diy solar

diy solar

Growatt 5000?

JVKNL66

New Member
Joined
Jul 19, 2021
Messages
14
Hello, I want to put panels on my roof (max. 11 or 12) with a Growatt 5000 ... and this battery EG4 Budget Model 48V. I never need more than 5000W at the same time. So my question is if anyone can say what I need? These Growatt things look easy and I would like to be able to bye each 3 months an extra battery till i have 4. Is that posible and what panels do i need? 12 v or 24 or 48 or 700 I really dont know. Thank you for responding. AAAH something else. My house is in Granada, Spain. Lot of sunny days a bit cold in the winter and in the summer a lot of days near 40C degrees. Something else: First i will use the grid 240V but next year I will not anymore with 4 batteries of each 5kWh. These are the solarpanels which I can find in Spain: https://autosolar.es/paneles-solares Please anyone???
 
Last edited:
Maximum PV open circuit voltage for Growatt 5000 is 450volts.
Choosing 12 panels in two series strings of 6, panel open circuit voltage needs to be less than 75 volts.

Looked at your panel link but my Spanish...
 
Maximale PV nullastspanning voor Growatt 5000 is 450 volt.
Als u 12 panelen kiest in twee reeksen van 6 reeksen, moet de open circuitspanning van het paneel minder dan 75 volt zijn.

Ik heb je paneellink bekeken, maar mijn Spaans...
Gweldig dat u heeft gevraagd :)). Alvast bedankt!!
 
thank you very much for your information! :) So what do I need to buy?? 12 from 12 or 12 from 24 or 12 from 48? How much watt? per panel? Can I charge 4 parallel 5kWh batteries with the Growatt 5000? Thank you for your time!
 
48 VDC panels will do and no more than 6 in series and as big as 6000 watts total. The Growatt can charge as many batteries as you want 20 or more it will take more time to fully charge the more batteries you add think days.
 
That means that I buy 12 48 V panels and put them twice in series of 6. If the panels are each 400 W max it would mean 273 per string of 6 and a total of 4800W?That means I could even take 12 panels from almost 500W/
 
Yep, The 273 you are referring to is voltage. The 48 VDC panels I have been messing around with have an open circuit voltage of 60 VDC and when it is cold it will be higher You do not want to exceed the 450 VDC of the Growatt.
 
But why is a 60VDC-panel a 48V-panel? 48 is 48! And why take 48 V panel on the Growatt instead of a 24 or 12?
 
Last edited:
But why is a 60VDC-panel a 48V-panel? 48 is 48! And why take 48 V panel on the Growatt instead of a 24 or 12?
Solar cells have high internal resistance and will be 48 VDC when you start drawing power from them but with no load, the voltage will shoot up. You can use any volt panel you like but the higher volt panels will not need larger wire to carry the amps that lower panels make and long runs with larger wire can get expensive.
 
Solar cells have high internal resistance and will be 48 VDC when you start drawing power from them but with no load, the voltage will shoot up. You can use any volt panel you like but the higher volt panels will not need larger wire to carry the amps that lower panels make and long runs with larger wire can get expensive.
And if I never use the Grid anymore do I need a Growatt 5000? or is there a model same easy to use cheaper than 1500 Euros? I would connect it to my house and disconnect the grid thats it.
 
And if I never use the Grid anymore do I need a Growatt 5000? or is there a model same easy to use cheaper than 1500 Euros?
How much power do you use now? I do not know what is available to you as you are in Spain the Growatt 5000 is $900 here.
 
How much power do you use now? I do not know what is available to you as you are in Spain the Growatt 5000 is $900 here.
my home has a 5kw contract. I never used more than that. Please send link from model Growatt. But does it have the Charging facilities?
 
I think this panel is a good choice:
- Voltaje a máxima potencia (VMP): 41,5V
- Corriente a máxima potencia (IMP): 10,85A
- Voltaje en circuito abierto (VOC): 49,3V
- Corriente en cortocircuito (ISC): 11,60A
- Eficiencia del módulo: 20,7%
 
I think this panel is a good choice:
- Voltaje a máxima potencia (VMP): 41,5V
- Corriente a máxima potencia (IMP): 10,85A
- Voltaje en circuito abierto (VOC): 49,3V
- Corriente en cortocircuito (ISC): 11,60A
- Eficiencia del módulo: 20,7%
Thank you for your reply Fega 72! Is it also to do 2 times 6 in serie?
 
Yes.
295.8V open circuit voltage and 5400W max, you will be within the specifications (120V-450V and 6000W)
Do you know what model Growatt I need from 5 or 6 kW totally offgrid with max use of 4 batteries total 20kW?
 
Back
Top