Not a TriMetric, but for $20 might be worth trying out...

Mr wizard is right. I want to know how to program the battery monitor discussed above that originated in China. i want it to give me an idea of how my consumption of amp hours is being replaced by hard charging in the morning using an Onan 5500 for a couple hours and then topping off with 200 watts of portable solar. The percentage of charge would be most helpful in learning how long the Onan needs to run. The solar controller already tells me how many amp hours I am collecting during the day, but have no idea how many amp hours are being stored by the Onan. I have estimated that the coach is using 100-125 amp hours during the day and by morning the two group 31's are down to 11.9-12.2 volts. I don't like depleting the batteries that low and would like to get the state of charge to as close to 100 percent as possible, to do that i need to have a better idea how many hours the Onan needs to power the Progressive 9260 charger.