Sizing Guide Off-Grid Systems

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Step 1	Estimate Your AC Power and Energy Needs (watt/hours per week)
AC loads to be used via inverter	Watt	x	Hours Used Per Week	=	Watt/ Hours Per Week
		x		=
		x		=
		x		=
		x		=
		x		=

			Total watt/hours week	=
			Watts/hour per day	=

Step 2	Estimate Your DC Power and Energy Needs (watt/hours per week)
DC loads to be used via inverter	Watt	x	Hours Used Per Week	=	Watt/ Hours Per Week
		x		=
		x		=
		x		=
		x		=
		x		=

			Total watt/hours week
			Total watt/ hours per day

Step 3	Estimate the total AC energy Watt/hours per week
Total energy (with power factor)	Wh/week
DC input voltage
Capacity (Ah in DC)	Ah/week

Step 4	Estimate the total DC energy Watt/hours per week
Total energy	Wh/week
DC input voltage	V
Capacity (Ah in DC)	Ah/week

Step 5	Estimate the total AC and DC
Total Watt/hours per week	Wh/week
Total Watt/hours per day	Wh/day

Step 6	Calculate the total number of PV modules
Effeciency of charge controller			Between 80% and 90%
Average sun hours per day			Consult the solar map
Power peak of solar module			Choose a module's power (Example 130 W)
Total Array Power	W
Number of solar modules	Modules
Number of modules in series			See Table 1 (For example write 2 if the module is 12 V and the DC input voltage is 24 V)
Number of modules in parallel	Modules

Step 7	Calculate the current of the charge controller PWM
Batteries compensation	Ah
Nominal charging voltage			See Table 2
Current of the charge controller	A

Step 8	Calculate the modules with the MPPT
Efficiency of MPPT			Between 97% to 99%
Nominal charging voltage			See Table 2
Power peak of solar module
Total array power with MPPT	W
Number of modules	Modules
Number of modules in series			See Table 3
Number of modules in parallel
Current of the MPPT	A
Choice of MPPT	A		See Table 4
Number of MPPT			Charge controllers
*Note: The DC input voltage at the MPPT must be higher or equal to system voltage of battery*

Step 9	Calculate the capacity of batteries (ampere/hours)
Number of days without sun
Depth of discharge			Between 20% to 80%
Capacity of the battery	Ah
Multiplicator			See Table 5
Total capacity of battery in Ah	Ah
Amp-hours of the battery			See the specs of the batteries
Number of batteries in parallel	Batteries
System voltage	V		System voltage is equal to DC input voltage
Voltage of one battery	V
Number of batteries in series	Batteries
Total number of batteries	Batteries

Step 10	Estimate the power of the inverter
Power rating of the inverter	W
DC input voltage	V
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Sizing Guide Off-Grid Systems