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Thread: Inverter Diagrams
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07-26-2019, 03:14 PM #11
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Traveldawg---thank you, after going back and looking at the diagram of your sub-panel it makes more sense.
You show 30A from Inverter and (4) 15A breakers; correct?
Whats the purpose of the 300 amp fuse and cutoff switch?Brian-USMC Retired
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07-26-2019, 03:32 PM #12
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Safety during equipment malfunctions. Isolation while doing maintenance.
3.5.4 fuse Protection in the battery circuit - Samlex Inverter:
A battery is an unlimited source of current. Under short circuit conditions, a battery can supply thousands of Amperes of current. If there is a short circuit along the length of the cables that connects the battery to the inverter, thousands of Amperes of current can flow from the battery to the point of shorting and that section of the cable will become red-hot, the insulation will melt and the cable will ultimately break. This interruption of very high current will generate a hazardous, high temperature, high-energy arc with accompanying high-pressure wave that may cause fire, damage nearby objects and cause injury. To prevent occurrence of hazardous conditions under short circuit conditions, the fuse used in the battery circuit should limit the current (should be "current Limiting type"), blow in a very short time (should be fast blow type) and at the same time, quench the arc in a safe manner. for this purpose, uL class t fuse or equivalent should be used (As per uL Standard 248-15). This special purpose current limiting, very fast acting fuse will blow in less than 8 ms under short circuit conditions.
Appropriate capacity of the above class t fuse or equivalent should be installed within 7” of the battery Plus (+) terminal (Please see table 3.1 for fuse sizing).
Marine rated battery fuses, Mrbf-xxx Series made by Cooper bussmann may also be used.
These fuses comply with ISO 8820-6 for road vehicles.- Gene
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07-26-2019, 04:22 PM #13
The Lynx stuff is just fancy bus bars essentially. Each of those boxes has 2x 1000A bus bars with 4 positions each. The Power-In on the battery side is "dumb" bus bars, the Lynx Distribution on the other side is for loads, it is the exact same bus bars with positions for MEGA fuses for the connected loads and will show an LED indicator if a fuse is blown. I liked it for the heavy duty design, modular capability (they are made to be chained together), and single brand design continuity once it is all installed. You could connect the RV DC In anywhere you want as long as it is AFTER the cutoff switch and main fuse. I tend to spend more than I need to for things to look pretty and be easy to service/troubleshoot down the road - the Lynx stuff offers no real-world benefits vs a simpler bus bar design. They are decently priced though, the Power-In is like $130 for 2x 1000A bus bars which is actually pretty good.
A finished install with them can look something like these. There is a blue plastic cover that goes on top of it all once you are done making connections.
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07-27-2019, 10:05 PM #14
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Brian,
the 300a fuse is to protect both the batteries and inverter from one another behaving badly (inverter drawing too much current or inverter not charging the batteries correctly).
The cutoff switch going to the Converter/Inverter is to shut the inverter down if/when necessary (like if I want to go into my sub panel). The other cutoff switch (lower right) is the original set off switch that GD installed. I left that converter and switch in the RV (it was the original GD converter) in case my primary Inverter/Converter fails.Larry KE4DMG
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10-23-2019, 07:33 PM #15
Re-pack bearings necessary?
Today, 09:25 AM in Axles, Brakes, and Suspension