Jon R
Senior Member
Hi All,
I finally plugged my new Grandby (delivered May 2021) into shore power for the first time yesterday so I could use the 120VAC outlet inside. The 120VAC outlet in the front of the sink cabinet doesn't work with all circuit breakers turned on, but I know how to troubleshoot that. The really odd thing that happened was that the DC voltage as registered by my BMV-712 slowly rose higher than I expected.
My Lithium battery was fully charged when I turned on shore power, and initially the battery voltage shown on the BMV-712 was about 14.2 volts (I have the charging voltage limit set to 14.4 on both the Victron MPPT charger and Orion). I noticed the displayed battery voltage was slowly increasing, so I watched it. Over the course of the next minute or so it kept increasing, and I finally shut off the circuit breaker supplying the Iota as it went above 14.8 volts. I did not check the voltage with anything other than the BMV-712.
From looking at the specs of the Iota, which say its no-load voltage is 13.6 volts, I would not have thought it would exceed 13.6. It was as if the Iota was ramping the voltage up to achieve a target bulk charging current. I don't know how it decides whether to behave as a power supply or a charger. It only has one set of 12VDC output terminals.
When I pushed in the kill switch, disconnecting the battery, and then turned the Iota back on, the voltage display on the 12VDC/USB outlet device read the expected 13.4 volts for when it is functioning as a power supply.
Any ideas about what's going on? I may not understand how the Iota is intended to work.
Thanks
I finally plugged my new Grandby (delivered May 2021) into shore power for the first time yesterday so I could use the 120VAC outlet inside. The 120VAC outlet in the front of the sink cabinet doesn't work with all circuit breakers turned on, but I know how to troubleshoot that. The really odd thing that happened was that the DC voltage as registered by my BMV-712 slowly rose higher than I expected.
My Lithium battery was fully charged when I turned on shore power, and initially the battery voltage shown on the BMV-712 was about 14.2 volts (I have the charging voltage limit set to 14.4 on both the Victron MPPT charger and Orion). I noticed the displayed battery voltage was slowly increasing, so I watched it. Over the course of the next minute or so it kept increasing, and I finally shut off the circuit breaker supplying the Iota as it went above 14.8 volts. I did not check the voltage with anything other than the BMV-712.
From looking at the specs of the Iota, which say its no-load voltage is 13.6 volts, I would not have thought it would exceed 13.6. It was as if the Iota was ramping the voltage up to achieve a target bulk charging current. I don't know how it decides whether to behave as a power supply or a charger. It only has one set of 12VDC output terminals.
When I pushed in the kill switch, disconnecting the battery, and then turned the Iota back on, the voltage display on the 12VDC/USB outlet device read the expected 13.4 volts for when it is functioning as a power supply.
Any ideas about what's going on? I may not understand how the Iota is intended to work.
Thanks