We have a 1500v DC solar array, so ~ 650 amp incoming. This is within the inverters input voltage range.
If there is a single input (not multiple strings) what happens? Especially to the MPPT algorithm?
Can you operate a grid-forming inverter of this type without a battery?
Thanks!
Hi Sara,
Just to mention, this isn’t my main field of expertise, but here’s what I understand. The MPPT algorithm will still function with a single input, but without multiple strings there’s no balancing, so the process is simpler. If shading or mismatch occurs, you lose flexibility because you can’t isolate or optimise separate strings, so while it works, you miss out on the benefits of multiple MPPT channels in more complex arrays.
Regarding grid-forming inverters without a battery, these normally need a stable energy source to maintain voltage and frequency reference. Batteries are common because they provide fast response and stabilisation. Without a battery, it’s technically possible if the inverter can use the solar array as the source, but solar is variable and can’t always respond quickly to load changes. Most manufacturers recommend at least a small battery or another stabilising source, such as a generator, for proper grid-forming behaviour. In short, operating without a battery is risky unless the inverter is specifically designed for PV-only grid-forming and the load is very predictable.
If I'm wrong on any of this please point it out as I'm always learning 
Hi Sara,
Just to mention, this isn’t my main field of expertise, but here’s what I understand. The MPPT algorithm will still function with a single input, but without multiple strings there’s no balancing, so the process is simpler. If shading or mismatch occurs, you lose flexibility because you can’t isolate or optimise separate strings, so while it works, you miss out on the benefits of multiple MPPT channels in more complex arrays.
Regarding grid-forming inverters without a battery, these normally need a stable energy source to maintain voltage and frequency reference. Batteries are common because they provide fast response and stabilisation. Without a battery, it’s technically possible if the inverter can use the solar array as the source, but solar is variable and can’t always respond quickly to load changes. Most manufacturers recommend at least a small battery or another stabilising source, such as a generator, for proper grid-forming behaviour. In short, operating without a battery is risky unless the inverter is specifically designed for PV-only grid-forming and the load is very predictable.
If I'm wrong on any of this please point it out as I'm always learning
