We round down to a max string size of 17 panels. Max string size: 25 optimizers or 6,000 watts (whichever is smaller)ĭivide the panel wattage by the maximum string input to ballpark your maximum string size:.Minimum string length: (8) P370 or P400 optimizers.Go back to the optimizer spec sheet and scroll down to the bottom where it covers system design: SolarEdge system design specsīased on our single-phase HD-wave 7600 inverter and P400 optimizer, we can now determine minimum and maximum string size: Next, we need to figure out our string size-the number of panels that can be wired into a single input on the inverter. With those values covered, we know we can safely pair either the P370 or P400 with Astronergy’s 345W panels. The P370 satisfies these benchmarks as well. The P400’s 80V max input voltage covers the 46.37V open-circuit voltage of the panel, and its 10.1A short circuit current is enough to handle the 9.67A current from the panel. The P370 and P400 both have a high enough DC input rating to cover the 345W output of the solar panel. Let’s start by looking at the spec sheet for the standard optimizers: Input ratings for SolarEdge power optimizersĬompare the optimizer input requirements to the solar panel’s spec sheet to make sure the voltage and current are within spec: Astronergy solar panel specs These optimizer models work with SolarEdge inverters: Picking the right optimizer is fairly easy when you look at the input section on the optimizer spec sheet. Step 2: Pick an optimizer for your inverter Now that we know which inverter we’ll be using, we can pair the appropriate optimizer. In this case, I would suggest the SE7600H unless you plan to expand your system down the road. Oversizing your PV array will better utilize that inverter, resulting in lower system costs with similar production. The array is usually not producing at max power due to real-world losses caused by cloud cover, high temperatures, and module soiling. It’s fairly common for your solar array DC wattage to be greater than the inverter output. The SolarEdge SE7600 outputs 7,600 watts, but can safely handle 11,800 watts of input from the array. Note that inverters have different input and output ratings. On the other hand, the SE10000H would allow some room for future expansion. The SE7600 would be easier to install, because it can go on a standard 200 amp service panel without derating the main breaker or doing a line side connection. In this case, the SE7600H and SE10000H inverters both appear to be a good fit as they can both handle the input from our 10.35kW array. Max DC Power ratings for SolarEdge inverters We choose 240V because that is the standard voltage on most electrical service panels installed on residential properties. To determine which inverters are suitable, check the inverter spec sheet for the maximum DC power 240V for each model. Once we know our desired array size, we need to pick an inverter that is large enough to handle the input from the array. The array size is 10,350 watts or 10.35 kW: In our example, we’re going to design for an array with 30 Astronergy 345W solar panels. Step 1: Match DC Array Size to Inverter Input Size
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