Hi -
I can't remember where I saw the post on using a low and high frequency inverter for an offgrid setup but it seems like an unique approach to build a system.
Does anyone use this setup successfully?
Based on expected demands of an offgrid cabin I was thinking the following as an example:
Growatt SPF 6000T DVM-MPV 120/240 (low frequency 6kw/18kw surge) + a Growatt 5000ES (high frequency 5kw 240v)
6000T would have 2.5kw - 3kw of PV connected (250v mppt limit)
5000ES would have 6kw of PV (450v mppt limit)
The 6000T is connected to the load panel (120/240) and the 5000ES would be connected to the AC IN of the 6000T and both are connected to the same battery bank (15-20kw).
The 6000T is set for Utility 1st (then solar/battery usage), which means the 5000es is powering the 6000T
Per manual the 6000T can pass up to 60A UTL AC, which should cover 90-95% of the demands.
The 5000ES is set for SOL (solar/battery/utility) and I was thinking I could have the 5000ES connected to a generator and leverage the dry contact switch for a two wire start if the batteries dropped to a certain level the generator would kick on and provide backup battery charge.
Some thoughts / questions on the setup...
1. Is there an overall improved efficiency gained with the 5000ES passing power to the 6000T?
2. If house demand exceeds 5000ES limits would the 6000T make up the difference, blend in power?
3. No need for a seperate transformer, 5000ES is always leveraging the 6000T built in transformer
4. Setup has expansion options since the the AC IN limit is greater than what a single 5000ES can supply
5. Per the manual when the 6000T is doing AC passthrough the MPPT controller and battery charging are still taking place so I assume no impact or loss?
Am I missing something..? Does this setup work as I am envisioning it or is there a gotcha that would make this a crappy idea....?
Thanks!
I can't remember where I saw the post on using a low and high frequency inverter for an offgrid setup but it seems like an unique approach to build a system.
Does anyone use this setup successfully?
Based on expected demands of an offgrid cabin I was thinking the following as an example:
Growatt SPF 6000T DVM-MPV 120/240 (low frequency 6kw/18kw surge) + a Growatt 5000ES (high frequency 5kw 240v)
6000T would have 2.5kw - 3kw of PV connected (250v mppt limit)
5000ES would have 6kw of PV (450v mppt limit)
The 6000T is connected to the load panel (120/240) and the 5000ES would be connected to the AC IN of the 6000T and both are connected to the same battery bank (15-20kw).
The 6000T is set for Utility 1st (then solar/battery usage), which means the 5000es is powering the 6000T
Per manual the 6000T can pass up to 60A UTL AC, which should cover 90-95% of the demands.
The 5000ES is set for SOL (solar/battery/utility) and I was thinking I could have the 5000ES connected to a generator and leverage the dry contact switch for a two wire start if the batteries dropped to a certain level the generator would kick on and provide backup battery charge.
Some thoughts / questions on the setup...
1. Is there an overall improved efficiency gained with the 5000ES passing power to the 6000T?
2. If house demand exceeds 5000ES limits would the 6000T make up the difference, blend in power?
3. No need for a seperate transformer, 5000ES is always leveraging the 6000T built in transformer
4. Setup has expansion options since the the AC IN limit is greater than what a single 5000ES can supply
5. Per the manual when the 6000T is doing AC passthrough the MPPT controller and battery charging are still taking place so I assume no impact or loss?
Am I missing something..? Does this setup work as I am envisioning it or is there a gotcha that would make this a crappy idea....?
Thanks!