SmartSolar MPPT 100/20 & external battery charger

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David Lowrey asked Jan 13, '19

SmartSolar MPPT 100/20 & external battery charger

I have a SmartSolar MPPT 100/20 charge controller. I also want to use a shore power connected battery charger that will charge the batteries when my RV is plugged in.

I need to know which side of the SmartSolar controller the 12V leads from the external charger are connected to: the LOAD side or the BATTERY?

Thanks!

MPPT Controllers

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markus answered · Jan 13, 2019 at 03:36 PM

Hi,

connect your MPPT charger and your external charger in parallel to the battery.

Regards,

Markus

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Answer 1 · 2019-01-13T15:45:57Z

David Lowrey answered · Jan 13, 2019 at 03:45 PM

The is what I thought, but wanted to be sure.

Thanks!

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Answer 2 · 2021-11-17T17:14:03Z

hardstuff answered · Nov 17, 2021 at 05:14 PM

Can external charger be bigger than 20 amps ? Fusing is 20...

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Answer 3 · 2021-11-18T07:36:57Z

ningaloo answered · Nov 18, 2021 at 07:36 AM

Just to be clear the external battery charger should be connected direct to the battery terminals / busbar and not to the mppt controller itself.

Your mppt controller is limited to 20a but you can use a larger external charger which should have its own fuse.

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