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mrusmc53 asked

MPPT Bulk LED failure states insufficient power to start charging. What is solution?

I started with 4 Battle Born 240 AH and a Victron Multiplus II 12V /3000. added 6 - 220Watt solar panels through a combiner box, then a MPPT 150/85 Solar charger. Use a shunt BVM 712 to monitor. I've ordered a Cerbo GX, it will be a week before it gets here. I get a slow blink on the
Bulk LED stating system is powered but there is insufficient power to start the charging. The 5V spread to turn the charger on is working, there is plenty of solar harvest, averaging over 300 Watts all day long. What does insufficient power mean? How do I correct for insufficient power? The second question is the inverter overheats. The positive cable servicing the output of the inverter to the bus bar gets very hot if I am just living off battery, running 1 AC unit, Starlink, laptop, led light, and misc minor electronics. The function of battery only works well, just overheats, I put a coolling fan on the iverter box, but that's not enough,

battery chargingMPPT SmartSolarsolar
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Alexandra avatar image Alexandra ♦ commented ·

Where are you getting the insufficient power message from?

How are the panels combined? 3s 2p or 2s 3p?

If things are getting hot they are either loose, badly crimped or undersized.

3k @12v is 250+ amps so 95mm² cable at least should be there.

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mrusmc53 avatar image mrusmc53 Alexandra ♦ commented ·

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mrusmc53 answered · 4 secs ago

The solar panel are individually wired to a 6 position combiner box. Originally I wired them 3s 2p and thought that was my problem, but that change made no difference. On the solar charger, the Bulk LED flashes once every 3 seconds, the manual on page 11, section 3.10 LED indication. and on hot wire, They are 000. were the ones that were installed originally. the hot set is only from the inverter to the switch, switch to fuse, fuse to buse bar. after the buse bar all cables are just warm as they should be. My batteries will support my RV for over 8 hours. The installation of the solar has made no difference, telling me I'm not charging, and I cannot figure out what is causing that. I will recheck my cable crimping, sizing, and connections......again!!! ugh Thank you for your help,

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