I am investigaring inverter systems which will do:
1.Grid tie
2.Split phase 110/220vac NA power or have reasonably priced accessories to do so.
3.~5000VA continuous, with significant surge to start motors, including HVAC compressor, stackable and expandable.
4.Efficiently route (excess) solar power to battery charging or from battery based upon demand for nighttime demand, peak shaving, back up power, etc.
5.Meets US NEC code and has appropriate certifications for residential use.
6.System can safely and legally create micro grid when the grid goes down to power home.
7.Work with Bring Your Own Battery, lithium <60vdc
8.Affordable for mortals and DIYable
Operate gridtie, MPPT solar, send excess power to batteries, at night use stored battery power until batteries run down to safe level, when back up power is needed then create microgrid to run select devices including one HVAC system.
I have come across the following systems, but none of them seem to meet all the criteria.
StoreEdge, Victron, Enphase, Conext, GTIL
StoreEdge. This is on the very short list. It seems to do everything except that it requires an LG Chem ($8000) high voltage battery. Defeating the idea of Second Life Storage. But I did come across a bit of marketing guano on YouTube from Intersolar 2019 Munich.
He specifically mentions 48v 3-phase soon to come inverter with the ultimate goal to open the battery options beyond LG and BYD with no timeline, of course. I do not know how much communication is required between the StoreEdge and the battery and what would be required to get it to work with a Battrium or other nice BMS. I think the cost of the system, except for the $8000 battery, is the lowest by a nice margin, $2400 for a 7.6kva solar, 5kva battery, split phase 220v plus $400 for autotransformer, $325 for meter
The optimizer based system will also work the shading issues.
Victron. Also on the short list, but seems to be missing the US certifications for the appropriate models. Nearly all descriptions I find of these systems in NA and the stores which sell them involve an RV or boat and not a residential system. The residential installs I found were all European. This would also require 2 inverters to get split phase, doubling the cost. From what I can gather the Venus system is open sourced, which is awesome and it appears that it can be set up to be gridtied/microgrid/backup/store excess power.
Enphase. Enphase has released a lot of marketing guano around the upcoming release of its Ensemble IQ8 based system. This is probably at least a year out. It can do some cool stuff like have the inverters self regulate output while in microgrid mode based upon demand. The down side is that is uses the double inverter model. You have inverters for the solar output and additional inverters for the batteries. So in a fashion you have to purchase two inverters. It is not quite that way because during solar production time, you will get full capacity, but during battery only, you will only have capacity based upon the battery inverters.
Conext. This seems to be a common method to add battery backup to an existing gridtied system. Essentially it is a complete off grid system which sits around and comes online when backup is needed and can AC couple with some gridtied inverters. This was cool, but I need the next level and not have the additional system duplication costs.
Tesla powerwall. Um Yes, but this is DIY Powerwall, they are the inspiration and I have a bunch of batteries and afaik Tesla still does not work when the grid/internet goes down.
GTIL. Cheap! but fails many of the criteria, especially NEC code and UL certs. No storage option, no microgrid.
Does anyone have any corrections, comments or additions?
What have I missed?
I cant move forward with my battery building until I know what the specs of the inverter and the rest of the system are.
1.Grid tie
2.Split phase 110/220vac NA power or have reasonably priced accessories to do so.
3.~5000VA continuous, with significant surge to start motors, including HVAC compressor, stackable and expandable.
4.Efficiently route (excess) solar power to battery charging or from battery based upon demand for nighttime demand, peak shaving, back up power, etc.
5.Meets US NEC code and has appropriate certifications for residential use.
6.System can safely and legally create micro grid when the grid goes down to power home.
7.Work with Bring Your Own Battery, lithium <60vdc
8.Affordable for mortals and DIYable
Operate gridtie, MPPT solar, send excess power to batteries, at night use stored battery power until batteries run down to safe level, when back up power is needed then create microgrid to run select devices including one HVAC system.
I have come across the following systems, but none of them seem to meet all the criteria.
StoreEdge, Victron, Enphase, Conext, GTIL
StoreEdge. This is on the very short list. It seems to do everything except that it requires an LG Chem ($8000) high voltage battery. Defeating the idea of Second Life Storage. But I did come across a bit of marketing guano on YouTube from Intersolar 2019 Munich.
The optimizer based system will also work the shading issues.
Victron. Also on the short list, but seems to be missing the US certifications for the appropriate models. Nearly all descriptions I find of these systems in NA and the stores which sell them involve an RV or boat and not a residential system. The residential installs I found were all European. This would also require 2 inverters to get split phase, doubling the cost. From what I can gather the Venus system is open sourced, which is awesome and it appears that it can be set up to be gridtied/microgrid/backup/store excess power.
Enphase. Enphase has released a lot of marketing guano around the upcoming release of its Ensemble IQ8 based system. This is probably at least a year out. It can do some cool stuff like have the inverters self regulate output while in microgrid mode based upon demand. The down side is that is uses the double inverter model. You have inverters for the solar output and additional inverters for the batteries. So in a fashion you have to purchase two inverters. It is not quite that way because during solar production time, you will get full capacity, but during battery only, you will only have capacity based upon the battery inverters.
Conext. This seems to be a common method to add battery backup to an existing gridtied system. Essentially it is a complete off grid system which sits around and comes online when backup is needed and can AC couple with some gridtied inverters. This was cool, but I need the next level and not have the additional system duplication costs.
Tesla powerwall. Um Yes, but this is DIY Powerwall, they are the inspiration and I have a bunch of batteries and afaik Tesla still does not work when the grid/internet goes down.
GTIL. Cheap! but fails many of the criteria, especially NEC code and UL certs. No storage option, no microgrid.
Does anyone have any corrections, comments or additions?
What have I missed?
I cant move forward with my battery building until I know what the specs of the inverter and the rest of the system are.