Installation Manual

Copyright 2020 Ampt, LLC.
All rights reserved.
PRELIMINARY
14
String Optimizer V1500-30 Series
Installation Manual: 57070016-1
v20201023
Acceptable Input Configurations
Each input of the optimizer can have multiple PV strings of the same length in parallel. Each
PV string in parallel, on a given input, should have the same open-circuit voltage (V
oc-cold
).
Figure 6: Example - Two strings in parallel on each input
Figure 7: Example - Three strings in parallel on each input
When the number of modules on each input is not the same, the input with the highest
power should be connected to input 1.
Figure 8: Strings with the highest power should be connected to Input 1
Optimizer Input Requirements
Inputs 1 and 2 of the String Optimizer have the following requirements for the optimizer to
operate at maximum power point (MPP):
• V
oc-cold-in1
≤ Optimizer’s Maximum voltage per input
• V
oc-cold-in1
≤ Inverter maximum input voltage
• V
mp-hot-in1
> (V
out
÷ 2)
• V
mp-hot-in2
> (V
out
÷ 2)
• V
mp-cold-in1
< V
out
• V
mp-cold-in2
< V
out
• V
oc-cold-in1
≥ V
oc-cold-in2
• (P
in1
÷ 2) < P
in2
≤ P
in1
The input configurations of different optimizers within the same PV array can vary so long
as they meet the defined criteria.
Note:
For inputs with a single string, like Input 2 shown
here, a fuse may or may not be needed to
protect the modules in case of an array fault.
See Fuses section for more information.
Same Voc-cold
Same
Voc-cold
V
out
= voltage at the output of the optimizer, which includes the
voltage set by the inverter (or battery converter) plus line losses