Shunt before or after the cutoff switch?

[ZoNiE]

Hey Solarites, I'm finalizing the design on my system, and I have a question. I Will be using a shunt and a WhizBang Jr. Do I put the shunt on the Line (battery) side of the main battery switch of Load side? The purpose of shutting off the battery bank is to totally isolate it for service. I can see benefits of each.

[ILFE]

Hey Solarites, I'm finalizing the design on my system, and I have a question. I Will be using a shunt and a WhizBang Jr. Do I put the shunt on the Line (battery) side of the main battery switch of Load side? The purpose of shutting off the battery bank is to totally isolate it for service. I can see benefits of each.

A main cut off switch would be on the positive side of the battery bank. The shunt should be installed on the negative side.

Are you considering installing a disconnect switch on both the positive and negative sides of your battery bank?

[ZoNiE]

Right you are. I didn't realize that they went on the neg side (I don't have the hardware yet). I'm used to using them on machinery to monitor motor current, and we put them on the Positive output of the controller.

Only putting a switch on Pos.

Answers that question.

[ILFE]

The shunt will have both definitive load and battery sides as well. Keep that in mind when connecting it.

It's better to ask the question first, rather than to possibly do damage to your system later, and then ask.

[ILFE]

If you haven't received your WBjr, here is some documentation that you may be interested in reading.

Wizbang Jr. Manual

[ZoNiE]

If you haven't received your WBjr, here is some documentation that you may be interested in reading.

Wizbang Jr. Manual

thx

[mapmaker]

I didn't realize that they went on the neg side (I don't have the hardware yet). I'm used to using them on machinery to monitor motor current, and we put them on the Positive output of the controller.

The reason is very simple... if you put the shunt on the negative, the whizbangjr does not need to be protected by a fuse or circuit breaker.

--mapmaker