AZ Off-Gridder
New Member
- Joined
- Nov 25, 2021
- Messages
- 139
Application is a fully off grid residential “tiny home”.
Proposed Battery Bank is (4) 12v 300ah EnjoyBot LiFePo batteries wired in series to reach 48v. So a 14.4kw bank.
Proposed Off-Grid Inverter is the Growatt 48V SPF 3000TL LVM – 3kW All-In-One unit.
Proposed PV Array is (16) SanTan Solar T series 250w snail trails (certified used panels). [VMP 30.3v MPC 8.27a]
Wired in series of 4 and then paralleled together (hope that wording makes sense it does in my head). 30.3v X 4 = 121.2v - 15% for used panel degradation and general loss = 103v which is well below the Growatts 145vdc max PV input. Then once wired in Parallel we get an array of 103v at 33amps = 3,407w all within the Growatts Parameters. (I think)
Questions:
1. Does anyone have first hand experience on these batteries? How are they holding up for you? I’m aware of the lack of low temp charging sensor and I don’t suspect that will affect me as this will be stored inside an insulated and climate controlled home in the desert of Arizona. But I’ve heard some less than appealing information on CHINS and some say this is the same manufacturer? Same crap new name? Or is this better quality? I know Will spoke highly of them in recent video and I value his option but he didn’t go too deep into detail on how he’s used them or what applications.
2. Will this battery bank work well with the proposed Growatt inverter? If not what’s a better option of similar price and feature?
3. Am I correct in the way I’m planning to wire my PV Array? Could I add 1 more panel to each string? The math says I could but I’d be at 132v, much closer to the 145v MAX that the inverter can handle. And should I be adding in line fuses to each string?
THANK YOU to anyone who took the time to read this!! And thanks in advance for any who offer help!
Proposed Battery Bank is (4) 12v 300ah EnjoyBot LiFePo batteries wired in series to reach 48v. So a 14.4kw bank.
Proposed Off-Grid Inverter is the Growatt 48V SPF 3000TL LVM – 3kW All-In-One unit.
Proposed PV Array is (16) SanTan Solar T series 250w snail trails (certified used panels). [VMP 30.3v MPC 8.27a]
Wired in series of 4 and then paralleled together (hope that wording makes sense it does in my head). 30.3v X 4 = 121.2v - 15% for used panel degradation and general loss = 103v which is well below the Growatts 145vdc max PV input. Then once wired in Parallel we get an array of 103v at 33amps = 3,407w all within the Growatts Parameters. (I think)
Questions:
1. Does anyone have first hand experience on these batteries? How are they holding up for you? I’m aware of the lack of low temp charging sensor and I don’t suspect that will affect me as this will be stored inside an insulated and climate controlled home in the desert of Arizona. But I’ve heard some less than appealing information on CHINS and some say this is the same manufacturer? Same crap new name? Or is this better quality? I know Will spoke highly of them in recent video and I value his option but he didn’t go too deep into detail on how he’s used them or what applications.
2. Will this battery bank work well with the proposed Growatt inverter? If not what’s a better option of similar price and feature?
3. Am I correct in the way I’m planning to wire my PV Array? Could I add 1 more panel to each string? The math says I could but I’d be at 132v, much closer to the 145v MAX that the inverter can handle. And should I be adding in line fuses to each string?
THANK YOU to anyone who took the time to read this!! And thanks in advance for any who offer help!