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I think I agree with this. I was not properly realizing that the transformer can create the other leg of output. I was thinking it had a full transfer switch that would disconnect the output from the transformer and send the input straight out. I think your diagram makes more sense. I will...

To answer my own question: Yes, inverters generally have big capacitors on the input (DC) side that should smooth out the current. There should not be any significant amplitude of a 60hz signal on the DC side. My inverter must have some failed parts.

It is a low frequency beast. It has a nice big round transformer. It is a heavy unit. I am going to do that but am hoping to get some "architecture" description help. I mean something that describes what I'll find at the input side and output side and what, if any, these input capacitors will...

I took 2000 samples and pumped them into a discreet Fourier that had a spike at 34 samples, which means 166ms. That is 6hz, which is suspiciously spot on 10x of 60hz (maybe sampling at 4.8ms was too slow to properly pick up the dominant 60hz). Shouldn't the inverter have some capacitance that...

I have an Ampinvt 6000W split phase inverter. For a few weeks of daily use it worked fine. Now, it works fine, but the DC amps are oscillating. If I have a load that should draw around 70A DC, the DC current is swinging from 0 to 150A. I put a digital ammeter shunt inline on the DC side and...

The amps are oscillating when charging and when there's only the clock load. I put a digital shunt in line and it's oscillating very fast. I'll bet it's at 60hz. I'll confirm that frequency. The web page is displaying every 2 sec so it's not capturing the full oscillations

I have an Ampinvt 6000W 24V split phase inverter. The DC Amps are swinging wildly when the inverter is on. Below is a screen shot where the inverter is running an induction cooktop and an oven. The AC amps were 12 and 16 on the 2 different phases, so total 3360W, and therefore 134A at 25V. The...

Their wiring diagram is "high level". It does not provide detail, or to put it bluntly, it is crap. I am in the middle of an enormous back and forth via email with ampinvt. It seems like the email person is translating my words to the electrical engineer and the electrical engineer then answers...

I am describing the typical situation where an RV owner will use a 15 or 30amp connector that delivers the same single 120VAC hot to both HOT of the nema 14-50 plug. So both legs of HOT have the same phase, and therefore have 0V between them. RVs do not have 240VAC loads, so this is totally fine...

I can use a 50A campsite connection, the neutral from the 50A will not be connected to anything. But Ampinvt is saying that the ground should also not be connected. Does this make sense? If either of the hot legs shorted to the chassis it would be rather nasty without a path back to the input to...

Have you thought about getting 3 24VDC mini splits?

I have an ampinvt 6kw split phase inverter in my RV. I don't need 240V. I figured it was the easiest way to power the A/C, stove, oven, disposal, and dishwasher without juggling 2 inverters. I want to retire the 24V power supply that I use to charge the batteries, and the transfer switch. But...

I have plugged in a Victron MPPT 100/50 ($300+) and it produces minimal, if any, additional power compared to the DSSR20, which is effectively a straight connection from the battery to the panels. The MPPT picks 30V as the power point, and of course without the MPPT the voltage is the battery's...

I apologize for using sarcasm in the post that you have replied to. I should have been more blunt as follows. You have failed to comprehend what I am doing and how I am doing it. Unfortunately this makes your comments irrelevant and worse misleading for other readers. Thank you, but frankly...

Not if you design a different type of BMS. Read my earlier comment on what I built. Again, I do not send any current through my BMS. My BMS and Electrodacus and maybe battrium are different. If you read my very early posts in this thread you would discover I want to compare the MPPT with a...

I wrote it above. When attempting to get to 100%, stop charging when any cell gets to xY. Turn charging back on when all cells are below yV. I set mine to be 3.5 and 3.4V respectively. I turn the loads off if any one cell gets below 3.1V. I could be wrong but I don't think that is a deep...

I thought that was the case but failed to find the info. I searched Victron again and found this hairball. "All larger units feature the Victron standard remote on/off terminals. All models that don’t feature anonboard Remote on/off terminal can be remotely controlled by using the VE.Direct non...

Right, because it is impossible to turn charging back on after the cells have recovered to a lower V when the amps are naturally lower from the Sun. See above, where I accept the stated religion. Do any of these MPPT charge controllers do this besides not charging when near freezing and below...

OK, my bad. I will accept the correct belief system. BMS's must have large amp mosfets to be able to shut off the current, because loads and MPPTs should not have simple on/off switches that can be trivially controlled by a very low power relay. Chargers should control the charge because a BMS...

That's the info I was looking for, thanks! I have no problem doing the modbus, ethernet, rs485 route, but I'm not thrilled with that because sending an "OFF!!!!" signal via a complicated communication protocol is lousy. The thermocouple is also doable, but Ugh! I'd be happier with a simple...

Yikes, that's not cheap! Thanks for the feedback.

This is not correct according to trivial googling. For example "current dramatically changes as irradiance varies, but voltage remains relatively constant" Again, there is no need for the SCC to taper the amps. The Sun does this for free every day. Maybe a more complete description would...

Yes, and no. Right now my panels are effectively connected straight to the battery. There's an SSR (effectively a relay) to connect/disconnect them. That's really the only SCC that is needed. The MPPT part is a totally separate functionality from the BMS. It needs to set the voltage the panel...

Sorry, I just realized how to make the point more succinctly. The Sun does not provide Constant Current charging or Constant Voltage charging on Earth.

You are correct. I think you are right about the MPPTs. I am looking at DIY MPPTs.

This is the situation everyone has learned because all the equipment is descended from lead acid. With lead acid you monitor the pack voltage and you need to run the battery up to 100%, and keep it there as much as possible, which is determined by the voltage. With lithium multi cell packs, it...

The flaw with this thinking is that all of this is more complex. My loads (DC/DC and inverter) and chargers each have a simple on/off switch. If the circuit is open the device is off. If it is closed, it is on. None are relying on microprocessors and measurements to decide on/off. I can easily...

An MPPT is not always more efficient. You'll notice they generally have heat sinks, that means they throw away energy. The SSR's I have produce almost no heat. One needs to prove that the MPPT will be worth the $ and it depends upon the use case, batteries, temperature, and the panels. If you...

As stated in the title, I am looking for an MPPT. I am already using a simple relay to connect/disconnect the panels (Electrodacus DSSR20). I am interested in both comparing with the MPPT to see if it gains anything and also running 2 panels in series which would double the voltage and thus move...

My LiFePo4 battery monitor will close a relay to turn on/off the charging. I am wondering if there is a simple MPPT that has no user interface at all. It just needs to keep the voltage of the panels separate from the battery and attempt as high as possible voltage on the battery. I suspect...

I am buying 16 30 cell flexible sunpower panels from China. My thinking is that 2 will fit under the 330watt fixed panels and I can support those fixed ones with 3 slides to reduce the flexing of them

Yes, the DSSR20 is a substitute for a controller. It is effectively a relay and a diode, and that means it is much cheaper, and simpler. That diode solves your #3 concern. What regulation are you talking about in #1? What coordination? I don't see the point of #2. It makes no sense to me to...

That's what I use. I don't use the diversion, but I do have my BMS turn on the water heater when the batteries are above 90%, so I have the poor man's version of that. Oh, that's a bit unfair. I find that most people have not really questioned the MPPT. I had an exchange on another forum where...

How much weight did you add to the roof? Can you feel it? I am very tempted to throw 500lb on my roof then do some tests. Basically I would want to measure the amount of rocking when driving one rear wheel on a hump at an interesting speed.

I don't see why the flexi panels are any different. They use the sunpower mono crystalline cells that are pretty much the same in terms of watts/area. I agree that adding 500lb down near the chassis is irrelevant in my class A, but 500lb on the roof is significant. That's a lot of moment of...