Was it really 5 years? Tempus fugit :)

haha yea I'm the same way, buy some modules just because I'm curious about them and want to test, and never end up deploying them. I definitely appreciate the fact check 👍

It will be the on resistance of the mosfets multiplied by the current.

@@JulianIlett I would still like to see what that turned out to be in your setup as you did not mention the device characteristics and even if you had, the implimentation could have some impact.

@@JulianIlett Yeahbut, who's to say it isn't just as bad as the first one you tried?

@@JulianIlett R(on)? On a data sheet sure. But who just blindly trusts that?

Yes, that voltage drop while charging is the most important thing to measure. Surely the whole purpose of an "ideal" diode is its much lower forward voltage drop than a conventional one. Any conventional diode, even a Schottky, will have a low enough reverse leakage to be of no consequence in this application.

I have a board with an LTC4352 and paralleled MOSFETs which I have never soldered up - maybe now is the time?

Hi, it would be cool if you could Help me out as i have a hard time understanding. Every FET has a body diode. So ist conducts in the opposite Direction compared to the Direction it is steerable. If i put two in reverse series, it seems to me that the current has to cross a body diode in one of them at least right?

@@knopfkrieger the body diode is just a parallel diode inside the body of the FET. It's an unfortunate downside of the design of FETs. As long as you can pump enough charge into the gate, with many FETs you can put them in backwards, so flipping around the drain and source. So yes, absolutely, reverse series works and is quite common, particularly with N channel. Personally I used it to protect a battery and fuel cell which were hybridised in parallel, both of which don't like uncontrolled back feeding. This required a bidirectional break in the current, like a relay would provide but I needed high frequency (kHz). FETs only provide one way breaks due to this body diode. Unless you put two in reverse series then job is good if you can tolerate the reverse leakage through the side of course

So i use the mosfet the "wrong" way round normally and in the event of a reverse current the "right" direction working of the FET Kicks in and protects as you would expect with 0 gate source voltage ?

@@knopfkrieger you should look up the design of an "ideal diode" which uses a FET and is sort of what you're describing. Yes it can absolutely be used in this way. Like everything it depends on the FET and the circuit you choose. Sometimes it may take too long for the gate to charge/discharge in this design so it becomes dangerous, depending on the use case. So you often see a charge pump to speed up the reaction time and make it more decisive

Usually in a Ideal Diode is 0.02V

One of these days a seagull may open his shed 😃

Sounds dangerous. Lithium is not a toy!

@@mrtechie6810 Not as dangerous as having an open fire in the house, yet we did it for thousands of years.😄

@@CANTON76A well, no one stops you then. Hope you live alone though!

If the sources of back-to-back high efficiency trenchfet NPN Mosfets are on the high side, it is mysterious to me how the device is generating a full gate activation charge, like Source(+) + 12V. Diode Ladder? Seems it would have to steal a little current while in forward mode to do this.

@@GnuReligion good point. i think it would need a separate supply line (P+ or P-, depending on low/high side arrangement), fed into a buck&boost circuit that can accept power from a large range of voltages and always achieve proper gate voltage . so in this way it would be kind of a pseudo ideal diode , in spirit/function... maybe as you say there's some clever power sipping method such as blanking the mosfets for minute periods to sip power into a capacitor. this algorithm would need to adapt to the pack voltage and seems complex, and technically speaking would interfere with the end goal of the device in the first place ...

@@yeliab814 The way I do this at home, to make a circular battery pack (dynamically leaving the weakest cell out), is with Cockcroft-Walton multipliers. One can semi-isolate a reservoir charge grounded on each mosfet source. Takes a lot of caps. If they are doing something similar here, a lot of little caps would be the giveaway. Gotta wonder if this ideal diode will work down to 3V?

roughly 5WHr but I am highly suspicious of my math.

But it goes against the whole concept of letting Amps from the batteries to the panels, when it's supposed to go the other way. It's simply a bad mpp design that accept this do happen. So stoping this behaviour are only the right thing to do 👌

Whats your advice to set 6 panels each 100w

Or could just be my 18V heat gun in a cold office :)

What's odd about that green board is that none of the components has any connection to ground. Last time I looked at it, I came to the conclusion that it can't possibly work (other than being a diode). Perhaps it warrants another look :)

@@JulianIlett what is the part number on the fets? is it p-channel or n-channel?

75NF75 which I believe is N channel.

@@JulianIlett then the schematic shoudl be soemthing like this: i.stack.imgur.com/a4mNC.png

@@JulianIlett then look for a P+ connection rather than ground, no?

Don't think you can buy them anymore

@@joshuabest100 Ya I already started looking. I only want it for the branding lol

That reminds me - I have a Parkside (Lidl) multimeter in a box somewhere. I need to do a review on it.

Irony when searching for the meter two results were to your videos

I'll take another look at the green module in due course, but I suspect it's 'fake'.

No. If it did you wouldn't be able to discharge the battery at all.

Ya, I wonder what the specs say about that first one. Just like the ideal diode he used, it will have a minimum voltage and it has only likely 4-6V in his first test set up.

The voltage drop of most diodes is about 0.6v no mater what voltage you run it at. That is a smaller percentage of 12v so it is more efficient at higher voltages. But it is still going to be about a drop of 0.6v

@@ecospider5 A MOSFET acts as a very low impedance resistor when switched on. The forward voltage drop will be dependant on the current but will be very low even at high amperage. These circuits try to be an 'ideal diode' i.e. zero ohms forward and open circuit reverse and without any forward bias voltage drop. HTH.

There might be a reverse voltage diode, but forward diodes are not common. One panel will put out 10 amps, at 0.7V diode drop the diode will burn 7 watts.

The panel will have bypass diodes, but not a series diode.

I mine into the Prohashing pool. It switches between Litecoin, Digibyte and a number of others automatically, whichever is most profitable. I can choose to get paid in any of 100 or so coins, or a mix of coins, and I can set the percentage mix.

I'm still using mine from 1966 - wouldn't be without it....

Antmining (with the right machine) ~ 20p/kWh Grid export ~ 5p/kWh.

You can get different prices when you backfeed the grid and there are different efficiencies with miners. So the simplest answer is if mining without solar is profitable then it is probably more profitable to mine than to backfeed the grid.

A lot of people have solar that can not backfeed the grid so any extra power goes to waist. If you pump that waist into a miner it makes you money instead of doing nothing. This allows you to put up enough solar for the winter but then mine with the extra unused power in the summer.

@@JulianIlett thank you

You'd certainly need a solar charge controller (specifically one with a DC/DC converter) if you put two 60-cell panels in series. But even if your panels are in parallel, you need a way to prevent the batteries being overcharged. My 60-cell panel has an open circuit voltage of up to 36V (when it's cold). That corresponds to 4.5V per cell for an 8-cell pack (more if they're out of balance). My Antminer will switch on when the pack voltage reaches an upper threshold (and off at a lower threshold) which will prevent overcharge and over discharge.

@@JulianIlett surely the bms will handle that? Thanks for the input. Ps my battery will be 320ah and used daily running various loads. I have a load more panels to wire in parallel to increase the current. I also have an active ballencer I could use.

I've come to the conclusion the BMS doesn't so much 'manage' the battery as protect it. The upper cutoff voltage is very high (3.75V) and the lower cutoff voltage is really low (2.18V). Although some BMS's let you alter the thresholds (video on that coming soon).

@@hunter00047 I didn't see a BMS in use....is it hiding?

Well you're no fun.

That's the one :)

I thought the same when I watched it back. So no soldering in the next couple of videos :)

I did actually learn this "the hard way". Molten cable insulation and molten xt60. Kept adding solar panels without beefing up the wiring. House not burned down luckily.

Code is based on multi core wiring embedded in structures and typically involves at least 50% derating over free air conditions, 12awg single core is rated 34A. Having said that I'd certainly be looking at something beefier.

@@Steve_Coates Good to know. Thanks!

To ban Bitcoin, you'd have to ban the internet!

@@JulianIlett #BanBanningBitcoin

I think you mean ban sociopaths. Like the massive Chinese bitcoin mining operations running on coal and diesel. Mining on solar is perfectly fine. Although yes, there are newer cryptocurrencies that do a better job of keeping rich people from ruining things for everyone

@@JulianIlett ACTUALLY, I really don't. That is some deluded libertarianism.

@@alakani Not at all, ACTUALLY all energy has a cost including solar, this idea that it is emission free is just silly.