. Fitted to a Renault Master campervan.