Hey folks,
First off, thanks to this great community for the excellent assistance and knowledge; it has been immensely helpful in learning and designing a system.
Secondly, After a few dozen/hundred hours of videos and internet reading, I think my design is at a stage where feedback is needed and I have a few questions.
Location: Southern California. Lack of sunny days is not an issue.
General Load and Use Cases for the System:
Backup for Home (refrigerator, freezer, other necessities) when the power is out
and
My commute is ~40 miles each day and the power generated can top off my Nissan Leaf each night via the 120V Level 1 Charger (speed of charge is not an issue for me) from the Battery Bank, and then finish with any grid power as needed.
Summary of Questions Below:
Question 1:
Solar Panel Math Check:
6 Used San San Solar Panels
https://store.santansolar.com/product/santan-solar-t-series-250w/
Or
https://store.santansolar.com/product/santan-solar-t-series-250w/
250W
VOC (Open Circuit Voltage): 37.6
VMP (Max Power Voltage): 30.3
Max Power Current: 8.27
Fuse: 15A
Wired: (Amounts rounded up)
3s2p
1500W
VOC: 115
Total Amps: 25
QUESTION: IS THIS MATH CORRECT? I just want to make sure I’m not going to blow out the Growatt/cause fire, etc.
Question 2: Do I need a breaker/disconnect between the solar combiner box and the Growatt?
Low Priority Question 3: Can I use this Victron Charger only hooked to the Negative to also use the monitoring software?
https://www.amazon.com/Victron-Blue-Smart-Charger-Waterproof/dp/B07DWJD84N
Answered: Need the shunt.
If possible, this would give me a charger and a monitor in 1 unit instead of purchasing 2 different pieces of hardware and I would just eliminate the shunt and replace it with a fuse instead.
System Build Details for Reference - Feedback, Critique and Suggestions welcome.
Thanks in advance for any comments or feedback to help improve this first attempt at a plan.
Inverter: Growatt SPF 3000TL LVM
https://watts247.com/product/spf-3000tl-lvm-24p/
Mounted to Hardibacker:
https://www.homedepot.com/p/James-H...-x-1-4-in-Cement-Backerboard-220022/100183556
INPUTS:
PV:
6 Used San San Solar Panels
https://store.santansolar.com/product/santan-solar-t-series-250w/
Or
https://store.santansolar.com/product/santan-solar-t-series-250w/
250W
VOC (Open Circuit Voltage): 37.6
VMP (Max Power Voltage): 30.3
Max Power Current: 8.27
Fuse: 15A
Wired: (Amounts rounded up)
3s2p
1500W
VOC: 115
Total Amps: 25
Into a 4-1 Solar Panel Combiner Box
https://watts247.com/product/solar-panel-combiner-box-4-circuits-to-1/
From Combiner Box -> Growatt
AC In:
Cut and Spliced AC Extension Cord to closest outlet
Planning to use:
https://www.amazon.com/Foot-Lighted-Outdoor-Extension-Cord/dp/B019P9ZGGO/
Batteries:
Two 12v 206AH LiFePOP4 (already on hand)
https://www.currentconnected.com/product/sok/
Wired in Series to get 24v
Specs:
Recommended Charge: 40A
Max Charge: 50A
Recommended Charge Voltage: 14.6v
Wire: 4 AWG
https://www.amazon.com/dp/B01F32MM46/
Battery Negative to Victron Shunt 500A:
https://www.altestore.com/store/met...s/victron-energy-smart-battery-shunts-p41526/
Shunt to Growatt
Positive to Disconnect Device: Blue Sea Systems 300A Battery Switch
https://www.amazon.com/Blue-Sea-Systems-Battery-Switch/dp/B00445KFZ2/
Disconnect to Growatt
OUTPUTS:
AC Out:
Wired to QO Breaker Box:
https://www.homedepot.com/p/Square-...c-Enclosure-and-Neutral-QO24L60NRNM/100174454
20A GFCI Breaker:
https://www.homedepot.com/p/Square-...le-GFCI-Circuit-Breaker-HOM120GFICP/100002959
To 4x4 Outlet Box
Outlets: https://www.homedepot.com/p/Leviton...t-Duplex-Outlet-White-R52-T5825-00W/203245679
Outlets power the load
First off, thanks to this great community for the excellent assistance and knowledge; it has been immensely helpful in learning and designing a system.
Secondly, After a few dozen/hundred hours of videos and internet reading, I think my design is at a stage where feedback is needed and I have a few questions.
Location: Southern California. Lack of sunny days is not an issue.
General Load and Use Cases for the System:
Backup for Home (refrigerator, freezer, other necessities) when the power is out
and
My commute is ~40 miles each day and the power generated can top off my Nissan Leaf each night via the 120V Level 1 Charger (speed of charge is not an issue for me) from the Battery Bank, and then finish with any grid power as needed.
Summary of Questions Below:
Question 1:
Solar Panel Math Check:
6 Used San San Solar Panels
https://store.santansolar.com/product/santan-solar-t-series-250w/
Or
https://store.santansolar.com/product/santan-solar-t-series-250w/
250W
VOC (Open Circuit Voltage): 37.6
VMP (Max Power Voltage): 30.3
Max Power Current: 8.27
Fuse: 15A
Wired: (Amounts rounded up)
3s2p
1500W
VOC: 115
Total Amps: 25
QUESTION: IS THIS MATH CORRECT? I just want to make sure I’m not going to blow out the Growatt/cause fire, etc.
Question 2: Do I need a breaker/disconnect between the solar combiner box and the Growatt?
Answered: Need the shunt.
System Build Details for Reference - Feedback, Critique and Suggestions welcome.
Thanks in advance for any comments or feedback to help improve this first attempt at a plan.
Inverter: Growatt SPF 3000TL LVM
https://watts247.com/product/spf-3000tl-lvm-24p/
Mounted to Hardibacker:
https://www.homedepot.com/p/James-H...-x-1-4-in-Cement-Backerboard-220022/100183556
INPUTS:
PV:
6 Used San San Solar Panels
https://store.santansolar.com/product/santan-solar-t-series-250w/
Or
https://store.santansolar.com/product/santan-solar-t-series-250w/
250W
VOC (Open Circuit Voltage): 37.6
VMP (Max Power Voltage): 30.3
Max Power Current: 8.27
Fuse: 15A
Wired: (Amounts rounded up)
3s2p
1500W
VOC: 115
Total Amps: 25
Into a 4-1 Solar Panel Combiner Box
https://watts247.com/product/solar-panel-combiner-box-4-circuits-to-1/
From Combiner Box -> Growatt
AC In:
Cut and Spliced AC Extension Cord to closest outlet
Planning to use:
https://www.amazon.com/Foot-Lighted-Outdoor-Extension-Cord/dp/B019P9ZGGO/
Batteries:
Two 12v 206AH LiFePOP4 (already on hand)
https://www.currentconnected.com/product/sok/
Wired in Series to get 24v
Specs:
Recommended Charge: 40A
Max Charge: 50A
Recommended Charge Voltage: 14.6v
Wire: 4 AWG
https://www.amazon.com/dp/B01F32MM46/
Battery Negative to Victron Shunt 500A:
https://www.altestore.com/store/met...s/victron-energy-smart-battery-shunts-p41526/
Shunt to Growatt
Positive to Disconnect Device: Blue Sea Systems 300A Battery Switch
https://www.amazon.com/Blue-Sea-Systems-Battery-Switch/dp/B00445KFZ2/
Disconnect to Growatt
OUTPUTS:
AC Out:
Wired to QO Breaker Box:
https://www.homedepot.com/p/Square-...c-Enclosure-and-Neutral-QO24L60NRNM/100174454
20A GFCI Breaker:
https://www.homedepot.com/p/Square-...le-GFCI-Circuit-Breaker-HOM120GFICP/100002959
To 4x4 Outlet Box
Outlets: https://www.homedepot.com/p/Leviton...t-Duplex-Outlet-White-R52-T5825-00W/203245679
Outlets power the load
Last edited: