Tator
Guru
- Joined
- Feb 16, 2015
- Messages
- 514
- Location
- United States
- Vessel Name
- Oz
- Vessel Make
- Bluewater 40' RPH 1979
We are just starting the process of replacing our old Onan 7.5 MDJE aka: Mr. Shaky, with a new NL 6kw. We've also been researching replacing our Xantrex Freedom 30 with a Magnum MS 2812. In reading the quite comprehensive owner's manual for the Magnum, I came across a graph showing the effects of ambient temperature on charger output and was surprised by the effects of what I would of assumed were normal environmental numbers on the output. At 79 deg the charger would put out it's full output of 125 amps. At 88 deg it would be reduced to 105 amps and at 97 deg 90 amps. This could seem to explain why in the bulk stage our present charger would start off at 130 amps and continue to fall before reaching the set voltage to switch to the absorption stage. This being with, as I understand it, a continuous current charger.
Our inverter is mounted in an area behind a large cabinet in the MSR. There is a large grill at the bottom of the enclosure that allows air into the area from the cabinet. Unlike the Magnum manual, the Xantrex installation manual is very vague about ventilation. When we go out this week, I'm going to take some temp readings of the ambient air as the charger warms up. I'm thinking about adding a temp controlled muffin fan in the top of the enclosure to improve the airflow.
In searching the Forum, I couldn't find any reference to this particular problem and thought I would throw it out there for discussion and comments.
Tator
Our inverter is mounted in an area behind a large cabinet in the MSR. There is a large grill at the bottom of the enclosure that allows air into the area from the cabinet. Unlike the Magnum manual, the Xantrex installation manual is very vague about ventilation. When we go out this week, I'm going to take some temp readings of the ambient air as the charger warms up. I'm thinking about adding a temp controlled muffin fan in the top of the enclosure to improve the airflow.
In searching the Forum, I couldn't find any reference to this particular problem and thought I would throw it out there for discussion and comments.
Tator