Inverter And Charging Inputs Explained
This section is where the scenario stops being just a battery number. It tells GridGap how stored energy becomes usable AC power and how the battery is expected to recover afterwards.
What this section covers
The battery may have enough stored energy on paper, but that is not enough on its own. The system still needs an inverter that can support the AC load and a charging setup that can restore the battery in a realistic window.
These fields apply to AC inverter paths. DC distribution scenarios use a separate DC distribution and DC charging input set. Mixed AC/DC scenarios can use both.
Some of these fields are visible in both Simple and Technical mode. Others only appear in Technical mode because they are really about refinement rather than basic setup.
Inverter fields
Inverter / system voltage is one of the most important compatibility fields in the app. The inverter voltage must be equal to or higher than, and should be a multiple of, the battery voltage. For example, a 48 V inverter can work with 12 V, 24 V, or 48 V battery units arranged correctly.
In practical terms, this field tells GridGap what finished DC system voltage the inverter expects from the battery bank. That is why the battery and inverter sections should be checked together, not treated as separate decisions.
Inverter efficiency (%) tells the app how much battery-side power becomes useful AC output. If you do not yet know the exact inverter, 90% is a sensible working starting point.
Real inverters lose energy in conversion. Lower efficiency means the battery has to work harder for the same AC output. Higher efficiency reduces that penalty.
Charging fields
Grid charge hours tells GridGap how many hours are available to recharge the batteries from grid power. If power is available for 6 hours between outages, you would enter 6.
This sounds like a simple field, but it can change the charging result sharply. A battery bank that looks sensible in energy terms can still become awkward if the available recharge window is short.
In off-grid backup, RV, or boat-style use, many users read this as the available utility or shore-power charging window. The point is the same. The app needs to know how much time the charger has to restore the battery.
Technical controls
In Technical mode, the section becomes more explicit. Grid AC voltage lets you enter the actual AC supply voltage, such as 240, 230, or 110. This grounds the charging and AC-side assumptions in the real supply context.
Inverter headroom factor adds margin above the running load when GridGap recommends inverter size. A value of 1.25 means 25% headroom. This field is about caution and breathing room rather than changing the load itself.
Charger efficiency (%) tells the app how much of the incoming charging power actually reaches the battery. A value around 90% is a common working example. Lower efficiency tends to push charger size upward because more input power is lost before it becomes stored energy.
These technical controls are useful when you want the app to reflect a specific system more closely. They are not something you need to fill in just because they are visible.
Installation and planning fields
If you enable Installation & Protection, the inverter and AC side move into a broader planning context. This layer covers practical fields such as AC output cable runs, cable material, cable type, voltage-drop allowance, installation environment, and protection preferences.
Those fields do not replace final design work. They support the advisory installation guidance in the results and help you judge whether a system that looks fine in pure sizing terms still makes sense once real installation conditions are considered.
It often makes sense to settle the core inverter and charging assumptions first. Then use the installation layer as a second pass once the wider system is taking shape.