limycenter
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Posts posted by limycenter
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Tom (and myrontruex and Dwight)
Thanks for the replies. I have had these batteries for 2 years. When I first installed them I contacted Magnum, bought an updated monitor unit and setup a CC/CV charging scheme that was compatible with the Valence spec sheet AND the magnum charger/monitor combo. I am able to monitor the batteries via a custom cable and computer. They are healthy and working.
I live in this rig full-time and am almost always plugged into shore power. I leave the charger in Float at 13.6 (which is find for the batteries according to the spec sheet).I jumped the house to the chassis batteries and the charger DID not see the low battery voltage and start charging ....... i did not turn off AC to test inversion method.
while driving about 2 days ago, the front switch did get the inverter working (i am assuming off the truck batteries).I will find the fuse to see if that is the cause since when i hardwire a battery to the inverter......it will charge the battery.
Clint
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These are Valence U27-12XP. They do not have built-in BMS.
11 hours ago, Dwight Lindsey said:What lithium batteries do you have? I recently installed 3 SOK 206 Amp Hour batteries. Today, while on battery, I ran the microwave and the Keurig coffee maker. Lost all 12v and inverter. The SOK batteries were dead. I had caused a high amp disconnect and the BMS in one or more of the batteries shut down.
The way to fix this is to briefly add a charging source to the lithium batteries, which will wake up the BMS and clear the fault condition. I did this using jumper cables from the chassis battery.
When you use the "batt boost switch" from the drivers position, you are briefly putting a charge voltage on the lithium batteries.
When this happens again, I suggest checking the voltage at the lithium house batteries when the 12v and 120v inverter circuits are not working. Then, when you use the batt boost switch and get things working again, check the voltage again.
Of course I don't know what's going on in your system. You may or may not have a fault condition that is shutting down the BMS in your lithium batteries, but you may want to check.
Dwight
The plot is thickening.......
I have 1 house battery plugged in. But the disconnect switch is in the OFF position. Last night, I was wakened from my slumber for a low battery warning by the Aladdin system (12V on the Lithium).
I went out and disconnected the house battery. But now my door keypad and keys do not lock the coach. The inverter is still putting out DC to the coach.
I have installed a Battery Isolation Manager in place of the fatboy relay to keep the batteries charged.......
https://battlebornbatteries.com/product/lifepo4-battery-isolation-manager/
36 minutes ago, myrontruex said:It appears DC power is not getting to the inverter from the lithiums. How the engine batteries get to the inverter with the boost on is a bit of a mystery but who knows how your system has been modified?
In any case, I would disconnect the shoreline. Remove the negative lead/s from the engine batteries so they are isolated and will not give you a false reading.
Work your way with a voltmeter from the Lithiums to the inverter. You may find a large amperage fuse mounted someplace that is hard to see. In any case, it should not be difficult to chase those heavy-duty wires.
If you need/want to get a measurement on a wire somewhere midsection, for example, sharpen your positive probe using a bench grinder so it has a very sharp needle point. Tape up all but the last 1/4 inch of the probe. Now you can pierce the heavy insulation on the wires and they will self-heal basically when you take the probe out. A good ground is an absolute must when metering of course.
With two battery paths in your setup, it would be very easy for a digital voltmeter to fool even the most experienced tech.
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Hey Everyone
My Problem:
House does not have working 120V or 12V when plugged in or on generator until I short the batteries together with ignition on at the dash switch. When i hit the switch with the ignition on, the inverter will kick on/pass 120V to house along with DC to the 12V system
So my thinking is the fuse connecting the inverter to the house batteries is bad......but that might be another squirrel that I am chasing. I can't find the big fuse that connects the house batteries to the inverter.
- went to leave camp and coach wouldn't start (was plugged in, charger was in float mode)
- finally got started and inverter was reading .5V on house batteries so wouldn't invert
- batteries read 13.4V at the battery (I installed lithium 2 years ago)
- in rear fuse/relay box, the house batteries are not making it to the box
- Arrive at new destination and plug 50A into shore power but don't have 120V on the other side of the inverter side (inverter/charger won't pass the 120V) and charger won't supply DC
- i am able to "kick-start" the inverter by shorting the chassis to house batteries using switch up front when the ignition is ON.....EVERYTHING WORKS, 12V and 120V gets passed through the inverter. All is good until i lose 120V power then i have to kick-start the system. The house batteries are NOT getting charged
- I assumed that the battery disconnect switches were bad and replaced them after lots of screwing around ..... they are in a painful to replace area and hard to acquire since they are 4 post and wired in a unique way
- Stock inverter (was replaced 3 years ago right before I bought) but its still the stock model 3K Magna (NOT HYBRID)
- House batteries are good, inverter IS working ---- I unhooked the inverter from the coach and direct connected a battery and it worked (started charging the batteries)
2006 Monaco Executive Ranier IIIF (3 slide, 2 front and 1 rear). Having issue with chassis batteries and DC output of Inverter (can't find fuse)
in Electrical Systems
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You did not offend me at all. Your concerns are valid, i was happy to answer your good questions with the right answers. As much as some try to make us believe that lithium are drop in replacements.....they arent!!!!
Anyway, your gut feeling was spot on and after 1 week of pulling out my hair.......I FOUND THE ISSUE and its a doozie.
The lug going into the rear box from the house battery was loose and the cable was NOT connected into the back box. ugh......argh......sigh.....yay!!!!