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JohanB

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  1. Yep even me! It does still come in handy to have the background knowledge of things like hex. Think today it might be a lost art.
  2. Great info will keep that in mind!
  3. Yes, this was indeed a huge help, understanding number systems, and endian-ness. I remember the days before Arduino's when I first started to mess around with micro controllers, PIC16's having to print out a datasheet with the instruction set, and code the thing in Assembly. Not that I would go back to that using the Modern IDE's and high level languages makes things allot easier. Amazing, exactly what I was looking for a great start, now I just need to populate the values with "real" values.
  4. Wow Today I learned! Never too old to learn something new hey. Very interesting thread... Also as an aside. @plonkster I have manged to decode the Arduino sketch, you provided me in the other thread. 023a 570 Charge Voltage: 57V 0064 100 Max Charging Current: 10A 0064 100 Max Charging Current: 10A 01a4 420 Discharge Voltage: 42V 0032 50 SOC 50% 0064 100 SOH 100% 0000 0 SOC high definition 0 * 0.01% 14b4 Battery Voltage: 5300 * 0.01V = 53V 0064 Battery Current: 100 * 0.01A = 10A 00f0 Battery Temp: 240 * 0.1c = 24c These values look familiar/correct? So in essence my idea is to make a "smart" module for any "dumb" BMS like the Daly. The current version will not have individual cell reporting, however it will have Bluetooth and Wifi, probably MQTT and CAN-Bus support. Anyway sorry to derail the thread. /me drops ninja dust...
  5. I could not find a price for a SunSynk, but I found the Deye https://www.solarpanelenergy.co.za/p/958862/5kw-deye-hybrid-inverter it was listed as R 21850.00 (dont know if it is a good price). If someone has a good price on a SunSynk in South Africa let met know, so we can compare. I would assume a Victron system would be quite a bit more?
  6. Does anyone know if the Deye's and SunSynk's are identical, firmware etc... I have been looking at this one: https://www.solarpanelenergy.co.za/p/958862/5kw-deye-hybrid-inverter
  7. Thanks will look into it. If I recall correctly the sunsynk is a Deye? this is actually one on my list...
  8. Great explanation makes a whole lot more sense now... So the real answer, as with so many things, is it depends. At this stage I think implementing a compatible can-bus interface seems like a better option... By reading here and doing research elsewhere I understand it as you refer to it as a “true hybrid” but it is so confusing as sellers of the equipment and by extension the manufacturers, refer to it as Hybrids. I found a neat trick is to use the City Of Cape town’s list of approved inverters as they list only true hybrids. and grid-tied.
  9. Yes I ordered a pre-built unit, so it includes a 120A BMS all the necessary protection but no Comms. so My idea would be to build or buy a way to do comms.
  10. Exactly what I was wondering about. If they are stating can-bus and they mean rs485...
  11. I saw this it *looks* like an axpert not sure though... https://www.solarpanelenergy.co.za/docs/Synapse 50 48V OffGrid Inverter.pdf It mentions Can-Bus I now saw in the product description:
  12. So if I understand it correctly and please correct me if I am wrong. If I manage to implement the protocol I would not need something like ICC, because the inverter would manage the battery better opening up some of the "nice to have" features you spoke off. Or alternatively I could use BMV7xx and ICC?
  13. Great info thanks. Sounds like I have some nice weekend reading to do! Now I need to source a MCP2515 breakout. Lol, Oh and I need to get an Inverter...
  14. Awesome thanks, The Esp32 supports the Arduino IDE so this would be a great starting point. Had a look at the sketch just need to figure out what messages are exchanged between the battery and inverter. Would it just be SOC or would info about individual cells etc also be sent? How complex is such a protocol (minimum features). Then obviously if I use a BMV7xx or DIY, would it be better to use the canbus emulation method or just talk to the inverter via venus or icc? Is there benefit to using one method or the other? Is there a standard battery comms protocol and if so any documentation I could refer to, seeing as there is a load of hex in the sketch or Magic Numbers that don't mean much at this stage. I would assume the battery speaks it's protocol independently of the inverter and the inverter manufacturers support the battery by implementing the protocol so a generic implementation of said protocol would enable me to communicate with different types of inverters. Might be a project worth pursuing. Also this is probably 2 different topics sorry, but I would also still need inverter recommendations seeing as the battery will have no one to talk to.
  15. Hi, I have been lurking on here for quite some time, but have finally decided to take the plunge and join the community and the bandwagon. I need some advice and shoving in the correct direction. After countless SLA replacements and unreliability, I have decided to get myself sorted with a proper solution. So I have ordered a big boy battery from @Bain Viljoen and am now in the market for a suitable inverter. So my understanding thus far is that Bain's batteries has a suitable BMS for protection but that it does not provide comm's. I have read other posts where wise men like @plonkster have mentioned the bare minimum a BMS should do and I think it covers that. Then he mentioned nice to haves. My plan would be to build or buy a bmv7xx type system. Diy would be to use a Microcontroller like the esp32 with a 200A shunt to measure accurate SOC and Draw and then feed this into a Raspberry Pi like Venus Os or icc to replicate the Nice to haves @plonkster spoke about. Not sure how this would work I don't know if I would have to emulate a known battery BMS comms protocol and by using CAN or rs485 feed it into the inverter, or if something like ICC or Venus would be better. Also I would use this to feed into my existing NodeRed network via mqtt for monitoring and controlling of Sonoff's and Grafana. I also think that a 5Kw 48v system would be sufficient. Later plans include to do gas hob and maybe solar geyser. But for now I need a solid inverter to supply backup loads when there is load shedding or outages. Then as a second phase to add solar and depending on the chosen inverter (hybrid or off-grid) add a second grid-tie inverter. So keeping in mind the above mentioned BMS plans, my battery and also adding that I would like to do solar at some stage later but I would like to do it in phases and the fact that I am willing to tinker, what are some recommendations of inverters that would best match my requirements. The only constant at this stage is the 6kwh battery from @Bain Viljoen Thank you if you made it to here. I welcome any and all comments regarding this.
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