Electronics > Power/Renewable Energy/EV's
Technology inside Tesla Powerwall
reagle:
Hmm, how would one use it with a grid tied system using ACPV panels? Looks like I'd have to take its output, feed it into a dedicated inverter then somehow feed that into combiner box that connects to my array? Sounds like it'd break all kinds of anti-islanding rules
station240:
--- Quote from: reagle on February 03, 2016, 01:52:23 am ---Hmm, how would one use it with a grid tied system using ACPV panels? Looks like I'd have to take its output, feed it into a dedicated inverter then somehow feed that into combiner box that connects to my array? Sounds like it'd break all kinds of anti-islanding rules
--- End quote ---
Ah we call those tiny inverters on the back of panel Micro Inverters, real problem for use with batteries.
Easy solution would be to connect a battery charger to the mains, set to only run when there is excess solar power. Then run another inverter off the battery to power the house. You can get all in one units with the charger and inverter in one box.
Aternative option is to replace the micro inverters with a set Solar Edge Power Optomizers, and their related big inverter.
http://www.solaredge.com/groups/powerbox-power-optimizer
I recall their system is one of the few that work with the Powerwall, not cheap however.
AndyC_772:
Modbus? Really? Out of choice, in a world where at least one protocol that's not Modbus exists?
(For those unfamiliar with it, Modbus is a multi-master serial interface, a bit like RS485. The end of a message is indicated by a time gap 3.5 characters long - no more, no less - and replies from slave devices contain no information about what they're actually replying to... just their own device ID, length, data and CRC).
mtdoc:
--- Quote from: AndyC_772 on February 03, 2016, 09:15:13 am ---Modbus? Really? Out of choice, in a world where at least one protocol that's not Modbus exists?
--- End quote ---
For better or worse, I believe it's the standard communications protocol used in the RE industry.
mtdoc:
--- Quote from: station240 on February 03, 2016, 08:48:53 am ---
--- Quote from: reagle on February 03, 2016, 01:52:23 am ---Hmm, how would one use it with a grid tied system using ACPV panels? Looks like I'd have to take its output, feed it into a dedicated inverter then somehow feed that into combiner box that connects to my array? Sounds like it'd break all kinds of anti-islanding rules
--- End quote ---
Ah we call those tiny inverters on the back of panel Micro Inverters, real problem for use with batteries.
Easy solution would be to connect a battery charger to the mains, set to only run when there is excess solar power. Then run another inverter off the battery to power the house. You can get all in one units with the charger and inverter in one box.
--- End quote ---
The common way to do it is to create what is called in the solar PV industry an AC coupled system.
The big obstacle for incorporating the Tesla Powerwall into a standard battery back up (or off grid) system is that the voltage is too high for the currently available battery based inverters.
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