Amp-hours become meaningful when the voltage is known. Within a 51.2 V family, 100 Ah, 200 Ah and 300 Ah correspond to 5.12, 10.24 and 15.36 kWh nominal energy.
Compare energy at the same voltage
Doubling Ah at the same nominal voltage doubles nominal energy. Comparing Ah across different voltages does not give a fair capacity comparison. Write both values on the purchasing worksheet.
Do not infer current capability
A larger Ah rating does not automatically establish a larger BMS current rating. The enclosure, cells, wiring, BMS and cooling determine the approved continuous and peak current. Request those values separately.
Choose from the load schedule
A compact 100 Ah unit may suit modest essential loads; 200 Ah provides more evening energy; 300 Ah may better match longer backup. These are selection directions, not runtime promises. Convert the household load list into AC kWh, then review reserve and conversion losses.
Details to confirm
- Nominal voltage and capacity
- Usable operating window
- Continuous discharge and peak duration
- Weight, enclosure and expansion options
Can I parallel different Ah sizes?
Only when the manufacturer approves the exact models and configuration. Similar voltage alone is not approval.
Product and project review
See the related Graspmart battery specifications and compare the available capacities. Use the reference data to shortlist a platform, then confirm the exact production model, accessories and operating limits in the quotation.
Send the inverter model, destination, quantity and the requirements listed above through the project enquiry form. Include existing equipment details when the battery is being added to an installed system.
