How many solar panels can Delta 3 or Delta 3 Plus use, and what is the solar charging power?

Question

Accepted Answer

"It is necessary to confirm the parameters and combination of the connected solar panels, and determine that the maximum power of the solar panel can be used within the specifications of the transfer storage. If it exceeds the range, it will cause damage to the transfer storage and cannot be used.
First, check the user manual to learn the specifications of the solar energy input of the transfer storage, including ① voltage range, ② maximum current, and ③ maximum power.
The solar panel combination method must meet the following conditions:
1. Voltage: The open-circuit voltage of the solar panel needs to be within the voltage range of the transfer storage ①.
2. Current: The maximum current of the solar panel is less than or equal to the maximum current of the storage device.
3. Power: The maximum power of the solar panel is less than or equal to the maximum power of the storage unit.
Three conditions must be met simultaneously. If there is more than one, it cannot be used.
Combination method:
There are two ways: series connection and parallel connection.
Series connection, normal voltage superposition, current limited by the smallest plate.
Parallel connection, normal current superposition, voltage is limited by the smallest plate.
If the transfer storage has overcurrent protection function, the current will be limited to the maximum current of the transfer storage for input.
For example, can Delta 3 be connected to two 400W solar panels of EcoFlow?
First, check the Delta 3 and solar panel user manual to learn:
Delta 3's solar input specifications: voltage range 11-60V, maximum current 15A, maximum power 500W.
Open circuit voltage of solar panel: 37.1V, maximum operating current: 12.9A.
[Series use] Open circuit voltage: 37.1x2 = 74.2V; current: 12.9A; power: 74.2 × 12.9 = 957.18W > 500W. If the power exceeds the specifications of the storage input, it cannot be used.
[Parallel use] Open circuit voltage: 37.1V; current: 12.9x2 = 25.8A > 15A; current exceeds the input specification of the storage device and cannot be used."

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