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Compare solar surplus with evening energy bought from the grid, check the inverter architecture and estimate what capacity could be used realistically. The result is transparent and indicative, not a promise of savings.
System data
What do you want to achieve?
Tariffs and investment are editable values. The calculator does not assume contractual prices and does not replace a quotation.
Indicative result
Comfort and continuity are not included in the calculated savings. Assess critical circuits and autonomy separately.
The inverter label, manual and installation diagram are needed before choosing a battery.
Indicative capacity
10 kWh
9 kWh usable in this scenario
Evening consumption covered
73.6%
162 kWh/month delivered after losses
Annual savings
1,166 RON-1,555 RON
Conservative indicative range
Indicative payback
22.5-30 years
10-year threshold: 11,664 RON
Fit
Good energy fit
The assessed battery can use approximately 78.4% of its theoretical monthly capacity, based on the declared surplus.
What the calculation means
The estimate moves declared solar surplus to evening consumption, applies 90% usable capacity, 90% round-trip efficiency and a conservative seasonality margin. It does not include contractual degradation, financing, tariff changes or the value of backup comfort.
Technical assessment
Send the result together with the inverter label, distribution-board photos and a prosumer bill. We confirm what can stay, what needs to change and whether backup is technically realistic.
We check the battery family, voltage, communication and inverter limits.
Backup is sized around real circuits and loads, not battery capacity alone.
We separate the battery, automation, protection, installation and retrofit work.
Limits of the result
No. It classifies the declared architecture and shows what must be checked. Exact compatibility depends on the model, firmware, BMS protocol, voltage, power and installation diagram.
No. This is an indicative estimate based on surplus, evening consumption, entered tariffs and technical losses. Seasonality, degradation, finance and tariff changes can alter the result.
No. Backup requires a compatible inverter and automation, selected critical circuits, protection and a check of simultaneous loads.