Cariboocoot wrote: »
Welcome to the forum.
You are correct that many an inverter's LVD is set too low. Most inexpensive 12 Volt inverters will go on down to 10.5 Volts, for example.
The best solution is to buy a better inverter that has a programmable LVD. You are going for a 24 Volt system, which opens up the possibilities of using perhaps an Outback 3524. Setting the LVD to nominal system Voltage pretty much precludes drawing batteries too low.
Adding such a safety afterwards is not easy. Yes, you can get programmable Voltage controlled relay drivers: http://www.solar-electric.com/moredr.html The thing is, for controlling an inverter you need a relay capable of handling substantial current. And of course the extra circuitry uses extra power.
BB. wrote: »
Here is another one: