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eamon avatar image

MPPT 100/20-48V maximum load current 100mA???

I am looking at using the MPPT 100/20-48V but I noticed that the manual specifies a maximum load current of 100mA for a battery voltage of 36-48V. For 12V and 24V it is 20A.

I cannot imagine why there would be such a difference, and how the unit can be useful at 36V or 48V, with only 100mA of available load current. Unless you are simply not supposed to use the load output in this mode.

Can anyone shed some light on this question?

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4 Answers
jamesinwa avatar image
jamesinwa answered ·

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jamesinwa answered · 1 hour ago


I have also wondered about the above regards the output at 48v.

Kirby if using a relay would this then enable a load to be used from the unit at at 48v?

If so what would be the load limit?


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jamesinwa avatar image
jamesinwa answered ·

I have also wondered about the above regards the output at 48v.

Kirby if using a relay would this then enable a load to be used from the unit at at 48v?

If so what would be the load limit?

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PS Would said load if possible be governed by the same protocols as 12v and 24v as in cut off and reconnect voltage and load disconnect on overload?

markus avatar image
markus answered ·

Ah, thanks again @WKirby, I wanted to use the output on this controller for lights, in the "technics shed", and planned to use 4, 5W 12V Bulbs in series. OK, i can cancel this thoughts.


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wkirby answered ·

From what I understand the load output on the 48V version is supposed to drive a relay. It's not a true metered load output like it's lower Voltage siblings.
I guess the thinking is that there are not so many loads to drive that are rated at 48V.
It's probably the only 48V capable model that actually has a "load" output. The higher power ones don't have the load output at all.

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The manual shows 20A for the 48V version when running up to 24V, and 0.1A when running above 24V. So the 48V model contains a switch that's good up to 20A.

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