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 > Your search for posts made by 'jharrell' found 5 matches.

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RE: Here we go again yet another Trombetta "Big Boy" failure!

Blue Sea, buy once cry once. Used them on boats in salt water, when I got my RV and had the cheap trombetta go out I replaced with: https://www.bluesea.com/products/category/35/91/Automatic_Charging_Relays/ML-ACRs. Its bistable with hysteresis so no chatter under any condition, silver plated contacts rated at 300 amp live switching, 500 continuous, 700 for 5 minutes and 1450 for 30 second cranking. It detects charging voltage on either side and engages in auto mode (so alternator charges house and shore charges starting) or the switch can be set manual on or manual off. Switch has a light letting you know its engaged. Direct replacement using same wires for combine switch that was already there (had to run extra wire for status light)
jharrell 02/29/20 09:37am Tech Issues
RE: shutting down generator with air conditioner running

They are powered by the inverter. But if you turn off the inverter the fans cease to run. Or, if 120 volt shore power is being used to charge the battery bank via the Magnum, is disconnected, the fans also stop running. The inverter is either running forward inverting making 120v or running in reverse charging using 120v. If it is doing neither than there is no need to actively cool the fets or transformer. The inverter has temp sensors on the fets and transformer, it will run the fans based on temp alone so long as it has at least 9.5v at the battery terminals: From the manual: The inverter contains two internal cooling fans that are automatically controlled. The speed of these fans is determined either by the internal temperature of the inverter or by the load on the inverter. The inverter’s fans will come on under the conditions listed below: • Fans run full speed if the internal transistors (FETS) or the power transformer reaches 176°F (80°C), or the inverter is running at 100% of its rated load. • Fans run medium speed if the internal transistors (FETS) or the power transformer reaches 140°F (60°C), or the inverter is running at 50% of its rated load. • Fans run low speed when the inverter is running at 25% of its rated load. The fans shut down if none of the above conditions are met, or if the battery voltage is < 9.5V. Whenever the inverter is first connected to the battery, the fans start for about one second.
jharrell 08/25/19 03:31pm Tech Issues
RE: shutting down generator with air conditioner running

The cooling fans on my inverter are AC motors. Turn off the inverter, and you turn off the cooling. That is why it caught on fire. Wait a sec. here........... Isn't the inverter supposed to produce AC power ? Why would the cooling fans NOT be powered by the inverter itself ? Am I missing something here ?? You are not missing anything, they are 12v dc fans lookup Magnum Inverter 44-0004 for the replacements, they do not run off 120v ac directly and do not require the inverter section to be on.
jharrell 08/25/19 12:25pm Tech Issues
RE: Voltage drop on inverter

One positive One negative Excellent practice This is why I despise unsoldered lugs Don't give a **** if they're squeezed till they fart, this would never happen with soldered lugs. Oh they look good Tighter than hell But it doesn't work There is ZERO protection between the interior of the lug surface and the stranded wires. I disagree and prefer crimping, these people explain why: https://www.evdrives.com/category_s/4013.htm In the marine world crimping is preferred due to oxidation and soldering can prevent flex at the lug joint as well leading to fatigue.
jharrell 08/10/19 05:08pm Tech Issues
RE: air conditioner without and with autoformer

Make sure Magnum shore setting amps correct, you should have noticed it, but Magnum could be trying to charge batteries and run a/c, lowering shore amps tells the charger to back off, also tells it when load support kicks in on hybrid. Autoform and generator really not a good combo, if gen can't provide voltage auto form pulls more current, dragging gen down even more. Gen should be throttling up to provide correct voltage and current up to its capacity otherwise something wrong with it.
jharrell 08/01/19 09:32am Tech Issues
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