So, several months later, house move complete and it is time to get a shack operational again.
I am a fan of keeping things running when the power goes out. From a Amateur Radio Communications perspective, I have had a 80Ah battery in the shack for over 10 years and I have been using a West Mountain Radio Super PWRgate PG40S and Rigrunner 4010S to power my radio equipment and to keep the battery charged. My current ‘desktop’ is based on a Intel NUC 7i7BNH these along with their LCD’s are running off an older APC Smart UPS 1500, which gives between one and two hours of run-time should the power go out.
While everything was in boxes, I purchased a West Mountain Radio EPIC PWRgate (I wonder what adjective will be used to describe the 4th Generation!) this device can charge Lead Acid, AGM/GEL and LiFePO4 Lithium battery types, and, what attracted me to it is that it has a built in Photovoltaic (PV) Charge Controller. Which removes the need for a dedicated Charge Controller.
Sometime during the move, the old AGM battery died (Ophelia was its final ‘performance’). New shack, new battery, a Trojan EverExceed ST-1280 was ordered from O’Connell Batteries in Cork and duly arrived.
Plug-and-play? well not-exactly. After looking at the specs, the default ‘AGM’ setting in the Epic PWRgate needed some adjusting to avoid overcharging the battery. The battery specifications say 2.35 Volts per cell (for 12 hours), so the ‘Max charge voltage’ needed to be dropped from 14.4 to 14.1 volts, and the PSU set to 14.2. On Linux, the Epic PWRgate appears as /dev/ttyACM0, guessing I used 115200, N81, no handshaking and its console immediately popped up.
Battery: 1-Disable, 2-Gel, 3-AGM, 4-LiFePo4, 5-Other: <3>: 3 Reset to default values (Y,N): (Y,N) <Y>? n Max charge voltage in Volts: <14.10>: Max charge current in Amps: <10.00>: Min charge current in Amps: <1.00>: Trickle current in Amps: <0.25>: Recharge voltage in Volts: <13.49>: Max charge (minutes): <720>: Retry after abort (minutes): <240>: Min supply voltage for charging in Volts: <14.15>:
Once out of setup mode, it spits out readings about once per second. This includes what the state of the chargers is, the power supply voltage (PS), Battery voltage and charging current (Bat), Solar Panel voltage (Sol), Number of minutes in this charging state (Min)
Trickle PS=14.22V Bat=13.61V, 0.05A Sol= 0.04V Min=962 PWM=337 adc=6 Trickle PS=14.22V Bat=13.61V, 0.05A Sol= 0.04V Min=962 PWM=338 adc=6 Trickle PS=14.22V Bat=13.61V, 0.05A Sol= 0.04V Min=962 PWM=339 adc=6 Trickle PS=14.20V Bat=13.62V, 0.05A Sol= 0.08V Min=962 PWM=339 adc=6
Hopefully the battery is as reliable and lasts as long as the last one!