How Battery Sizing Works In GridGap

This tab answers a blunt question: how much battery does the scenario really need once the energy burden is turned into a bank you could actually build.

What the Battery tab is showing

Read the tab in two passes. First, look at how much energy the battery must supply. Then look at how that requirement becomes a real bank once voltage, depth of discharge, and rounding are taken into account.

That is why the final answer is often larger than a quick manual estimate. The app is not chasing a perfect theoretical number. It is trying to land on a workable battery arrangement.

Input reminder cards

The first cards confirm the battery basis used in the scenario. Battery Unit kWh / Ah shows the unit size. Battery Entry shows whether that unit was entered in kWh or Ah. Battery Voltage shows the unit voltage used in the scenario.

If the result looks odd, check these cards first. Quite a few surprises start with a battery entry that was not what the user thought it was.

Requirement build-up

The core of the tab is the requirement chain. It starts with Battery output required, which is the energy the battery actually has to deliver for the scenario.

After that you get the build-up: Nominal capacity required, Temperature adjusted capacity, Peukert factor, and Final required battery capacity.

Read those in order. They explain why the final battery answer is not just the load number copied into a bank.

Required system Ah converts that final requirement into amp-hours at system level. That is useful because many real battery choices still end up being judged in Ah terms even when the thinking started in Wh or kWh.

Bank layout and actual installed capacity

Once the required capacity is known, the result moves from theory to physical arrangement. Series count tells you how many battery units are needed in series to reach the system voltage. Parallel strings shows how many parallel paths are needed to reach the capacity target.

Total batteries is the rounded physical battery count that falls out of that arrangement. This is often the first number users focus on, but it makes more sense when read together with the series and parallel layout behind it.

Actual installed capacity shows what the rounded bank really provides once whole batteries and practical stringing are taken into account. Actual usable capacity shows how much of that bank is realistically usable under the selected discharge assumptions.

On its own, total battery count is not enough. Read it with the series and parallel layout and with the actual installed and usable capacity values.

Reserve, depletion, and margin

The last part of the Battery tab is about comfort margin. Depletion percent shows how hard the modeled scenario pushes the bank. Higher depletion means the bank is being used more deeply relative to its usable capacity.

Reserve Wh and percent show what remains after the scenario demand has been applied. A result can be mathematically valid and still feel tight if reserve is thin.

That does not automatically make the result wrong, but it does tell you the battery side is closer to the edge than it might first appear.