The HEPWAY ESS mass storage system is based on a Master/Slave configuration. This eliminates the weed for wiring at the time of installation and since slaves are always cheaper than Masters, total system cost is lower
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Product Description
The HEPWAY ESS mass storage system is based on a Master/Slave configuration. This eliminates the weed for wiring at the time of installation and since slaves are always cheaper than Masters, total system cost is lower.
Solar Water Heater 12v Controller for inverter 
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