Starting in late August / Early September, my Delta Pro began to discharge very quickly. Loads that it normally would power all night before were only lasting a few hours. I also didn’t correlate until later, but the Delta Pro was also “charging” very quickly. The same solar panel input was making the charge percentage climb quickly.
I checked all my house loads and all seemed normal. In trying to research what was going on I ran across a list: What do the error codes on Delta Pro mean?
I noticed that many solutions just needed a reboot, or a slow charge, but the last one caught my eye: “077: Cell Voltage Differences are too great - Long press the power button for 10 seconds and wait for half an hour.” Even though I didn’t have any error codes, I thought I would try this. Sunday, I turned off all loads and inputs to the Delta Pro and experimented with the 10 second hold on the power button. It was difficult to know if I was doing it properly, so I tried several times with the unit off and on before pressing the button. I noticed immediately a change in the charge percentage. If I remember right, it was 33% before the button press, but after it came back as 82% and quickly changed to 75% and stayed there. I let the unit sit without doing anything for a couple of hours and then turned back on a small load. The next morning solar began to charge the unit. I did turn on some heavy loads for 30 minutes or so this day. Monday night, I deliberately ran the unit down to shutoff. It was interesting as it didn’t really know how much power it had left. I got tired of waiting, so I put on a 1700 watt load where it said it had 1 minute left and it ran for another 15 minutes. Afterwards I put the unit on a slow 200 watt charge until solar kicked in and being a cloudy day it wasn’t much more than that throughout the day. At night I turned the unit back on to a 200 watt charge until it reached 100% as it only charged to 77% throughout the day with its fridge load. Today it seems to be performing even better than before.
It seems as though the Delta Pro began to only use part of its battery capacity. So my questions are:
I checked all my house loads and all seemed normal. In trying to research what was going on I ran across a list: What do the error codes on Delta Pro mean?
I noticed that many solutions just needed a reboot, or a slow charge, but the last one caught my eye: “077: Cell Voltage Differences are too great - Long press the power button for 10 seconds and wait for half an hour.” Even though I didn’t have any error codes, I thought I would try this. Sunday, I turned off all loads and inputs to the Delta Pro and experimented with the 10 second hold on the power button. It was difficult to know if I was doing it properly, so I tried several times with the unit off and on before pressing the button. I noticed immediately a change in the charge percentage. If I remember right, it was 33% before the button press, but after it came back as 82% and quickly changed to 75% and stayed there. I let the unit sit without doing anything for a couple of hours and then turned back on a small load. The next morning solar began to charge the unit. I did turn on some heavy loads for 30 minutes or so this day. Monday night, I deliberately ran the unit down to shutoff. It was interesting as it didn’t really know how much power it had left. I got tired of waiting, so I put on a 1700 watt load where it said it had 1 minute left and it ran for another 15 minutes. Afterwards I put the unit on a slow 200 watt charge until solar kicked in and being a cloudy day it wasn’t much more than that throughout the day. At night I turned the unit back on to a 200 watt charge until it reached 100% as it only charged to 77% throughout the day with its fridge load. Today it seems to be performing even better than before.
It seems as though the Delta Pro began to only use part of its battery capacity. So my questions are:
- What happened and how to avoid the rundown in the future?
- What did the ten second hold actually do? How are you supposed to do the ten second hold? With the unit off or on?
