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What controllers?
#11
(02-15-2019, 11:28 AM)daromer Wrote: The big difference between LA ability to self balance compare to a BMS on a lithium is that a LA can take a higher current without issues and they balance faster meanwhile you easily saturate the max current a BMS can take before it cant keep up with charge.

Aka a BMS can take for instance 500mA and above that the voltage will raise meanwhile a LA battery just regulates it rather fast. Thats why lithium batteries need disconnect function and preferable proper feedback to the charger to regulate it towards the end.

Unfortunately not many are aware of this and how it works.

Batrium for instance have this function built in and can manage several inverters and chargers. Victron also have support for this on some models.

So are there any solutions for what I am looking for? It's strange that so many people have this setup but I can't seem to find what exactly they use. Examples from HBPowerwall are different because I am in the US. Ill include a diagram of my system. I am looking to push to batteries during the day and then either manually or preferred automatically pull from them at night until they drop low enough to then switch to grid w/o interruption. I have heard of systems doing this but no details for the equipment they use. Maybe its made up but I am trying to figure out how they did it. Either way 5kw system into a sunny boy 5kw grid tie inverter, somehow I should be able to add batteries to this mix (I think). 
I am ok with Batrium system, I do like the monitoring that HBP has shown in his vids. How do I tie that into a charge controller I guess?

This diagram only shows 3KW, the system has 5kw now

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#12
(02-15-2019, 12:31 PM)DIYResto Wrote: So are there any solutions for what I am looking for? It's strange that so many people have this setup but I can't seem to find what exactly they use. Examples from HBPowerwall are different because I am in the US. Ill include a diagram of my system. I am looking to push to batteries during the day and then either manually or preferred automatically pull from them at night until they drop low enough to then switch to grid w/o interruption. I have heard of systems doing this but no details for the equipment they use. Maybe its made up but I am trying to figure out how they did it. Either way 5kw system into a sunny boy 5kw grid tie inverter, somehow I should be able to add batteries to this mix (I think). 
I am ok with Batrium system, I do like the monitoring that HBP has shown in his vids. How do I tie that into a charge controller I guess?

Have you watched daromers videos?









He shows "exactly" what he's using and how to set it up and why you want this type of system. HBPowerwalls uses another type of ATS. The one Daromer uses you can actually manually trigger it as well just by cutting the feed to one of the switches, it'll auto switch to the other load. This can be done either by your fingers, or an mcu/relay.
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#13
(02-15-2019, 02:11 PM)Korishan Wrote:
(02-15-2019, 12:31 PM)DIYResto Wrote: So are there any solutions for what I am looking for? It's strange that so many people have this setup but I can't seem to find what exactly they use. Examples from HBPowerwall are different because I am in the US. Ill include a diagram of my system. I am looking to push to batteries during the day and then either manually or preferred automatically pull from them at night until they drop low enough to then switch to grid w/o interruption. I have heard of systems doing this but no details for the equipment they use. Maybe its made up but I am trying to figure out how they did it. Either way 5kw system into a sunny boy 5kw grid tie inverter, somehow I should be able to add batteries to this mix (I think). 
I am ok with Batrium system, I do like the monitoring that HBP has shown in his vids. How do I tie that into a charge controller I guess?

Have you watched daromers videos?









He shows "exactly" what he's using and how to set it up and why you want this type of system. HBPowerwalls uses another type of ATS. The one Daromer uses you can actually manually trigger it as well just by cutting the feed to one of the switches, it'll auto switch to the other load. This can be done either by your fingers, or an mcu/relay.

I HAVE NOT! Thank you for the vids I'll watch later. Thanks for that again
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#14
You're stuck in a hard place. What you have is a Grid-Tie solution. As so it's simple to hook up and tie into the grid. That's why it's the most popular system with very few components.

So you really have two solution if you want to have battery storage involved.

First is to keep the SunnyBoy, but this is where it gets tricky. SMA makes something called SunnyStorage and I believe others can be set to work. So basically AC coupled. Essentially, you're going to use the AC to charge the battery during the day, then discharge at night. So you're not going to be able to charge the batteries directly from the Solar PV. So there's lots of losses because you're converting to AC, back to DC, back to AC.

PV --> DC --> SunnyBoy -- AC --> Mains <---> AC <---> Charge inverter <--> DC <--> Battery

It's also called load shifting and used where the time of use during nights is higher than during day. A good example of where the above technology is used is the Tesla Powerwall.


Second is to rip out the SunnyBoy and put in another controller that will handle battery operation along with grid-tie. Victron, Schneider, Outback all make these kinds of units. This way the PV charges the battery directly and only converts from DC to AC when it sends power back to the grid.
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#15
You dont need anything as clunky and cumbersome as an ATS, you just need a grid parallel ESS. This sits in parallel with your existing installation, feeding all surplus to your battery, both AC and DC coupled generation is supported.

This image depicts my home system - it doesnt show the DC and AC coupled wind, and I dont have any PV on the critical loads. I also dont use Victron batteries, just one I cobbled together. Your SMA supports frequency shifting generation control, so it'll play nicely with the Venus OS, which is open, so you dont need the expensive colour control GX, or even just a GX, as it'll run on a Pi.

Have a read of this https://www.victronenergy.com/live/ess:d...ion-manual

 

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