Can a DIY system be grid-tied?

Not necessarily. Most utilities require licensed electricians or registered installers to sign off, and DIY projects usually cannot be directly grid-tied.

Can DIY enjoy subsidies and tax incentives?

Eligibility depends on your country and region. Check policies in advance. United States : The federal government offers a 30% solar Investment Tax Credit (ITC), but most states and utilities require systems to be installed by certified installers, otherwise subsidies or grid connection may not be granted. Australia : Systems must be installed by Clean Energy Council (CEC) certified installers using certified components to qualify for STC (Small-scale Technology Certificates) subsidies .

What if the DIY system malfunctions?

Repair costs are borne by yourself. In contrast, professional installers provide warranties and assume responsibility for equipment failures or roof leaks.