Howdy all. First post but hope to be come an active member.
Currently designing a 24v system and like someone to look over my design and help with a charging rate question.
Our estimated usage is 2000 watts per day (some estimated, some killawatt measured). So here's the design and math.
Usage: 2000w
Inverter efficiency: .8
Total Load: 2500
Sun hours: 3.9 (south carolina)
fudge factor 1.5
Total panel wattage: 1000
Charge controller output 41.67 amps
Battery V: 6v
Capacity: 215 - golf cart
DoD: 25% <-- origin of C rate question. 20% throws me off
Bank size: 430ah (series/parallel strings) with a C rate of 10.32 - 25% DoD
Bank size: 645ah (series/parallel strings) with a C rate of 15.48 - 20% DoD
I know consulting the manufacturer is recommended but from everything I've read C/10 looks to be a safe bet. Would C/16 reduce battery life or be ill advised?
I already have some panels and the charge controller from a ham radio project no longer in use so would like to use some of what I have so here's the proposed gear:
10 grape solar 100w panels
45a MPPT charge controller
12 batteries (20% DoD) or 8 batteries (25% DoD)
Inverter to be decided - but will go with a big low frequency inverter like a MagnaSine or something similar.
Would like someone to review and critique and help with the C rate.
Thanks
Six
Currently designing a 24v system and like someone to look over my design and help with a charging rate question.
Our estimated usage is 2000 watts per day (some estimated, some killawatt measured). So here's the design and math.
Usage: 2000w
Inverter efficiency: .8
Total Load: 2500
Sun hours: 3.9 (south carolina)
fudge factor 1.5
Total panel wattage: 1000
Charge controller output 41.67 amps
Battery V: 6v
Capacity: 215 - golf cart
DoD: 25% <-- origin of C rate question. 20% throws me off
Bank size: 430ah (series/parallel strings) with a C rate of 10.32 - 25% DoD
Bank size: 645ah (series/parallel strings) with a C rate of 15.48 - 20% DoD
I know consulting the manufacturer is recommended but from everything I've read C/10 looks to be a safe bet. Would C/16 reduce battery life or be ill advised?
I already have some panels and the charge controller from a ham radio project no longer in use so would like to use some of what I have so here's the proposed gear:
10 grape solar 100w panels
45a MPPT charge controller
12 batteries (20% DoD) or 8 batteries (25% DoD)
Inverter to be decided - but will go with a big low frequency inverter like a MagnaSine or something similar.
Would like someone to review and critique and help with the C rate.
Thanks
Six
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