Q:Do you have to mount on each module in ? A:No need. Just install that mismatched module which has hot spot, shaded, degradation fast, dusty etc. If 1 MPPT has more than 1 string, some brand optimizer need to be installed all the modules in all the strings. Q:What will happen if we only install optimizer under the mismatch module? A:It will solve the mismatch issue in certain period. The mismatch status is not constant, it will change with the different module degradation level while time lapsing, environment changing etc. The mismatch issue may happen again at other module after a certain time. Referring to the barrel effect, the system will appear heavy power loss. Need to find out the mismatch module to deal with. Q: How many power losses will be saved after installed optimizer? A: Different system has different status, need to test on each individual project.For new and unshaded project, the power generation will 1%-3% due to different brand and model module. By time lapsing, the power generation will be more due to the dust and environment affect. Q: Does it work with all types of inverters? A: Yes; Q: Does it work with all types of modules? A: Yes Q: What's your advantage? A: Current competitor are made by electrical components. Normally has around 150 components in one optimizer. efficiency is 98% above. Big and not cheap. Ours is made by chip, the components are only a few, the convention efficiency is 99.5%. smaller, cheap, flexible. This solar optimizer could work normally with any brand string inverters in the market. It is not for a certain brand, it's universal. This solar optimizer could work with most /mono-crystalline solar modules, but could not work with flexible BIPV panels. 600W optimizer could not work well with the panels made of 210mm cells(cut into 2 pieces) because its current is bigger than optimizer's limit. Please check your panel's cell before buying 600W optimizer. If your panel is made of such cells, please 't use 600W optimizer. Color: As Shown Material: plastic Package Contents: 1 x Photovoltaic intelligent optimizer(600W) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.