MPPT Controllers
As I continue the learning curve, I'm finding the answers I get always lead to 2 more questions... funny how that is... I've been working backwards in developing my solar needs, going from panels t...
Forum Discussion
StirCrazy wrote:
take the sizing rules with a grain of salt.
Panel sizing for lead acid jars based on acceptance rates at 85% state of charge is about 12.5 amps per 100 amp-hours of storage capacity, or about 150 watts. Since there is a need to equalize the bare minimum is about 60 watts of panel per 100 amp-hours.
It is a bit better with AGM--90% SOC. Equalizing not recommended but "recovery" charging is sometimes needed. I would not design a system for recovery charging--but would do that "deed" on shore power.
With the extremely low impedance of Li chemistries there is not much need to limit sizing.
Li are crazy in that lifespan is reduced if you take them to 100% soc--better to just take them to 90%. They do sometimes need to be "woken up" with high rate charging. Again I would do that on shore power.
SiO2 also need a 'wake up' charge from time to time.
