an unusual charging problem

Hi all,

I'm generator charging from need for the first time in my life. It is not hot enough to run the roof air.

Here is a bit about the system.

Magnum 3000 Hybrid 12 volt to 120 volt with ARC remote

Yamaha 3000 sIEB inverter generator

4 139 amp-hour surplus acid telecom 12 volt batteries totaling 556 amp-hours. These are a bit unusual as their specific gravity is 1.3 rather than the more normal 1.275. They have a slightly higher voltage.

256 watts of solar into a Blue Sky 3024 di controller.

voltage monitored with a kill-a-wall unit

Wattage monitored by an Efergy Elite classic watt meter.

Charging rate monitored by the Magnum remote.


Conditions:

Batteries were not fully charged yesterday and were used overnight. Remote display said 12.5 volts.

I started the generator leaving it at maximum output.


I made the following observations:

Remote went immediately to float charging at 10 amps

Load was the fridge at 311 watts (2.5 amps)

Voltage was 122.

I turned off the fridge. No change in charging rate or voltage

I increased the load on the system by turning on the water heater 1300 watts (11 amps) voltage 118

Charging rate increased to 39 amps.

I turned off the water heater and charging amps slowly dropped back down to 10.

The "trigger" point for higher amp charging appears to be about 1300 watts. Doing so may double the fuel consumption rate. I'd prefer to avoid this.