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Some brilliantly cleaver ideas @Hedges . Sound like pro design engineer at work. Thanks for sharing them. Let me incorporate changes and come back.

Okey Guys, apologies for being away all this while. I'm in travel with limited connectivity, so please bear with me. Lots of discussions going around, trying to sum them up w.r.t the design the way I understand them:). Few changes incorporated: 1) Transistor...

Thanks @Hedges . That's the reason I opted for a 12V "Safe" portable system. No direct interference with line AC as well. I believe we are playing with a very basic and safe system - which @ max could smoke black with a "Pop" sound from some cap - nothing more. I don't know, I'm not fan of...

Not So much, just the component costs have exceeded that of a decent BMS. May be Yes. How do you suggest to go about it? Enroll @ University? If not - what did you make out of things we are trying to do here? No, I don't intend to write my thesis around physics behind functional principals of...

Here's the Spec sheet: That R7 with 47K was there just to supply replenish/leakage current of ~1mA(45-12V) to Capacitor C1-> Mosfets. My understanding is that Zeners work on Voltages and not on current. Once the substrate collapses with zener voltage put across, impurities should release all...

Ahh, got caught up with a few things;). :ROFLMAO: Absolutely, there's surely some "rush-up" work that I despise. Thanks for the fine eye! P1 is the same connection originating from first positive electrode on the battery going all the way to Balance Mosfet M4. Since resource is the same -...

It's delight to hear engineering stories and revelations behind pursuits of precision. Although its pretty obvious but never realized what it takes to put accuracy and precision into electronic components. A Big thumbs up (y) just for the passion. By the way I rearranged schematic as per...

Yes Cal, its intentional to activate balancing only during charge cycle. We can let it be there across all phases and hence the small balance current. True, trying to rearrange things so we just have to deal with one ground for internal circuitry while the other ground comes into picture only...

PV negative is not connected directly to microcontroller but it latchges to SCC ground when mosfets are activated. SCC is internally hardwired with Battery ground - which is common ground for the microcontroller also. I am not sure if we can read less than '0' volts at microcontroller inputs...

Update Thanks @BiduleOhm for the critical review. Corrected Mosfet charging mechanism by using optocouplers as drivers which shall utilize charge from PV source for the purpose. Since now multiple drivers are to fed - beefed up current from Zeeners as well. For the Voltage divider network...

Checked some of your videos. You are good at your work Brandon! What line of work do you originally belong? Would be interested to see how this Power Bank takes up the shape. TC

Hi, here's the draft schematic for 4S Cell balance module. Idea is to monitor voltage of each individual cell ( via voltage divider) and short local electrodes once voltage reaches pre-determined top charge. While exact algorithm for balancing can be done in microprocessor, dissipating...

Thanks @Hedges for all those suggestions. They are kind of on the list and more. Got LM335s for temp and Hall effect sensor for current monitoring. This board and automation control is a very late afterthought, had installed analog battery and power monitors already. Still its fun to have the...

Vds and Vds are originating from the same source - shouldn't they be at the same potential/ common reference? And once Gate saturates from Vgs and start to conduct, complete system would be at battery ground reference anyways.:rolleyes:

Here it is: Are we good to go onto the next module (y)

With Changes incorporated: Anything else remains to be checked/ optimized? ??

So in our case if Source Voltage is +45 and Gate Voltage is +12V -> that leave a bandwidth of ~33V for Drain channel to be active. Even in the case both voltages are non-isolated(share common ground), with a PD of >10 volts across the bridge - shouldn't this work? My understanding was that as...

Shouldn't that be like how an SSR works? Hmm...thinking... Well the second source we have is batteries but then it again would be shorting its ground with SCC and eventually the PVs - so wouldn't be completely isolated either. I'm still trying to clear this up - are Vds and Vgs relative or do...

As said we have Solar Panels delivering isolated drive supply through optocoupler. P-Channel FETs have a much higher RDS(on) for 30Amp load in comparison with N-Channel. But yes the implementation would have been easier.

Thanks for you suggestions @Hedges & @BiduleOhm. Did some sketching of the schematic are here are the thoughts: +5V, 40mA signal from microprocessor is reduced to 1.4V, 20mA that drives the IC817 optocoupler, acting as switch. Isolated +12V is fetched from PV panels via Zener @1mA and fed to...

Here's the link to the new Thread: https://diysolarforum.com/threads/all-in-one-solar-generator-diy-control-board.10831/ Lets continue there. Thanks!

I've been working on a DIY mobile all-in-one solar generator system since some time. Must of the hardware has gone into the enclosure and is functional in a very basic sense. However, integrating multiple generic modules to work together seems more like a Frankenstein's blueprint. While I am...

Many thanks for this. Would go through and check how its implemented, this may be the only way to go - else how would one drive nested NPN Mosfets? Doesn't seem possible with linear logic.

Originally circuit was suppose to Isolate PVs from SCC when they were not needed by the system. This was bases on following requirements: 1) As a check to verify batteries were in place "before" any charge from PVs could hit SCC. (Idea was to drive relay and then later SSR Mosfets from...

:ROFLMAO::ROFLMAO::ROFLMAO: Looks like those components are few but the mess they have created is the exponential square of probability for incorrect combinations possible in the entire universe. Literally can't stop laughing at the critique's review analysis:LOL: I value your time gentlemen and...

I believe we need at least 100mA current to drive those Power Mosfets - Each takes about 250nC charge to get active. But then we're capped by that Zener. So may be with 500mW limits, it is supposed to be 10K (For a parallel config) - would hardly drive 10mA though. Any comments on Parallel...

Here's a better schematic of things we discussed yet, however more modules are in process. This would help translate things better I suppose. Please have a look and let know what you think. Regards

I think the schematic is not so clear, would try to get a better one soon.

I'm trying to keep a common ground reference for all components, because multiple modular functions are expected - which would go haywire if voltage reference is not identical. However having said that I'm no expert either on circuit design so would need support to filter out blunder (if any) on...

I recon may be 'Dee Thames', like the thames of london ?.

Yes, I've heard quality BMS(s) are expected to stop charging at sub zero, but not so sure of the discharge aspect. May be you can check how your BMS is designed/configured by running some tests initially.

Okey, that could be one of the alternatives but I am still trying to decipher - why do we need an Isolated supply for gate driver? Can we not use something like this, its a non-isolated boost converter - small on power requirements:

You need not essentially have a parallel "system" for housekeeping of the primary one. May be those additional Panels could go into the primary setup itself (where they could be utilized most) but just have some way to keep the secondary battery charged via primary bank for emergency use. There...

Brilliantly put together. That Isolated driver voltage is not clear to me, why do we need to have it isolated - couldn't it be part of the same circuitry? Using common ground, negative reference errors also get cleared out. Those $3 converters get ridiculously expensive getting here (USD $30...

Mosfets are based on Input voltage of SCC ~ 45 V for an open circuit and selection is from whats is readily available here in the market. If you have something specific in mind, please share but availability becomes an issue generally. 1) 75V, 130A is IRF1407 -> Rds On 7.8mOhms Rja-> 62 °C/W...