General / sales Find your sales manager +31 (0)36 5359700 Multiply the reserve minutes rating of the battery by 0.3 to determine the battery approximate Ah rating. Use the total wattage, then add 10% to 20%, as your minimum power requirement. 1 watt is approximately 3.412 BTU per hour. Think of this as the minimum battery bank size based on your typical usage. As an example, let's say that you want to plug in your laptop, a light bulb, a television, and still be able to run your printer. The array size is 10,350 watts or 10.35 kW: 30 x 345 = 10,350 watts. Inverters consume power as they convert DC power to AC power, and in doing so, contribute to the system load. In our example, we’re going to design for an array with 30 Astronergy 345W solar panels. How to choose the right solar inverter size for your solar power system. STIKopedia reflects that and is updated continuously as the industry grows and evolves. 2 - Enter nominal system voltage [or pv array voltage for solar cables]. Once you've figured out what devices you want to plug into your inverter, you can dig right in and figure out the right size inverter to buy. Calculate Size of Inverter for following Electrical Load .Calculate Size of Battery Bank and decide Connection of Battery. Check theinverter and battery price list before choosing a large or small inverter battery according to your specific needs. Power equipment and appliances which operate with motors or tubes require an initial surge of power to get them up and running. According to NEC (National Electric Code), IEC (International Electrotechnical Commission) and IEEE (Institute of Electrical and Electronics Engineers), a proper size of circuit breaker is must for all electrical circuits i.e. is compatible with a modified sine wave. It’s about the number of wattages it a given inverter outputs. The less power an inverter consumes the more efficient it is, which is how its efficiency rating is determined. Surge is the maximum power that the inverter can supply, usually for only a short time (usually no longer than a second unless specified in the inverter’s specifications). Comments? When using an inverter in a portable, battery-based electrical circuit, it is recommended the inverter has a power rating of 125% of the total load. Fill out our calculator at the top of the page and it will provide a recommended fuse size based on your inputs. Proper battery capacity in an electrical circuit enables you to supply the total power required by the load in a system, fully recharge the battery bank from the chosen power generation source or sources on a regular interval, and ensure there is enough energy to power the load between charges. Tweets by @SolarStik Let’s assume that an inverter has an efficiency rating of 80%. What is a BTU? Note: this sizing advice relates to portable generators – if you are after generator sizing advice for a large stationary generator, then you may need to engage an electrician.. To begin, you need to know the wattage draw of your appliance(s) and make sure your generator produces enough power to handle that draw – lets’ do it;. The inverter size you choose depends on the power in watts (or current in amps) of the appliance/equipment you want to run (find the power consumption by referring to the specification plate on the appliance or tool or you will find the information in the appliance manual. Inverter / Battery Detail: Additional Further Load Expansion (Af)=20% Efficiency of Inverter… If you only use one device at a time, you need the recommended minimum size inverter. This power surge is referred to as the "starting load" or "peak load." 1 BTU = 1,055 joules, 252 calories, 0.293 watt-hour or the energy released by burning one match. 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