Solar battery calculator
I-size ang home battery para sa solar evening load.
Reads AS/NZS 5139:2019. Tables checked 2 Oct 2026.
Subukan ang isang job 6
Nilalagyan ng halimbawang value ang bawat job. Palitan ang mga ito ng sarili mong value.
- Size a solar battery for a family homeThe kWh a 25 kWh a day home needs to run its evenings on an 8 kW array.
- Check where a home battery can goThe AS/NZS 5139 rules for a battery on a garage wall backing onto a bedroom.
- Size a battery for the evening peakThe kWh to carry 60 % of 22 kWh a day into the evening.
- Size a battery for 6.6 kW of solarThe battery for a 6.6 kW array and a home using 18 kWh a day.
- Size a battery for a day of backupThe battery for one day of backup with a 5 kW peak.
- Size a battery in 5 kWh modulesThe number of 5 kWh modules a home using 24 kWh a day needs.
Mga input
Worked example gamit ang mga default na input.
- Pang-araw-araw na gamit
- 20 kWh
- Bahagi sa gabi
- 60 %
- Mga araw ng autonomy
- 1
- Peak load sa baterya
- 5 kW
- Laki ng PV
- 6.6 kW
- Ani ng PV kada araw
- 3.5 kWh/kW
- Magagamit na depth of discharge
- 90 %
- Round-trip efficiency
- 90 %
- Laki ng module
- 5 kWh
- Location
- Garahe
- Sa pader papunta sa tirahang kuwarto
- Hindi
Magagamit na capacity
12.65kWh
- Nominal capacity
- 14.05kWh
- Iminumungkahing bank
- 3 × 5kWh
- Inverter, tuloy-tuloy
- 5kW
- Sobrang PV kada araw
- 15.1kWh
Design aid lang ang resultang ito. I-verify ito laban sa kasalukuyang standard.
Mga hakbang ng kalkulasyon
- Paggamit sa gabi12kWh
- Energy na ihahatid12kWh
- Discharge efficiency (square root ng round-trip)×0.95
- Magagamit na kapasidadResulta12.65kWh
- Nominal capacity sa depth of discharge14.05kWh
- Iminumungkahing bank
3 × 5 kWh
- Tuloy-tuloy na rating ng inverter5kW
- Enerhiya ng PV bawat araw23.1kWh
- Sobrang PV pagkatapos ng gamit sa araw15.1kWh
- Energy para punuan ang bahaging pang-gabi13.33kWh
Tungkol sa calculator na ito
How this is calculated
The tool sizes a home battery in kWh from your daily use and your solar array. It also gives the inverter rating and points at AS/NZS 5139.
- Evening use. It takes your evening share of the daily use.
- Energy to deliver. It multiplies that by the days of autonomy.
- Efficiency. It divides by the square root of the round-trip efficiency. That is the discharge efficiency.
- Usable capacity. The result is the usable capacity in kWh.
- Nominal capacity. It divides the usable capacity by the depth of discharge.
- Suggested bank. It rounds up to whole modules of the size you enter.
- PV surplus. It finds the daily PV energy, then subtracts the daytime use. The tool checks that the surplus fills the evening share.
Worked example
- 20 kWh a day, 60 % in the evening, 6.6 kW of PV. The usable capacity is 12.65 kWh. The nominal capacity is 14.05 kWh. The bank is 3 × 5 kWh. The inverter is 5 kW continuous. The PV surplus is 15.1 kWh a day.
Limits
The location rules apply to a pre-assembled integrated BESS. They are in AS/NZS 5139:2019 Cl 4.2.2.2 and Cl 4.2.5. The tool does not hold Amendment 1 (2025). It does not size the DC or AC cable. It does not model tariffs.
Check the usable capacity against the battery data sheet. The nominal capacity is larger, because the battery cannot use all of its charge. The suggested bank is a number of equal modules. Round to the modules the maker sells. Check the inverter against the maximum demand of the home.
See also: Home batteries and AS/NZS 5139, Solar battery size for a family home and PV string sizing.
Mga tanong
Design aid ang resulta. I-verify ito laban sa kasalukuyang standard.
Gaano kalaking solar battery ang kailangan ko?
I-size ito ayon sa enerhiyang ginagamit mo pagkatapos ng lubog ng araw. Kinukuha ng tool ang araw-araw mong gamit at ang bahagi sa gabi, pagkatapos ay idinadagdag ang losses. Hinahati ito sa magagamit na depth of discharge para makuha ang nominal size sa data sheet.
Ano ang pagkakaiba ng usable at nominal kWh?
Ang nominal kWh ay ang buong chemical capacity. Ang usable kWh ay ang kayang kunin ng battery bago ito huminto, na itinatakda ng depth of discharge. Ang 10 kWh battery sa 90 % ay nagbibigay ng 9 kWh usable.
Mapupuno ba ng solar panel ko ang battery?
Ini-multiply ng tool ang PV size sa daily yield, pagkatapos ibinabawas ang daytime use mo. Kapag mas mababa ang surplus kaysa sa evening share at losses, babalaan ka nito. Mas mababa ang winter yield kaysa sa yearly average.
Saan puwedeng ilagay ang home battery?
Inilalayo ng AS/NZS 5139:2019 ang all-in-one home battery sa habitable rooms, ceiling spaces, wall cavities, sa ilalim ng hagdan at escape routes. Nagtatakda rin ito ng clearances mula sa exits, bintana at iba pang appliances. Inililista ng tool ang rules para sa lokasyong pipiliin mo.
Ano ang pagkakaiba nito sa battery bank tool?
Ang battery bank tool ay nagsa-size ng off-grid o backup bank sa Ah sa itinakdang voltage mula sa listahan ng load. Ang tool na ito ay nagsa-size ng grid-tied home battery sa kWh mula sa bill at solar mo.
Mga worked example
- Arc flash at a 48 V home batteryClass a 48 V lithium home battery with 6 kA at its terminals by AS/NZS 5139, find its arc flash energy and PPE level, then bring it down with fuses.
- Where can a home battery go? Garage wallsA garage wall that backs onto a bedroom, with a hot water cylinder nearby. See which AS/NZS 5139 location rules fail for a home battery, then fix each one.
- Solar battery size for a family home: 25 kWh a daySize a solar battery for a home that uses 25 kWh a day with an 8 kW array. Usable and nominal kWh, the bank, the inverter, winter solar and where it can go.
Background
- Home batteries and AS/NZS 5139How a home solar battery is sized in kWh, what usable, nominal, depth of discharge and round-trip efficiency mean, and where AS/NZS 5139 lets one go.
- Home battery location and clearancesWhere AS/NZS 5139 lets an all-in-one home battery go. Restricted places, 600 and 900 mm zones, the habitable room barrier, ceiling, IP codes and working space.
- Battery classes and arc flash in AS/NZS 5139How AS/NZS 5139 classes a battery system by hazard and decisive voltage class, works its arc flash energy, and sets the PPE, consequence and home limits.
Mga clause at table na binabasa ng tool na ito
- AS/NZS 5139:2019 Cl 4.2.2.2Restricted locations for a home battery
- AS/NZS 5139:2019 Cl 4.2.3.2IP rating of a home battery
- AS/NZS 5139:2019 Cl 4.2.4.2Barrier to a habitable room
- AS/NZS 5139:2019 Cl 4.2.5Working space at a home battery
- AS/NZS 5139:2019 Cl 4.2.2 to 4.2.5Location, clearance and barrier rules for a pre-assembled integrated BESS
- AS/NZS 5139:2019 Cl 7.3 to 7.19Battery signs and where each one goes
Bawat clause at table, kasama kung paano ito na-verify
Huling na-check ang mga table noong 2 Oct 2026.
Mga kaugnay na tool
- Battery bank calculatorCalculate battery bank capacity and autonomy for a load.Walang standard
- DC cable size calculatorSize a d.c. cable up to 1500 V for current and voltage drop.AS/NZS 3008.1.1
- Total voltage drop calculatorAdd the drop of mains, submain and final against 5 %.AS/NZS 3000AS/NZS 3008.1.2AS/NZS 3008.1.1
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