Quite breezy!
Load 140w
Usage1 7hrs
Usage2 10hrs
Energy1 =140*7=0.98kWh
Energy2=140*10=1.4kWh
1.Budget constrained:
Battery1=0.98/12=81.6=~83Ah
Battery2=1.4/12=116.6=~120Ah
Gel, AGM
Charger1=83*0.25=20.75*14.8=307.1w~350w
Charger2=120*0.25=30*14.8=444w=~500w
Inverter=140/0.8=200W
2.Optimal performance:
Accounting system efficiency
Energy1=0.98/0.9=1.088kWh
Energy2=1.4/0.9=1.555kWh
Accounting battery discharge level (Lead DoD)
Energy1/=1.088/0.5=2.176kWh
Energy2=1.555/0.5=3.111kWh
Battery1=2.176/12=181Ah=~200Ah
Battery2=3.111/12=259Ah=~250Ah
Gel, AGM
Charger1=200*0.25=50A*14.8=740w=~800w
Charger2=250*0.25=62.5A*14.8=925w=~1000w
Inverter =140/0.8/0.9=200w