Solar / electrical
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        Solar upgrade: stage 1- 200W to 400W 
- 400W to 600W 
- 600W to 800W 
 
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        Solar upgrade: stage 2- 200W to 600W 
- 400W to 800W 
 
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        2000W pure sine wave change-over inverter
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        1000W pure sine wave inverter (not change-over)
