DCDave
New Member
- Joined
- Sep 15, 2020
- Messages
- 14
We are starting this off grid project with the following equipment just received:
Parts, starting place;
* 40' container located at 6800' Summer 97 degrees, Winter 10 degrees.
* Growatt 3000w 120v output, 48vdc input from Watts247
* 20 solar panels, 327w used Sunpower
* 800KW Lithium, 48v BMW batteries, from Battery hookup
* 2awg cables with disconnect below the panel, 60w breakers on each of the two battery packs to de-rate them a bit.
* Plan to string second Growatt 3000 to add input charging and run the AC on camper next summer.
Loads:
* Small RV Camper, one AC unit, microwave
* Charging battery powered tools
* Laptop
Unkowns:
How to group and connect the 327w solar panels to not exceed voltage limitations.
* 80A MPPT / 6.5Amps per solar panel + 12.3 panels.
Growatt's limitations.
* 48v
* Input 80A MPPT
* Input 40 from Generator
Solar panels limitations;
* Rated power max 327 Watts
* Voltage 54.7 Volts
* Current Input 5.98 Amps
* Open circuit VOC 64.9 Volts
* Max series fuse 15 Amps
** By my calculations, I can only attach 12 panels to the Growatt 3000w. Even if I chose the 6000w unit I gain 220v AC but can only attach some 15 of my 327w panels. I am not sure which is the better option.
Parts, starting place;
* 40' container located at 6800' Summer 97 degrees, Winter 10 degrees.
* Growatt 3000w 120v output, 48vdc input from Watts247
* 20 solar panels, 327w used Sunpower
* 800KW Lithium, 48v BMW batteries, from Battery hookup
* 2awg cables with disconnect below the panel, 60w breakers on each of the two battery packs to de-rate them a bit.
* Plan to string second Growatt 3000 to add input charging and run the AC on camper next summer.
Loads:
* Small RV Camper, one AC unit, microwave
* Charging battery powered tools
* Laptop
Unkowns:
How to group and connect the 327w solar panels to not exceed voltage limitations.
* 80A MPPT / 6.5Amps per solar panel + 12.3 panels.
Growatt's limitations.
* 48v
* Input 80A MPPT
* Input 40 from Generator
Solar panels limitations;
* Rated power max 327 Watts
* Voltage 54.7 Volts
* Current Input 5.98 Amps
* Open circuit VOC 64.9 Volts
* Max series fuse 15 Amps
** By my calculations, I can only attach 12 panels to the Growatt 3000w. Even if I chose the 6000w unit I gain 220v AC but can only attach some 15 of my 327w panels. I am not sure which is the better option.