Did another baseline run this morning with electric vs diesel boiler preheating.

I have just about finished my solar install project with seven out of ten solar panels hooked up and it was forecasted to be sunny today (no evidence of it yet LOL!).

So anyway I needed to apply a dump load to drain the house batteries to make room for the solar power input.

It turned out to be a colder morning, forecasted to hit freezing tomorrow.

So anyway I turned on the electric heaters in both of the glycol storage tanks and was drawing about 3.4KW of power from the house battery bank for a bit over an hour.

At that point I turned them off and fired up the diesel boiler, which you can see from the red line that I drew on the chart.



The initial dip in hydronic output temperature is due to diverting glycol back to the diesel boiler at the rear of the bus.

As you can see both curves steepened as the Diesel boiler is a 10KW unit.