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Colt, I fixed it by disconnecting my PV array. EG4 was then able to turn on without a short circuit alarm and then the MPP LV6048 was able to power up. I was the able to reconnect my PV array.

This has not been my experience with SS. I had an issue recently with an EG4 Lifepower4 going into short circuit alarm when being turned on. To start I was unable to reach anyone in support via phone and finally after many pointless emails was told just to buy another battery. I did eventually...

McRod, I placed one end of the resistor on the EG4 + terminal and connected the other end of the resistor to the + battery wire. That allowed me to turn on the EG4 without a short circuit alarm being tripped, which then allowed the LV6048 to power up. Of course this was not a real solution to...

Z, I am completely off grid. I’m pretty sure the circuit board gets power from the battery.

Ok after disconnecting my PV array from the MPP LV6048 I was able to turn on the Lifepower4 without it going into alarm mode and then turn on the LV6048. Everything is running fine after then reconnecting the PV array. SS support was useless and they said exactly what Robby said they would...

So sten I had the exact same battery behavior happen to me last night. I have a Lifepower4 and MPP LV6048 that has been running fine since early Apr. 2022. I noticed last night that I couldn’t contact my Raspberry Pi Running SolarAssistant to check on the system. Went down stairs and saw...

I have 2 of these for my camper : https://www.amazon.com/SUNPOWER-Portable-Monocrystalline-Lightweight-Connectors/dp/B0779PCVW4/ref=sr_1_3?crid=18LIKKID50PHN&keywords=sunpower+100+watt+flexible+solar+panel&qid=1655065291&sprefix=Sunpower+%2Caps%2C277&sr=8-3 A little pricey but very high...

Renogy and Victron sell DCDC chargers with about 20 A draw, not the 10A you are looking for but I think doable with a 7 pin RV trailer plug.

Sounds like a smart approach!

So you might be able to avoid the expense of a new alternator by using an inexpensive thermocouple thermometer like this and monitoring alternator temps. Seems like temps over 225F could be a problem (see this )

I’m not an expert on alternators but I think your experience with generators is applicable here. Running close to 100% of capacity for long periods will impact lifetime usually because of excess heating. This suggests not using more than 2/3 of your alternator capacity. So a DCDC charger load of...

Should be fine connecting DC-DC charger and MPPT together to battery busbar (see this and Victron system diagram above) even if they have diff charge profiles. Make sure your battery can handle combined current of MPPT and DCDC charger. Currrents are additive so if you are charging at 80 A and...

So on reading the Sterling charger spec sheet more closely I see this : 6) Night Time Setting: Allows the unit to ran at half the power so the fan noise is kept down. So supplying 35A might be doable for your alternator without too much stress

MPPT controllers usually require input voltage to be at least 5 volts greater than output voltage

Yeah so the spec sheet on the Sterling charger says that at 12V in and 48V out the “Amps in” is 70A. So assuming 90% efficiency the current output at 48V would be .9 * 12/48 * 70A = 15.75 A

So the Sterling DC-DC charger could suck up to 70 A from your 120 A alternator which I think could stress your alternator if done for long periods of time with other high vehicle loads. I’ve attached a Victron doc which shows a system similar to yours, except with Victron products of course...

So each of the 3 banks of 18s cells could supply 100 A for 2.71 hours or 300 A for 2.71 hours or 813 AH for all 3 banks in parallel.

No the output is not a 150 kHz square wave but a DC level up to 120 volts. The 150 kHz is the frequency used to drive the switch in the boost circuit shown here

If your panels have bypass diodes (most do ?) wouldn’t it be a little better than this ? I think with bypass diodes a partially shaded panel could still source 10 A but at maybe 20 volts instead of 30 V. So power would be : 2 x 10A x 30V + 1 x 10A x 20V = 600W + 200W = 800 Watts This is based...

Nice drawing. What tool did you use to create it ?

I use this 12V 2000W Renogy inverter with my ElectroDacus SBMS0 and am able to have the SBMS0 turn off the inverter when battery drops below a programmable SOC. I can’t vouch for the quality of this inverter as I haven’t used it much but when testing it has no problem with my 1500W heat gun...

If you really want to understand the fundamentals of electricity, Feynman can explain it better than anyone : https://www.feynmanlectures.caltech.edu/II_toc.html Heavy on theory but Feynman makes it digestible.

As I am a simple minded person, I can offer a simple analogy : Electrons are moving to a state of lower potential energy much like a ball rolling down a hill.

Yes kinda like the earth sucking you in :)

Yes you are exactly correct. The positive terminal is attracting or sucking up negatively charged electrons.

Conventional current flow is positive charge flowing from the positive terminal (cathode). For metals this is equivalent to electrons (negative charges) flowing into the positive terminal. A good overview is here

I just took off the back cover of the remote and found out that the middle two wires of the RJ-11 connector (red and green wires) are tied to the on/off switch.

The Titan solar generator (https://www.pointzeroenergy.com/titan-solar-generator/) is able to do 1500 watts but is not cheap ($3000). Will did a video on this unit. Is 1000Ah for real? That's at least 12 KWh.

I think you hit the nail on the head. From the URL above : 40amp DC-DC Converter for 12v appliances. 24v goes in, 12v goes out

Was your DC-DC charger designed to be able to charge LiFePO4 batteries ?

How do you run AC appliances from a battery without an inverter?

I don't think the OP even remotely implied this. I think the message was "caveat emptor" on cheap Chinese made DC-DC converters

I think your approach makes a lot of sense. After reading Dacian’s (electrodacus.com) analysis of MPPT SCCs I wonder about reliability of DC/DC converters. Maybe best to avoid the issue by using existing 12 volt house system. Also bonus not needing to rewire anything ! Anyone have thoughts on...

Hello All, I've been lurking on this forum for a while and learning a lot. Thanks everyone ! So I'd like to put together a solar generator system for my 5th wheel RV. I want it to be modular and expandable so I can start small and cheap and eventually expand to be able to power the entire RV...

The "System Schematic For Large Inverters" section on https://www.mobile-solarpower.com/design-your-own-12v-lifepo4-system.html does not show cell voltage sense connections from the BMS to the battery. Is this intentional or an oversight ?